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The K7RA Solar Update


Another week went by with no sunspots. Average daily sunspot number this week rose from 69.9 to 70.4. Average planetary A index rose from 3.6 to 8.3.

Predicted solar flux is 70 on November 29 through December 6, 69 on December 7-8, 70 on December 9-22, 69 on December 23 through January 4, and 70 on January 5-12.

Planetary A index is predicted at 5 on November 29 through December 2, 8 on December 3-4, 5 on December 5-7, 8 on December 8, 5 on December 9-12, 6 on December 13, 5 on December 14-17, then 12 and 10 on December 18-19, 8 on December 20-25, 5 on December 26 through January 8, 6 on January 9, and 5 on January 10-12.

OK1HH sent this:

Geomagnetic activity forecast for the period November 29-December 24, 2019

Geomagnetic field will be
quiet on November 29-30, December 1, 10-16
quiet to unsettled on: December 2, 7-9, 17, 20-14
quiet to active on: December 3-6
unsettled to active on: December 18-19
active to disturbed:- none

Solar wind will intensify on December (3-9, 13-14,) 16-17, (18-24). Parenthesis means lower probability of activity enhancement.

Mike Schaffer, KA3JAW of Easton, Pennsylvania observed effects from this meteor event: This event is mentioned in the new video from WX6SWW referenced at the end of this bulletin.

Mike wrote: "I had two low, one medium, and one high quality pings on FM broadcast (89.1) during the peak which lasted for sixteen minutes from 11:52 pm - 12:08 am.

“I was using a dual-purpose home/auto Visteon HD Jump Radio with an auto monopole antenna in the horizontal plane poking out the second story radio room north window that is physically orientated to the north/south,  giving a RF beam direction from the west-east.

“Nothing was seen on the AirSpy HF+ SDR Console spectrum analyzer, waterfall displays with an Antennacraft TV VHF-Lo band (channels 2-6), five element Yagi, model Y526, laying on the top of the backyard shed with a 30 degree pitch angle aimed westerly on analog TV channel 2 (video 55.250, -/+), for detection of active Canadian stations.

“In my opinion the RF meteor scatter propagation outburst activity was fairly good within a short matter of time."


There is the latest video from WX6SWW:

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For more information concerning radio propagation, see the ARRL Technical Information Service at For an explanation of numbers used in this bulletin, see

An archive of past propagation bulletins is at More good information and tutorials on propagation are at

Monthly propagation charts between four USA regions and twelve overseas locations are at

Instructions for starting or ending email distribution of ARRL bulletins are at

Sunspot numbers for November 21 through 27, 2019 were 0, 0, 0, 0, 0, 0, and 0, with a mean of 0. 10.7 cm flux was 70.8, 69.6, 70.2, 70.6, 69.5, 70.4, and 71.5, with a mean of 70.4. Estimated planetary A indices were 12, 13, 10, 11, 5, 3, and 4, with a mean of 8.3. Middle latitude A index was 7, 8, 7, 8, 5, 3, and 2, with a mean of 5.7.




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