Sunspot activity continued to drop until early this week: The average daily sunspot numbers were 26.3, down more than 58 points from last week’s numbers, while the average daily solar flux declined to 92.8, down over 33 points from last week’s average. The weekly sunspot number average has declined since the May 31-June 6 period, when it was 130.4, followed by 116.1 the next week, 84.6 the next…
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Sunspot numbers seemed to be in a free-fall this week: The average daily sunspot numbers declined more than 29 points to 87, while the average daily solar flux fell 6.2 points to 126.2. Sunspot numbers for June 14-20 were 114, 113, 110, 96, 66, 64 and 46, with a mean of 87. The 10.7 cm flux was 148.6, 144.9, 134.5, 124, 118, 109.9 and 103.7, with a mean of 126.2. The estimated planetary A indic…
American Radio Relay League | Ham Radio Association and Resources
Solar activity was lower this week, although for the past few days, both the sunspot numbers and solar flux were rising. The average daily sunspot numbers declined more than 14.3 points to 116.1, while the average daily solar flux was off by 14.5 points to 115.9. There were five new sunspot groups this week: two each on June 9-10, and one more on June 13. Sunspot numbers for June 7-13 were 98, …
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The average daily sunspot numbers increased about 60 percent during the past week (May 31-June 6), when compared to the previous seven days (May 24-30). The increase was 48.5 points, from 81.9 to 130.4. The average daily solar flux was also up: 18.6 points from 111.6 to 130.2. Sunspot numbers for May 31-June 6 were 76, 151, 113, 133, 155, 154 and 131, with a mean of 130.4. The 10.7 cm flux was …
American Radio Relay League | Ham Radio Association and Resources
The average daily sunspot numbers sank more than 28 points this week (nearly 26 percent) to 81.9, while the average daily solar flux declined more than 16 points to 111.6. This is for the seven days of May 24-30, and is compared to the previous seven days, May 17-23. Sunspot numbers for May 24-30 were 96, 86, 70, 83, 87, 73 and 78, with a mean of 81.9. The 10.7 cm flux was 115.5, 117.2, 110, 11…
American Radio Relay League | Ham Radio Association and Resources
The average daily sunspot numbers declined seven points over the past week to 110.3, while the average daily solar flux dropped 3.3 points to 131. Sunspot numbers for May 17-23 were 114, 118, 110, 124, 120, 95 and 91, with a mean of 110.3. The 10.7 cm flux was 136.3, 132.2, 130.9, 130.8, 125.1, 121.3 and 117.2, with a mean of 127.7. The estimated planetary A indices were 6, 8, 5, 13, 7, 16 and …
American Radio Relay League | Ham Radio Association and Resources
The average daily sunspot numbers for the past week rose nearly 25 points, or about 27 percent, to 117.3. The big day was Monday, May 14 when the daily sunspot number jumped to 156. This was the day after four new sunspot groups, numbered 1481 through 1484 arrived. Sunspot numbers for May 10-16 were 93, 102, 85, 138, 156, 125 and 122, with a mean of 117.3. The 10.7 cm flux was 130.7, 136.4, 129…
American Radio Relay League | Ham Radio Association and Resources
The average daily solar flux for the past week rose slightly, 116.2 to 119, but the average daily sunspot numbers declined more than 14 points (about 13 percent), to 92.6. Sunspot numbers for May 3-9 were 107, 101, 88, 104, 79, 90 and 79, with a mean of 92.6. The 10.7 cm flux was 114, 114, 116, 117.3, 121.7, 122.8 and 127.3, with a mean of 119. The estimated planetary A indices were 8, 4, 4, 5,…
American Radio Relay League | Ham Radio Association and Resources
The average daily sunspot numbers declined 38 points to 106.7 this week, while the average daily solar flux declined nearly 18 points to 116.2. Sunspot numbers for April 26-May 2 were 117, 99, 118, 114, 104, 99 and 96, with a mean of 106.7. The 10.7 cm flux was 119.2, 117.9, 121.1, 116, 114.1, 109.9 and 115.5, with a mean of 116.2. The estimated planetary A indices were 17, 8, 5, 5, 3, 4 and 5,…
American Radio Relay League | Ham Radio Association and Resources
Solar activity revived over the past week, with a big increase in sunspot numbers. On Friday, April 20, the daily sunspot number reached 162; four days later on April 24, the number reached 169. This level of activity has not been seen since last fall, when the daily sunspot number reached 173 on September 16, 184 on October 21 and 208 on November 9.
The average daily sunspot numbers more than d…
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As promised in the April 19th edition of The ARRL Letter, this week’s bulletin features a report on recent solar activity and solar cycle progression from Carl Luetzelschwab, K9LA.
Both the solar flux and sunspot numbers reached a short term low on April 8-11, but they are now rising again. For the past week — April 12-18 — the average daily sunspot numbers more than doubled, compared to the p…
American Radio Relay League | Ham Radio Association and Resources
I received quite a few inquiries regarding the solar setup I am using for my SOTA activations. I hope I answered all of them in this short video. If not, pleae fell free to add questions/comments.
Video Rating: 4 / 5
The bulletin appears a day early this week because ARRL Headquarters is closed for the Good Friday holiday.
Over the past week, the average daily sunspot number and solar flux values rose slightly, even though as the week progressed, each day had a lower number than the day before. The daily sunspot number began the week at a high of 100, but ended at 60. Likewise, the daily solar flux started a…
American Radio Relay League | Ham Radio Association and Resources
Eight new sunspot groups appeared this week, but the average daily sunspot number declined four points to 71.1; the average daily solar flux rose by less than two points to 103.7. Sunspot numbers for March 22-28 were 86, 74, 65, 84, 56, 63 and 70, with a mean of 71.1. The 10.7 cm flux was 102.4, 104.8, 102.7, 101.3, 102.4, 105.6 and 107, with a mean of 103.7. The estimated planetary A indices w…
American Radio Relay League | Ham Radio Association and Resources
Solar activity declined this week: The average daily sunspot numbers were off by more than 13 points to 75.1, while the average daily solar flux dropped over 32 points to 102.1. The solar flux dropped barely below 100, but rounded up to 100 as shown on the NOAA SEC site. The next short-term peak in solar flux is expected at the 135 level for April 3-6. The predicted solar flux for March 23-25 i…
American Radio Relay League | Ham Radio Association and Resources
The average daily sunspot numbers over the past reporting week (March 8-14) were 88.3, a rise of nearly 19 points; the average daily solar flux rose more than 12 points to 134.2. Sunspot numbers for March 8-14 were 86, 96, 89, 103, 89, 80 and 75, with a mean of 88.3. The 10.7 cm flux was 139.5, 145.5, 148.9, 131.2, 114.9, 140.7 and 118.8, with a mean of 134.2. The estimated planetary A indices …
American Radio Relay League | Ham Radio Association and Resources
This video was produced to answer the question that many people ask: Do residential grid connected solar power systems produce electromagnetic interference (EMI) and radio frequency Interference (RFI)? The medical condition associated with EMI is called Electromagnetic Hypersensitivity and Radio Wave Sickness (RWS). The system was producing approximately 900 watts of energy near solar noon in summertime with clear conditions.
This a review of a Yaesu FT-817 Solar Powered Go Pack. I built this solar powered case for my FT-817 radio so it can be used portable without the worry of power and keeping it self contained. It’s all contained in the case so it can easily be taken to a picnic, on holiday or attached to the backpack for a QRP adventure. Total cost for all the bits excluding the radio is about 0-0 (most bought off Amazon).
Video Rating: 4 / 5
cgi.ebay.com This is a bench test and on-air demo of an FT-101EE for sale on eBay.
Video Rating: 4 / 5