ARLP015 Propagation de KT7H: April 11, 1997

Propagation Forecast Bulletin 15 ARLP015
From Tad Cook, KT7H
Seattle, WA April 11, 1997
To all radio amateurs

ARLP015 Propagation de KT7H

Solar activity was up last week. Flux went as high as 80, and then on Monday morning there was a big eruption on the Sun that ejected a large amount of matter toward earth. It was originally thought that perhaps this might cause a big disturbance here on Wednesday, but effects weren't really felt until Thursday. As this was being written Friday morning UTC, the K index was 7 at the 0300z and 0600z readings.

"The eruption seemed to blow open a hole in the Sun's corona," said Dr. Barbara Thompson, a SOHO scientist.

Images of this eruption taken by the SOHO satellite can be seen at the following web site:

Watch for solar flux to drop soon to the low seventies, but then jump back to 80 by the end of the month.

Sunspot Numbers for April 3 through 9 were 46, 36, 36, 28, 16, 27 and 30 with a mean of 31.3. 10.7 cm flux was 78.8, 78.5, 80.2, 78.1, 76.8, 76.1 and 78.1, with a mean of 78.1, and estimated planetary A indices were 7, 12, 8, 11, 7, 4, and 5, with a mean of 7.7.

The JA CW DX Contest is this weekend, and since the object is to work Japanese stations, here are some path projections to Japan: