By David, on August 6th, 2010%
SB PROP @ ARL $ARLP031 ARLP031 Propagation de K7RA
ZCZC AP31 QST de W1AW Propagation Forecast Bulletin 31 ARLP031 From Tad Cook, K7RA Seattle, WA August 6, 2010 To all radio amateurs
SB PROP ARL ARLP031 ARLP031 Propagation de K7RA
Sunspot numbers and solar flux declined this week, with average daily sunspot numbers down over 15 points to 20.3, and average daily solar flux down nearly 4 points to 81.4. These are the numbers from last Thursday through this Wednesday, July 29 through August 5.
A new sunspot group emerged Wednesday, and three more appeared on Thursday. Sunspot numbers for Wednesday and Thursday were 27 and 54.
Geomagnetic . . .
To read the rest of this article, please click here: → Propagation Report August 6, 2010
By David, on July 30th, 2010%
SB PROP @ ARL $ARLP030 ARLP030 Propagation de K7RA
ZCZC AP30 QST de W1AW Propagation Forecast Bulletin 30 ARLP030 From Tad Cook, K7RA Seattle, WA July 30, 2010 To all radio amateurs
SB PROP ARL ARLP030 ARLP030 Propagation de K7RA
Sunspot activity increased again this week, but on Tuesday and Wednesday (July 27-28), a stiff solar wind increased Earth’s geomagnetic activity, which is a negative for HF propagation.
Sunspot group 1089 grew, shrunk, and is growing again, visible a total of 12 days as of early Friday. Three more sunspot groups appeared this week, with the latest, 1092 rapidly emerging on Wednesday with a relative size of 180 . . .
To read the rest of this article, please click here: → Propagation Report July 30, 2010
By David, on July 26th, 2010%
Sunspot activity increased recently, although it is foolish to call this a trend, since solar activity has great variability. Sunspot group 1087 was visible for 13 days over July 9-21. In millionths of a solar hemisphere, its size was 30, 100, 120, 130, 70, 100, 60, 50, 20, 10, 10, 10 and 10. On July 19, new sunspot group 1089 appeared over the eastern horizon, with a relative size of 130, 150, 310 and 240 for July 19-22. Sunspot numbers for July 15-21 were 15, 17, 13, 12, 25, 32 and 38, with a mean of 21.7. The 10.7 cm flux was 75.9, 76.6, 78.7, 76.9, 79.8, 87 and . . .
To read the rest of this article, please click here: → Propagation Report July 23, 2010
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