On Wednesday, March 26, around 2130 UTC a Major Storm occurred. Atone point, the Planetary A Index was 49, and...
sunspot
Solar activity reached moderate levels due to an isolated M1.5/1nflare on March 19 at 2040 UTC from Region AR4031. Regions...
Geomagnetic field activity is expected to be at minor storm levels for March 18, and then from March 27 and...
Spaceweather.com is reporting "A Hole In The Sun's Atmosphere" thatshould reach Earth on March 9 and 10. Solar activity has...
A Coronal Mass Ejection (CME) associated with a filament eruptionbecame visible on February 26 at 1448 UTC. Model analysisdetermined this...
Solar activity is expected to range from low to moderate levelsthrough March 15. There is a varying chance for R1...
NOAA reports a G1 (Minor) geomagnetic Storm Watch has been issuedfor 14 Feb, 2025. A coronal hole high speed stream...
Spaceweather.com reports that sunspot 3981 has produced more than 20M-class solar flares, including two that almost reached category X. The...
Solar Update Report January 30, 2025 The sun has been moderately active this past week. The greater than 2 MeV...
Last week was pretty unremarkable as far as the Sun goes, but it looks like that is about to change....
Sorry to say this is the last ARRL Propagation Forecast Bulletin Iwill write. I took over in 1991 from Ed...
Solar activity was a bit weak during recent days. Average dailysunspot number was 159.1. During the previous week the average...
Currently a geomagnetic storm is raging. On January 1-2, Alaska'scollege A index reached 113. Predicted planetary A index is 12...
Strong solar activity continues, with worldwide propagation on 10and 12 meters quite commonplace. Predicted solar flux is 255, 250, 210,...
Solar activity seems to have dropped dramatically from a recent peak. Are we over the cycle peak and headed down...
ARRL Headquarters was closed on November 29. So, this regular Fridaybulletin was moved to the following Monday (12/2). Solar activity...
Solar activity was lower this reporting week, November 14-20, withthe average daily sunspot number down from 141.6 to 99.3, and...
Solar activity was a bit lower this week. Seven new sunspot groups appeared. The only day with no new sunspot...
With the big increase in sunspot numbers and solar flux reported inlast week's Propagation Forecast Bulletin ARLP013, I hoped the...
Six new sunspot groups appeared over the past reporting week, March7-13, and one more on March 14.The first group emerged...
Until March 6, new sunspot groups emerged daily over the past reporting week, February 29 through March 6. One new...
Over the recent reporting week, February 1-7, ten new sunspot groupsemerged, five on February 1, one on February 2, another...
An intense solar event occurred in the early hours of February 6, as a sunspot unleashed a powerful M4-class solar...
Departing sunspot AR3559 erupted Monday morning, Jan 29th (0438 UT), producing a strong M6.8-class solar flare. NASA's Solar Dynamics Observatory recorded the...
The Winter Solstice, the shortest day of the year in the NorthernHemisphere occurred at 0327 UTC on December 22. It...
