Solar Conditions and Ham Radio Propagation
1 day ago· Highest Frequency that reflects back from F2 Layer. Maximum Usable Frequency for Sky-Wave Propagation. Inspiration for this site, along with XML data, is courtesy N0NBH. Thanks!
Propagation
There is broad consensus that solar minimum is ongoing in 2020 — or may have already occurred — and that Cycle 25 will have no major change in the level of solar activity compared to Cycle 24. You
Sunspot Cycle Forecast and Current Optimal Frequency Chart for
Each chart displays the FOT (or Optimal Working Frequency) at each UTC hour, for the paths given. These radio frequencies are a percentage below the MUF (Maxiumum Usable Frequencies), and
WM7D dot Net
This chart is based on the NOAA Geophysical Alert Message (updated every three hours). Included are the Solar Flux, K-Index, and A-Index numbers for the past six months.
Current Ham Band Propagation Conditions * Explained Charts
Factors like time of day, solar activity, and ionospheric conditions drive these changes. Propagation charts visually aid in signal clarity estimation and long-distance communication potential
Summary of Solar Radio Emission Types and Characteristics
Figure 1 illustrates the frequency-time characteristics of solar radio phenomena. Table 1 provides a general description of the spectral classifications that correspond to figure 1, and table 2 provides
Predicted Sunspot Number And Radio Flux | NOAA / NWS Space
Multi-year forecast of the smoothed monthly sunspot number and the smoothed monthly F10.7. For further details see Solar Cycle Progression.
HFUnderground Propagation Data and Tools
These graphs show the solar x-ray flux levels for the past three days, as well as the past six hours. A solar flare will produce a dramatic spike in levels, these x-rays can ionize the D-layer of the
HF Propagation and Solar-Terrestrial Data Website
Free solar-terrestrial data displayed on your web page or site, updated every 3-hours.
HF Propagation and Sun Activity
BSDWorld provides valuable information on the impact of solar events for radio operators managing long-distance high-frequency communications.