At 2330 UTC on July 24, Australia’s IPS Radio and Space services issued a geomagnetic disturbance warning. Increased geomagnetic activity is expected due to a coronal mass ejection. They predict quiet to unsettled conditions on July 25, active to minor storm on July 26, and active conditions on July 27.
As this bulletin nears release early Friday morning, the planetary A index was 4 on four rece…
American Radio Relay League | Ham Radio Association and Resources
While solar activity weakened this past week, geomagnetic conditions were stable. The geomagnetic storm predicted for last weekend did not happen, and both the planetary and mid-latitude A index only rose to 10 on April 14 in response to a glancing blow from a coronal mass ejection (CME). The average daily sunspot numbers declined nearly 25 points to 113.3, while the average daily solar flux wa…
American Radio Relay League | Ham Radio Association and Resources
This past week, the average daily sunspot numbers were up 16.2 points to 101.1, while the average daily solar flux remained about the same, rising from 118.5 to 119. An eruption on March 15 caused a coronal mass ejection (CME) that hit Earth on March 17, causing the planetary A index to jump to 46. Sunspot numbers for March 14-20 were 133, 105, 90, 126, 116, 68 and 70, with a mean of 101.1. The…
American Radio Relay League | Ham Radio Association and Resources
Will it be possible to beat the 2011 running of the ARRL 10 Meter Contest? With more than 5300 logs received and worldwide openings last year, that may be a tall order. This past weekend during the CQ WW CW Contest, 10 meters was in great shape, despite a coronal mass ejection that hit on Friday evening. But according to ARRL Contest Branch Manager Sean Kutzko, KX9X, one thing’s for certain: Th…
American Radio Relay League | Ham Radio Association and Resources
A coronal mass ejection (CME) hit the Earth on September 30, triggering a jump in geomagnetic indices. The planetary A index on October 1 was 31, and the K index jumped to 7, making aurora visible across the northern tier of the United States. The northern latitude college A index was 23 (near Fairbanks, Alaska), about the same as the mid-latitude index — which was 21 — in Fredericksburg, Vir…
American Radio Relay League | Ham Radio Association and Resources