☀️ Solar Propagation Widget – User Guide

📋 Quick Start

This widget displays real-time HF propagation conditions for amateur radio operators. Perfect for WWBOTA bunker activations and general HF operating!

📥 Installation

Step 1: Copy the Code

Download solar-widget-wordpress.php
Open your WordPress admin panel
Go to Appearance → Theme File Editor
Select functions.php from the right sidebar
Scroll to the bottom
Paste the entire contents of solar-widget-wordpress.php
Click Update File

✅ That’s it! The widget is now installed and ready to use.

🎯 Using the Widget

Basic Usage

Add this shortcode to any page or post:

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

MUF 500km

5.5

MHz

MUF 1000km

8.4

MHz

MUF 3000km

12.7

MHz

A-INDEX

SOLAR FLUX

167

SUNSPOT #

166

HF BAND CONDITIONS

160m

80m

40m

20m

15m

10m

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

That’s all you need! The widget will appear with default settings.

🎨 Widget Types

You have 3 widget sizes to choose from:

📱 Small Widget

Perfect for sidebars or compact spaces

    
    

    
        
            ☀️ Solar Propagation
            
        
        
        
            
                Kp-INDEX
                
                    2.7                
                
                    QUIET                
            

            
                FoF2 CRITICAL FREQUENCY
                4.2 MHz
                NORTHERN EUROPE
            
        

        
        
            ⚠
            
                
                    C3.1
                    SOLAR FLARE RISK
                
                MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.
            
        

        
        
                
        
            rmi • 5 minutes ago
                         • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Shows:

☀️ Title and UTC Clock
📊 K-Index (geomagnetic activity)
📡 FoF2 Critical Frequency
🌟 Solar Flare Alert

Height: ~220px

📊 General Widget (Default)

Best for main content areas

    
    

    
        
            ☀️ Solar Propagation
            
        
        
        
            
                Kp-INDEX
                
                    2.7                
                
                    QUIET                
            

            
                FoF2 CRITICAL FREQUENCY
                4.2 MHz
                NORTHERN EUROPE
            
        

        
        
            ⚠
            
                
                    C3.1
                    SOLAR FLARE RISK
                
                MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.
            
        

                
            
                MUF 500km
                5.5
                MHz
            
            
                MUF 1000km
                8.4
                MHz
            
            
                MUF 3000km
                12.7
                MHz
            
        

        
            
                A-INDEX
                10
            
            
                SOLAR FLUX
                167
            
            
                SUNSPOT #
                166
            
        

        
            HF BAND CONDITIONS
            
                                    
                        160m                    
                                    
                        80m                    
                                    
                        40m                    
                                    
                        20m                    
                                    
                        15m                    
                                    
                        10m                    
                            
        
        
        
                
        
            rmi • 5 minutes ago
                         • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

As in Small widget, PLUS:

🎯 MUF values (3 distances: 500km, 1000km, 3000km)
☀️ Solar Data (A-Index, Solar Flux, Sunspot Number)
📻 HF Band Conditions (160m through 10m)

Height: ~500px

📈 Full Widget

For dedicated propagation pages

    
    

    
        
            ☀️ Solar Propagation
            
        
        
        
            
                Kp-INDEX
                
                    2.7                
                
                    QUIET                
            

            
                FoF2 CRITICAL FREQUENCY
                4.2 MHz
                NORTHERN EUROPE
            
        

        
        
            ⚠
            
                
                    C3.1
                    SOLAR FLARE RISK
                
                MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.
            
        

                
            
                MUF 500km
                5.5
                MHz
            
            
                MUF 1000km
                8.4
                MHz
            
            
                MUF 3000km
                12.7
                MHz
            
        

        
            
                A-INDEX
                10
            
            
                SOLAR FLUX
                167
            
            
                SUNSPOT #
                166
            
        

        
            HF BAND CONDITIONS
            
                                    
                        160m                    
                                    
                        80m                    
                                    
                        40m                    
                                    
                        20m                    
                                    
                        15m                    
                                    
                        10m                    
                            
        
        
                
        
            
                📊 PROPAGATION DATA
                
                    
                    
                    
                
            
            
            
            
                
                    
                
            

            
            
                
                    
                
            

            
            
                
                
                
                    
                        
                        Reliable NVIS (0-150km)
                    
                    
                        
                        Extended NVIS (150-400km)
                    
                    
                        
                        📍 Your QTH
                    
                
                
                    SELECT BAND:
                    
                    
                    
                
            
        
        
                
                
        
            rmi • 5 minutes ago
                         • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Shows everything in General widget, PLUS:

📊 24-hour K-Index graph
📊 24-hour FoF2 graph

Height: ~850px

🎨 Light Mode

All widget types support Light Mode for sites with white/light backgrounds.

How to Use Light Mode

Just add light to your widget type:

    
    

    
        
            ☀️ Solar Propagation
            
        
        
        
            
                Kp-INDEX
                
                    2.7                
                
                    QUIET                
            

            
                FoF2 CRITICAL FREQUENCY
                4.2 MHz
                NORTHERN EUROPE
            
        

        
        
            ⚠
            
                
                    C3.1
                    SOLAR FLARE RISK
                
                MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.
            
        

        
        
                
        
            rmi • 5 minutes ago
                         • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]                    
    

    
    
    
    
    
    

    
        
            ☀️ Solar Propagation
            
        
        
        
            
                Kp-INDEX
                
                    2.7                
                
                    QUIET                
            

            
                FoF2 CRITICAL FREQUENCY
                4.2 MHz
                NORTHERN EUROPE
            
        

        
        
            ⚠
            
                
                    C3.1
                    SOLAR FLARE RISK
                
                MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.
            
        

                
            
                MUF 500km
                5.5
                MHz
            
            
                MUF 1000km
                8.4
                MHz
            
            
                MUF 3000km
                12.7
                MHz
            
        

        
            
                A-INDEX
                10
            
            
                SOLAR FLUX
                167
            
            
                SUNSPOT #
                166
            
        

        
            HF BAND CONDITIONS
            
                                    
                        160m                    
                                    
                        80m                    
                                    
                        40m                    
                                    
                        20m                    
                                    
                        15m                    
                                    
                        10m                    
                            
        
        
        
                
        
            rmi • 5 minutes ago
                         • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]                    
    

    
    
    
    
    
    

    
        
            ☀️ Solar Propagation
            
        
        
        
            
                Kp-INDEX
                
                    2.7                
                
                    QUIET                
            

            
                FoF2 CRITICAL FREQUENCY
                4.2 MHz
                NORTHERN EUROPE
            
        

        
        
            ⚠
            
                
                    C3.1
                    SOLAR FLARE RISK
                
                MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.
            
        

                
            
                MUF 500km
                5.5
                MHz
            
            
                MUF 1000km
                8.4
                MHz
            
            
                MUF 3000km
                12.7
                MHz
            
        

        
            
                A-INDEX
                10
            
            
                SOLAR FLUX
                167
            
            
                SUNSPOT #
                166
            
        

        
            HF BAND CONDITIONS
            
                                    
                        160m                    
                                    
                        80m                    
                                    
                        40m                    
                                    
                        20m                    
                                    
                        15m                    
                                    
                        10m                    
                            
        
        
                
        
            
                📊 PROPAGATION DATA
                
                    
                    
                    
                
            
            
            
            
                
                    
                
            

            
            
                
                    
                
            

            
            
                
                
                
                    
                        
                        Reliable NVIS (0-150km)
                    
                    
                        
                        Extended NVIS (150-400km)
                    
                    
                        
                        📍 Your QTH
                    
                
                
                    SELECT BAND:
                    
                    
                    
                
            
        
        
                
                
        
            rmi • 5 minutes ago
                         • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Dark vs Light Mode

Dark Mode (Default)	Light Mode
Black/dark gray background	White/light gray background
Bright colored text	Dark text on colored backgrounds
Perfect for dark themes	Perfect for light themes
Example: `☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. MUF 500km 5.5 MHz MUF 1000km 8.4 MHz MUF 3000km 12.7 MHz A-INDEX 10 SOLAR FLUX 167 SUNSPOT # 166 HF BAND CONDITIONS 160m 80m 40m 20m 15m 10m rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`	Example: `☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. MUF 500km 5.5 MHz MUF 1000km 8.4 MHz MUF 3000km 12.7 MHz A-INDEX 10 SOLAR FLUX 167 SUNSPOT # 166 HF BAND CONDITIONS 160m 80m 40m 20m 15m 10m rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`

📊 Understanding the Data

🌐 K-Index (Geomagnetic Activity)

What it means:

0-2 (QUIET): 🟢 Excellent propagation
3-4 (UNSETTLED): 🟡 Good propagation
5-6 (ACTIVE): 🟠 Fair propagation, some disturbances
7-9 (STORM): 🔴 Poor propagation, geomagnetic storm

Why it matters: Higher K-index means worse HF conditions, especially on higher bands.

📡 FoF2 (Critical Frequency)

What it means: The highest frequency that will reflect off the ionosphere straight up (NVIS).

Displayed as: "3.8 MHz" means signals below 3.8 MHz will bounce back down.

Why it matters: Helps predict which bands are open for NVIS and regional contacts.

Region: Data from Northern Europe (Belgium ionosonde)

🌟 Solar Flare Alert

Shows REAL-TIME solar flare activity from NOAA satellites!

Classifications:

🟢 A-CLASS (QUIET): No flare activity
🟡 B-CLASS: Background activity, normal
🟠 C-CLASS: Moderate flares, minor HF effects
🔴 M-CLASS: Strong flares, HF degradation likely
🔴 X-CLASS: Major flares, complete HF blackout possible!

Example: "C3.2 C-CLASS FLARE ACTIVE" means a moderate C-class flare is happening RIGHT NOW.

🎯 MUF (Maximum Usable Frequency)

Three distances shown:

Distance	Use Case	M-Factor
500km	NVIS, Regional	1.5× FoF2
1000km	Medium range	2.0× FoF2
3000km	Long-range DX	3.0× FoF2

Example:

FoF2 = 3.8 MHz
MUF 3000km = 11.4 MHz
Meaning: Frequencies below 11.4 MHz can work for long-distance

☀️ Solar Data

A-Index: Daily geomagnetic activity average (lower is better)

Solar Flux (SFI): Radio emissions from the sun at 2800 MHz

< 100: Low activity, poor high-band conditions
100-150: Moderate activity
> 150: High activity, great for 10m/15m

Sunspot Number (SSN): Number of sunspots on the sun

More sunspots = better HF propagation on higher bands

📻 HF Band Conditions

Color-coded for quick reference:

🟢 GOOD: Excellent propagation expected
🟡 FAIR: Usable but not optimal
⚫ POOR: Difficult or impossible

Bands shown: 160m, 80m, 40m, 20m, 15m, 10m

Based on: MUF calculations + K-index + Solar Flux

🔄 Automatic Updates

The widget updates automatically - no refresh needed!

Update Schedule

⏰ Clock: Updates every 1 second (live UTC time)
📊 Data display: Updates every 60 seconds
🌐 Background data fetch: Every 5 minutes

You'll see: "2 min ago" in the bottom right showing data freshness

⚠️ Important Notes

Data Sources

All data is from trusted sources:

🛰️ NOAA: US Government space weather service
📡 HamQSL: Amateur radio data aggregator
🌐 GIRO: Global ionosphere monitoring network

Data is FREE - No API keys needed!

Privacy

The widget does NOT:

❌ Track users
❌ Use cookies
❌ Collect personal data
❌ Phone home

It only: Fetches public solar data from external APIs

Performance

Minimal impact:

Data cached for 5 minutes
No external calls from user browsers
Lightweight JavaScript
Fast page loads

🌍 Who Is This For?

Perfect For:

✅ WWBOTA Operators: Bunker activations
✅ Field Day Stations: Contest propagation monitoring
✅ DX Chasers: Know when bands are open
✅ NVIS Operators: Critical frequency monitoring
✅ Ham Radio Clubs: Share propagation data
✅ Emergency Communications: Monitor HF availability

📞 Getting Help

Need Support?

Check this guide - Most questions answered here
Browser console - Press F12, look for errors
Try different widget type - Maybe size issue
Clear cache - Use ?wwbota_clear_cache=1

🎓 Learning Resources

Understanding Propagation

Recommended reading:

ARRL Propagation Handbook
"The Sun and Radio Propagation" by K6HPX
NOAA Space Weather website

Online tools:

📝 Quick Reference Card

Shortcode Options

Shortcode	Size	Graphs	Theme	Best For
`☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`	220px	No	Dark	Sidebars
`☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`	220px	No	Light	Light sidebars
`☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. MUF 500km 5.5 MHz MUF 1000km 8.4 MHz MUF 3000km 12.7 MHz A-INDEX 10 SOLAR FLUX 167 SUNSPOT # 166 HF BAND CONDITIONS 160m 80m 40m 20m 15m 10m rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`	500px	No	Dark	Main content
`☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. MUF 500km 5.5 MHz MUF 1000km 8.4 MHz MUF 3000km 12.7 MHz A-INDEX 10 SOLAR FLUX 167 SUNSPOT # 166 HF BAND CONDITIONS 160m 80m 40m 20m 15m 10m rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`	500px	No	Light	Light content
`☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. MUF 500km 5.5 MHz MUF 1000km 8.4 MHz MUF 3000km 12.7 MHz A-INDEX 10 SOLAR FLUX 167 SUNSPOT # 166 HF BAND CONDITIONS 160m 80m 40m 20m 15m 10m 📊 PROPAGATION DATA Reliable NVIS (0-150km) Extended NVIS (150-400km) 📍 Your QTH SELECT BAND: rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`	850px	Yes	Dark	Dedicated pages
`☀️ Solar Propagation Kp-INDEX 2.7 QUIET FoF2 CRITICAL FREQUENCY 4.2 MHz NORTHERN EUROPE ⚠ C3.1 SOLAR FLARE RISK MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible. MUF 500km 5.5 MHz MUF 1000km 8.4 MHz MUF 3000km 12.7 MHz A-INDEX 10 SOLAR FLUX 167 SUNSPOT # 166 HF BAND CONDITIONS 160m 80m 40m 20m 15m 10m 📊 PROPAGATION DATA Reliable NVIS (0-150km) Extended NVIS (150-400km) 📍 Your QTH SELECT BAND: rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]`	850px	Yes	Light	Light pages

Data Refresh Times

Element	Update Frequency
Clock	1 second
Display data	60 seconds
Fresh API data	5 minutes
K-Index from NOAA	~3 hours
FoF2 from Dourbes	Real-time
X-ray flux	Near real-time

Multiple Sites

Can I use this on multiple sites? ✅ Yes! Just install on each WordPress site.

Is there a limit? ❌ No limits! It's completely free.

🎉 Enjoy!

You now have real-time HF propagation data right on your WordPress site!

Perfect for:

Planning QSOs
Contest operations
DX hunting
Field Day
Emergency communications

Questions? Refer back to this guide anytime.

73 de M0ICR

📌 Version Information

Version: 1.0
Released: February 2026
Compatibility: WordPress 5.8+, PHP 7.4+
Status: Production Ready ✅

Last Updated: February 4, 2026

🔧 Technical Guide

File Structure

functions.php
└── solar-widget-wordpress.php (paste entire contents)

Automatic Setup

Cron job: Auto-registers on wp hook
Intervals: Auto-adds 5-min schedule
First run: Triggers immediately

Manual Cache Clear

URL: yoursite.com/?wwbota_clear_cache=1

(Requires admin login)

🐛 Debugging

Enable WP_DEBUG

php

// wp-config.php
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);

Check Cron Status

Install “WP Crontrol” plugin
Look for wwbota_collect_solar_data event
Verify 5-minute interval

View Transient Data

php

$data = get_transient('wwbota_solar_data');
var_dump($data);

API Testing

php

// Test individual APIs
$result = wwbota_fetch_noaa_xray_flux();
$result = wwbota_fetch_dourbes_data();

📝 Code Quality

WordPress Standards

✅ Proper escaping (esc_attr, esc_html, esc_js)
✅ Nonce validation for admin actions
✅ Capability checks (current_user_can)
✅ Transient API usage
✅ Cron API integration

PHP Best Practices

✅ Namespaced functions (wwbota_ prefix)
✅ Error handling with fallbacks
✅ Type validation
✅ Clean, readable code structure

Performance

✅ Minimal database queries
✅ Efficient caching
✅ Conditional script loading
✅ Optimized API calls

🎓 Technical Requirements

Server Requirements

PHP: 7.4 or higher
WordPress: 5.8 or higher
MySQL: 5.6 or higher

Browser Compatibility

Chrome: 90+
Firefox: 88+
Safari: 14+
Edge: 90+

JavaScript

ES6+ features used (arrow functions, template literals, const/let)
Chart.js 4.4.0 from CDN

📚 External Dependencies

APIs (No Keys Required)

HamQSL Solar XML
NOAA SWPC JSON
Dourbes GIRO Database

JavaScript Libraries

Chart.js 4.4.0 (CDN)

WordPress Features

Shortcode API
Transient API
Cron API
AJAX (wp_ajax, wp_ajax_nopriv)

🔄 Update Strategy

Data Freshness

Solar flares: 5-minute accuracy (NOAA updates frequently)
K-index: 3-hour averages (updated hourly)
FoF2: Real-time ionosonde measurements

Cache Invalidation

Automatic: 5-minute expiry
Manual: Query string parameter
Cron: Background refresh every 5 minutes

🎯 Future Enhancements (Potential)

Planned Features

API Additions

Additional ionosonde stations
Solar wind data
Aurora predictions
Propagation maps

📞 Support & Maintenance

Common Issues

Widget not updating: Check cron with WP Crontrol
No data showing: Clear transient cache
Graphs not rendering: Verify Chart.js loading (full widget only)
Light mode not working: Check shortcode syntax

Debugging Steps

Enable WP_DEBUG
Check browser console for errors
Verify API endpoints are accessible
Test with ?wwbota_clear_cache=1
Inspect AJAX responses in Network tab

📄 License & Credits

Data Sources

NOAA: Space Weather Prediction Center (Public Domain)
HamQSL: Paul L. Herrman N0NBH (Free API)
GIRO: Global Ionosphere Radio Observatory (Academic use)

Libraries

Chart.js: MIT License
WordPress: GPL v2 or later

Author

Carl (M0ICR): WWBOTA Coordinator
For: Worldwide Bunkers on the Air

🎉 Conclusion

This widget provides amateur radio operators with professional-grade propagation data in a compact, easy-to-use format. The combination of real-time solar flare detection, accurate MUF calculations, and responsive design makes it ideal for WWBOTA bunker activations and general HF operating.

Version: 1.0
Last Updated: February 2026
Status: Production Ready ✅

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

MUF 500km

5.5

MHz

MUF 1000km

8.4

MHz

MUF 3000km

12.7

MHz

A-INDEX

SOLAR FLUX

167

SUNSPOT #

166

HF BAND CONDITIONS

160m

80m

40m

20m

15m

10m

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

MUF 500km

5.5

MHz

MUF 1000km

8.4

MHz

MUF 3000km

12.7

MHz

A-INDEX

SOLAR FLUX

167

SUNSPOT #

166

HF BAND CONDITIONS

160m

80m

40m

20m

15m

10m

📊 PROPAGATION DATA

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

MUF 500km

5.5

MHz

MUF 1000km

8.4

MHz

MUF 3000km

12.7

MHz

A-INDEX

SOLAR FLUX

167

SUNSPOT #

166

HF BAND CONDITIONS

160m

80m

40m

20m

15m

10m

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]

Kp-INDEX

2.7

QUIET

FoF2 CRITICAL FREQUENCY

4.2 MHz

NORTHERN EUROPE

⚠

C3.1 SOLAR FLARE RISK

MODERATE C-CLASS FLARE ACTIVE. Minor HF effects possible.

MUF 500km

5.5

MHz

MUF 1000km

8.4

MHz

MUF 3000km

12.7

MHz

A-INDEX

SOLAR FLUX

167

SUNSPOT #

166

HF BAND CONDITIONS

160m

80m

40m

20m

15m

10m

📊 PROPAGATION DATA

rmi • 5 minutes ago • FoF2: RMI:4.2 [OK F:4.2 M3k:12.7 M:3.02]