Propagation de K7RA

4 May, 2019

No sunspots were visible over the recent reporting week (April 25
through May 1), and so the average daily sunspot number dropped to 0
after 8.1 during the previous seven days. Average daily solar flux
declined from 70.6 to 67.5. Geomagnetic indicators were quiet, with
average planetary A index at 5.9, up from 4.7 in the previous week.

The predicted solar flux is 72 on May 3-5, 75 on May 6-9, 78 on May
10-16, then 76, 72 and 70 on May 17-19, 69 on May 20-21, 68 on May
22, 67 on May 23 through June 2, 70 and 75 on June 3-4, 78 on June
5-12, then 76, 72, 70 and 69 on June 13-16.

The predicted planetary A index is 5 on May 4-9, 8 on May 10, 5 on
May 11-19, 8 on May 20, 5 on May 21-26, then 10, 14, 12, 8 and 5 on
May 27-31, then 10, 12 and 14 on June 1-3, 8 on June 4-6, and 5 on
June 7-15, then 8 on June 16.

Interesting article in the New Yorker about Aurora Borealis tourism:https://bit.ly/2UvvVbN

A video posted last week from Dr. Tamitha Skov, WX6SWW:
https://youtu.be/W9Fp-O3Ddlo

Geomagnetic activity forecast for the period May 3-30, 2019 from
F.K. Janda, OK1HH.

"Geomagnetic field will be:
quiet on May 15, 19, 22-23
quiet to unsettled on May 6, 8-16, 18, 24-27
quiet to active on May 3-5, 17, 21, 28
unsettled to active on May 7, 20, 29-30

"No Active to Disturbed conditions are forecast.

"Solar wind will intensify on May 3-4, 9-13, 15, (20,) 22-23, 30

"Parenthesis means lower probability of activity enhancement."

Thanks to M0VNG and others for the tip to this article on moving
geomagnetism:
https://bit.ly/2IWoqJA

If you would like to make a comment or have a tip for our readers, email the author at k7ra@arrl.net.

For more information concerning radio propagation, see the ARRL Technical Information Service at http://arrl.org/propagation-of-rf-signals.

For an explanation of numbers used in this bulletin, see 
http://arrl.org/the-sun-the-earth-the-ionosphere.

An archive of past propagation bulletins is at
http://arrl.org/w1aw-bulletins-archive-propagation. 
More good information and tutorials on propagation are at 
http://k9la.us/.

Monthly propagation charts between four USA regions and twelve overseas locations are at http://arrl.org/propagation.

Instructions for starting or ending email distribution of ARRL bulletins are at http://arrl.org/bulletins.

Sunspot numbers for April 25 through May 1, 2019 were 0, 0, 0, 0, 0,
0, and 0, with a mean of 0. 10.7 cm flux was 67.5, 67.2, 66.9, 67.9,
66.9, 68.5, and 67.6, with a mean of 67.5. Estimated planetary A
indices were 5, 4, 6, 5, 5, 5, and 11, with a mean of 5.9. Middle
latitude A index was 4, 2, 5, 4, 6, 4, and 8, with a mean of 4.7.

• All propagation reports can be found at:
http://www.southgatearc.org/propagation