American Radio Relay League | Ham Radio Association and Resources
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources.
Geomagnetic disturbances were down this week, but so were sunspot
numbers and solar flux.
Average daily sunspot numbers declined from 92.7 to 68, and average
daily solar flux from 141.3 to 134.3.
On September 22 the sunspot number was 99, well above (by 31 points)
the average for the previous seven days, a promising indication. We
hope it may signal a trend.
But Solar Cycle 25 progresses, a bit better...
The National Hurricane Center (NHC), the Hurricane Watch Net (HWN), the Voice over Internet Protocol (VoIP) Hurricane Net, and the Salvation Army Team Emergency Radio Network (SATERN) all have been engaged in tracking Hurricane Fiona.
Amateur radio operators have been reporting weather conditions since Monday, September 19, 2022, and have received positive feedback on their assistance. The VoIP ...
Solar activity bounced back this reporting week, September 8-14, when average daily sunspot numbers jumped from 68 to 92.7, and average solar flux from 125.8 to 141.3.
Fewer CMEs and flares were evident, with average planetary A index declining from 24.6 to 10.7, and middle latitude numbers from 17.4 to 10.6.
New sunspot groups appeared, one on September 8, three on September 10, and one more on ...
Viewing page 1 of 3|Next Page