This page contains a dynamic collection of propagation information gathered from many different sources. This data is extremely useful for ham radio operators and shortwave listeners to help determine whether or not long distance radio communications are possible.
The current time is: 21:01 UTC on Saturday, September 23, 2023
|Current Solar Indices from WWV|
23-Sep-2023 at 1805 UTC
SFI = 176 A = 8 K = 1
|Conditions during the last 24 hours|
Space weather for the past 24 hours has been minor.
Radio blackouts reaching the R1 level occurred.
|Forecast for the next 24 hours|
Space weather for the next 24 hours is predicted to be minor.
Geomagnetic storms reaching the G1 level are likely. Radio blackouts reaching the R1 level are likely.
Solar Wind Data
Provides solar wind velocity and energetic particle intensity
Updated at: 2047Z on September 23, 2023
|Velocity (km/s):||295.0 |
|Density (protons/cm3):||0.1 |
(ACE satellite solar wind data has been intermittent)
|The Penticton Observatory SFI value on 23-Sep-2023 at 1700Z was:||174|
|Solar Activity Forecast|
|R1-R2 (Minor-Moderate) radio blackouts are likely, and there is a slight chance R3 (Strong) or greater radio blackouts over 22-24 Sep.|
|Geophysical Activity Forecast|
|The geomagnetic field is expected to be at mostly unsettled to active levels on 22 Sep due to negative polarity CH HSS onset. G1 (Minor) geomagnetic storming is likely 23-24 Sep due to first shock and glancing influences from the 20 Sep CME followed by the arrival of the 21 Sep CME by late on the 24th.|
|The NOAA Sunspot number for 22-Sep-2023 was:||184|
|Most recent five days (oldest first):||94 139 143 159 159|
|The GOES-14 Background X-ray Flux level on 22-Sep-2023 was:||*|
|Most recent five days (oldest first):||* * * * *|
Aurora (also known as "aurora borealis" or "northern lights") is caused by interaction between the Earth's magnetic field and the solar wind (a mix of charged particles blowing away from the sun). During storms, enough of these charged particles make it through to the Earth's upper atmosphere that they interact with the earths natural magnetic field lines. When enough of these particles collide, energy is released in the form of auroral light. In addition to creating a pretty light show (mostly in upper latitudes), ham radio signals scatter off of these particles and can greatly enhance propagation on the VHF and UHF ham radio bands. High levels of aurora can also make HF ham radio propagation via polar routes difficult.
Click on thumbnails to view a
Images courtesy of the NOAA Auroral Activity site
Solar X-ray Flux
This chart shows X-ray flux levels as measured by the GOES-13 and GOES-15 satellites. The measurements (shown in red) are used to issue alerts when X-ray flux levels exceed certain levels. Spikes on the chart correspond to solar flares. Flares are considered "significant" when flux levels rise above the "M" level (as shown on the right side of the chart). These large flares can often wipe out the ham radio and shortwave bands almost immediately and it can take minutes to hours for the bands to recover. If the ham radio bands seem to go dead all of a sudden, it is always a good idea to check this chart to see if a large flare has occurred recently.
The Solar X-ray Flux graph is temporarily broken.
Click here to view it on the NOAA site
Dynamically updating plots:
1-minute and 5-minute X-ray K-index
Proton Flux Electron Flux GOES Magnetometer
Grey Line Map
The grey line is a band around the Earth that separates the daylight from darkness. Radio propagation along the grey line is very efficient. One major reason for this is that the D layer, which absorbs HF signals, disappears rapidly on the sunset side of the grey line, and it has not yet built upon the sunrise side. Ham radio operators and shortwave listeners can optimize long distance communications to various areas of the world by monitoring this area as it moves around the globe. This map shows the current position of the grey line terminator.
Click here to show a dynamically updating Grey Line map
The following map shows Maximum Usable Frequencies (MUFs) for 3000 kilometer radio signal paths. The grey line position is also provided.
Image courtesy of the KC2G propaation pages
Current Sun Images
The images below are current views of the sun shown at different wavelengths of light as taken by SOHO and the Yohkoh soft-Xray telescope. Generally, more bright regions on the disk indicates more solar activity, which usually leads to higher flux levels (which also often leads to better ham radio and shortwave propagation). Click on any thumbnail to view a larger image.
Sometimes you may see the text "CCD Bakeout" instead of the images. This occurs when NASA does routine maintenance and calibration on the cameras. For a more technical explanation, read NASA CCD Bakeout explanation.
Images courtesy of the SDAC at the NASA Goddard Space Flight Center
Help support dx.qsl.net!
Make your Amazon purchases by clicking on the Amazon icon.
Layout and dynamic reports created by amateur radio N6RT
Comments or Questions? Email [email protected]