There has been an exciting and dramatic rise in sunspot activity this week. The daily sunspot number was 188 on Monday, November 12 — higher than it has been in more than a year. The last time the daily sunspot number was as high was on November 9, 2011, when it was 208. Prior to last November, we have to go back nine years — November 26, 2003 — into the previous solar cycle to find a number…
American Radio Relay League | Ham Radio Association and Resources
Sunspot activity rose this week, with the average daily sunspot numbers up more than 45 points to 97, while the average daily solar flux rose more than 24 points to 129.2. Sunspot numbers for October 11-17 were 82, 89, 85, 97, 119, 107 and 100, with a mean of 97. The 10.7 cm flux was 116.6, 121.9, 124.9, 132.1, 136.8, 137 and 135, with a mean of 129.2. The estimated planetary A indices were 6, …
American Radio Relay League | Ham Radio Association and Resources
There was another decline in sunspot activity this week, but based on activity over the past few days, combined with the projected solar flux values, it is making a steady recovery. The sunspot numbers for October 4-10 were 56, 55, 39, 37, 41, 63 and 71, with a mean of 51.7. The 10.7 cm flux was 109.5, 106.2, 98.8, 98.1, 103.4, 106.2 and 112, with a mean of 104.9. The estimated planetary A indi…
American Radio Relay League | Ham Radio Association and Resources
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…
American Radio Relay League | Ham Radio Association and Resources