Propagation Report December 10, 2010

ZCZC AP49 QST de W1AW Propagation Forecast Bulletin 49 ARLP049 >From Tad Cook, K7RA Seattle, WA December 10, 2010 To all radio amateurs

SB PROP ARL ARLP049 ARLP049 Propagation de K7RA

Average daily sunspot numbers for the week were up over nine points, to 35, and average solar flux rose over six points to 87.3. These differences compare the dates December 2-8 with the previous seven days. Average planetary A index declined 2.5 points to 2.1, while average mid-latitude A index dropped 1.1 points to 1.6. These are nice numbers, with higher sunspot numbers accompanied by lower geomagnetic indices.

Predicted solar flux for the near term is right . . .

To read the rest of this article, please click here: → Propagation Report December 10, 2010

Propagation Report November 5, 2010

SB PROP @ ARL $ARLP044 ARLP044 Propagation de K7RA

ZCZC AP44 QST de W1AW Propagation Forecast Bulletin 44 ARLP044 >From Tad Cook, K7RA Seattle, WA November 5, 2010 To all radio amateurs

SB PROP ARL ARLP044 ARLP044 Propagation de K7RA

Last week we promised more from Stu Phillips, K6TU about propagation and WSPR. Stu put together an excellent presentation with his observations. You can see it along with the comments by Carl Luetzelschwab, K9LA at

http://1vc.typepad.com/ethergeist/2010/11/wspr-hf-propagation.html.

Average daily sunspot numbers declined again this week, this time by nearly 25 points to 25.7, about half what it was last week. Last week’s average was down about five points from . . .

To read the rest of this article, please click here: → Propagation Report November 5, 2010

Propagation Report October 29, 2010

SB PROP @ ARL $ARLP043 ARLP043 Propagation de K7RA

ZCZC AP43 QST de W1AW Propagation Forecast Bulletin 43 ARLP043 >From Tad Cook, K7RA Seattle, WA October 29, 2010 To all radio amateurs

SB PROP ARL ARLP043 ARLP043 Propagation de K7RA

The daily sunspot number went all the way to 74 this week (on Tuesday, October 26), but the average sunspot number was down over five points from the previous week, to 50.3.

Several sunspot groups contributed this week. 1113 first appeared October 13, and was visible through October 26. 1115 emerged on October 15, and ran through October 27, its last day. 1117 emerged October 19, and was . . .

To read the rest of this article, please click here: → Propagation Report October 29, 2010

Propagation Report October 22, 2010

SB PROP @ ARL $ARLP042 ARLP042 Propagation de K7RA

ZCZC AP42 QST de W1AW Propagation Forecast Bulletin 42 ARLP042 >From Tad Cook, K7RA Seattle, WA October 22, 2010 To all radio amateurs

SB PROP ARL ARLP042 ARLP042 Propagation de K7RA

Average sunspot numbers for the week were up nearly 44 points to 55.6. Average solar flux readings were unchanged, at 84.9. For a few days solar flux values rose above 90, but currently the projection from USAF and NOAA for solar flux over October 22-31 is 82, 82, 82, 82, 80, 80, 80, 80, 80 and 80.

The same forecast predicts planetary A index for the same period . . .

To read the rest of this article, please click here: → Propagation Report October 22, 2010

Propagation Report October 15, 2010

> ZCZC AP41 > QST de W1AW > Propagation Forecast Bulletin 41 ARLP041 >> From Tad Cook, K7RA > Seattle, WA October 15, 2010 > To all radio amateurs > > SB PROP ARL ARLP041 > ARLP041 Propagation de K7RA > > Solar activity dropped again this week, although it is now gradually > strengthening. Average daily sunspot numbers declined nearly 16 > points to 11.7, and average daily solar flux dropped over five > points to 75.8. Over the next two weeks solar flux is expected to > gradually increase, from 80 on October 15-16, 82 on October 17, 84 > on October 18-22, 80 on October 23-25, . . .

To read the rest of this article, please click here: → Propagation Report October 15, 2010