Sorry to say this is the last ARRL Propagation Forecast Bulletin Iwill write. I took over in 1991 from Ed...
sunspot
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...
Six new sunspot groups emerged over this reporting week (November 30to December 6).Last week, using the previous week's Propagation Forecast...
Geomagnetic conditions were very quiet last weekend, good conditionsfor the ARRL Phone Sweepstakes. But there was much more geomagneticactivity toward...
"GEOMAGNETIC DISTURBANCE WARNING ISSUED AT 2333 UTC on 02 NOVEMBER 2023 BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE. "A possible...
The recent solar activity decline continues. Weekly average daily sunspot numbers starting with Propagation Forecast bulletin ARLP039 on September 21...
ASWFC GEOMAGNETIC DISTURBANCE WARNING ISSUED AT 0249UTC on 22 SEPTEMBER 2023 BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE: "Solar wind...
A long duration M1.2 solar flare took place around departing sunspot region 3413 yesterday which peaked around 03:52 UTC. This...
Welcome to July! A month where both our American and French friends celebrate very important holidays with lots of celebrations...
Sunspot region 3354 departs with a major X1.0 solar flare (R3-strong) yesterday at 23:14 UTC as it approaches the west...
A surprise this night from sunspot region 3182 which has just rotated into view. It produced a major X1.2 solar...
One of the biggest sunspots in years has just rotated over the sun's northeastern limb. AR3112 has a mixed-polarity magnetic...
