[SFDXA] Propagation de K7RA

[Bill]

Propagation de K7RA

18 April, 2020

Sunspots are gone again. We are at the bottom of the solar cycle, so 
conditions should only get better. There is an increase in on-air 
activity due to the large number of people staying at home because of 
Covid-19, and this week we seem to be overwhelmed with reports of 
sporadic E openings.

The last observed sunspot disappeared on April 5, so weekly average 
daily sunspot numbers declined from 5.1 last week to zero this reporting 
week, April 9 to 15. Average daily solar flux went from 70.2 to 69.5.

Geomagnetic indicators remain quiet as well, with average daily 
estimated planetary A index going from 6.6 to 6.1, and mid-latitude 
numbers, sourced from a single magnetometer in Virginia, to 5 from 5.3.

Predicted solar flux is 69 on April 17 to 24, 70 on April 25 through May 
8, 68 on May 9 to 20, and 70 on May 21 to 31.

Predicted planetary A index is 8 on April 17 and 18, 12 and 8 on April 
19 and 20, 5 on April 21 to 25, 10 on April 26 and 27, 5 on April 28 and 
29, 8 on April 30, 5 on May 1 to 4, then 12, 5, 8 and 8 on May 5 to 8, 
then 5 on May 9 to 11, 10 on May 12, 8 on May 13 to 16, 5 on May 17 to 
22, 10 on May 23 and 24, then 5, 5 and 8 on May 25 to 27, and 5 on May 
28 to 31.

Geomagnetic activity forecast for April 17 til May 12, 2020 from
F.K. Janda, OK1HH:
"Geomagnetic field will be
Quiet on April 20 and 21, May 2 and 3, 6 Quiet to Unsettled on April 17 
and 18, 22 to 24, 28 and 29 Quiet to Active on (April 25, May 1, 5, 7 to 
9, 12) Unsettled to active on (April 19, 26 and 27, 30, May 4, 10 and 
11) Active to Disturbed: Nothing.
Solar wind will intensify on April 17 to 19, (20,) 26 to 28, May 4 to 6, 
8 to 10
Remarks:
- Parenthesis means lower probability of activity enhancement.
- The predictability of changes remains lower as there are no indicators."