The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources.
- The K7RA Solar Update
On Wednesday, June 20 Spaceweather.com reported the sudden emergence of sunspot AR2715. The sunspot number on that day shot up to 54, and it was 53 the next day. Average daily sunspot number for the reporting week (June 14-20) was 25.7, up from 4 the previous week. Average daily solar flux rose from 69.4 to 74. Solar flux was 82.1 on June 20.
We have not seen numbers such as this since last Sept...