The 10.7 centimeter solar flux index (SFI) jumped to a Cycle 24 record of 262 on January 4, suggesting that Cycle 24 has not yet begun drawing to a close and may be approaching or at a “second peak.” The previous peak for the current cycle was 190 on September 24, 2011. As NASA’s Marshall Space Flight Center (MSFC) explains, the flux of the sun’s radio emissions at 10.7 centimeter (2.8 GHz) is …
American Radio Relay League | Ham Radio Association and Resources
By Stan Horzepa, WA1LOU
Contributing Editor
This week, Surfin’ finds out which way the wind blows — and which way the propagation flows — at the revamped National Weather Service website.
As hams, we seem to be more interested in the weather than average people. Besides wanting to know what’s falling out of the sky and when, we follow the weather because it affects radio propagation in both a n…
American Radio Relay League | Ham Radio Association and Resources