Noon 10.7cm Radio Flux
A classic measure of solar activity that helps describe the broader space weather background.
Past 30 Days
Noon 10.7cm radio flux measurements over the past 30 days.
About Noon 10.7cm Radio Flux
The 10.7 cm (2800 MHz) solar radio flux, also called F10.7, is a long-standing indicator of solar activity. It is measured in solar flux units (sfu).
Solar Cycle Correlation
F10.7 closely follows the Sun’s roughly 11-year solar cycle, making it useful for tracking medium and long-term solar activity trends.
How to Read It
- Below 100 sfu: lower solar activity.
- 100 to 200 sfu: moderate solar activity.
- Above 200 sfu: higher solar activity and more energetic space weather.
Why It Matters
- Helps estimate F-layer ionospheric strength.
- Supports thermosphere density estimates.
- Provides another reference for active space weather.
- Helps track the solar activity cycle.
This page is automatically generated from the public data sources listed below. The information is not quality controlled and may not update in a timely manner, so you accept all risks and responsibility arising directly or indirectly from using it, including data from NOAA SWPC, BOM SWS, Canadian Space Agency, SGO, IRF, Natural Resources Canada and City of Hobart.