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The K7RA Solar Update


Hard for me to believe, I had to blink to make sure, but on Wednesday, June 8 for the first time this calendar year there were no sunspots, even though two new sunspot regions appeared on June 4.

Average daily sunspot number declined to 44 from 52.9 last week. Average daily solar flux was only 99.4, down from 104.3 last week and 158.8 the week before.

News about the first spotless day can be found here:

I am grateful that on Thursday, June 9, a new sunspot group emerged, bringing the sunspot number for the day to 17.

Predicted solar flux is 105 on June 10, 110 on June 11-16, 115 on June 17, 120 on June 18, 125 on June 19-20, 150 on June 21, 110 on June 22, 100 on June 23 through July 3, 105 on July 4-5, 110 on July 6-10, then 115 on July 11-13, 120 on July 14, and 125 on July 15-16.

Assuming the above prediction is true, this would mean average daily solar flux rising from 99.4 to 109 over the next reporting week and 123 the next.

Predicted planetary A index is 5 on June 10-14, then 8, 12 and 8 on June 15-17, 5 on June 18-22, then 12, 18, 10 and 8 on June 23-26, 5 on June 27 through July 9, then 12, 8, 12, 10 and 8 on July 10-14, and 5 on July 15-19.

Despite the recent downturn, Solar Cycle 25 activity exceeds the official forecast:

According to, May 2022 sunspot activity was the highest it's been in eight years.

OK1HH wrote:

"As during the last solar revolution, solar activity has been low in the last two weeks.

"On June 8, the Sun was even empty - no sunspots - R = 0.

"This is a remarkable development more than 2 years after the beginning of Solar Cycle 25. However, during the last few hours, rapid spots have been observed near the central meridian. In addition, NASA's STEREO-A spacecraft is monitoring a probable group of sunspots approaching beyond the northeastern edge of the Sun:


"It should be followed by other groups of spots, which will increase solar activity again.

"The Earth's magnetic field was largely quiet, except for an increase in activity on June 6.

"The result was an improvement in the propagation conditions on June 6 and a degradation on June 7 and the morning of June 8. Gradual improvement can be expected in the coming days."

W9NY wrote:

"Just got a new dipole up on 10 meters on my condo roof which is over 400 feet off the ground overlooking Lake Michigan.

"Made a couple of contacts late this afternoon into Texas and Louisiana S5-S6 and nothing else on the band, until a ZL called me from New Zealand about 6:20 PM local time. He gave me an S9, and he was S5. Just like the good old days on 10 meters!

"The ionosphere has to be working, I think, to get over to New Zealand."

Some observations from K7RA on 6 and 12 meters this week:

On June 4, at 1745 UTC on 6 meter FT8 I worked KB1EFS/2 in Cape Vincent, New York.

On I saw that my signal was propagating along a very narrow arc at 72-74 degrees received only by a concentration of stations in the northeast USA. No real 6 meter antenna here, just a 32 foot end-fed wire, 4:1 UnUn and autotuner, mostly indoors on the second floor of my 1907 all wood Craftsman home.

Just prior to that at 1730 UTC I seemed to be monitored only by stations 2000-2500 miles from me in an arc with bearings 77-79 degrees with WA9WTK at the south and VE3TTP at the north.

On June 9 at 2300 UTC on 12 meters FT8 I am only heard by N4DB at 91 degrees, 2292 miles and K4BSZ at 94 degrees, 2276 miles. Then at 2320 UTC, WB4EVH at 2326 miles and 103 degrees bearing, at 2330 UTC, VK5PJ at 8306 miles, 250 degrees.

Here is an article about aurora:

Mostly good info, except the statement about being halfway through this Solar Cycle. I guess we might be halfway toward the peak.

Here is a link about the K-index:

Here is a nice solar image, and another interesting link:

Amateur Astro photographer and his image:

More information here:

Here is a 3-week movie of sunspot activity:

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For more information concerning shortwave radio propagation, see and the ARRL Technical Information Service web page 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

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Sunspot numbers for June 2 through 8, 2022 were 59, 52, 75, 57, 45, 23, and 0, with a mean of 44.4. 10.7 cm flux was 100.9, 100.7, 100.9, 98.7, 96.4, 98.4, and 99.9, with a mean of 99.4. Estimated planetary A indices were 5, 4, 4, 4, 10, 8, and 5, with a mean of 5.7. Middle latitude A index was 5, 4, 4, 5, 10, 11, and 5, with a mean of 6.3.




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