Tad "My Sun sets to raise again" Cook, K7RA, this week reports:
This week we saw only one sunspot, number 997, and only on Memorial Day, May 26. Alas, this was another sunspot left over from fading Solar Cycle 23 and its appearance was very brief. One day it weakly emerged, it quickly faded from view. The previous five days were spotless; spots appeared on the five days prior to that, and previous to those spotted days were 10 days of no spots.
Sunspot numbers for May 22-28 were 0, 0, 0, 0, 12, 0 and 0 with a mean of 1.7. The 10.7 cm flux was 69.3, 67.8, 68.5, 68.3, 68, 67.9 and 67.8 with a mean of 68.2. Estimated planetary A indices were 9, 10, 7, 6, 4, 3 and 12 with a mean of 7.3. Estimated mid-latitude A indices were 7, 7, 4, 7, 3, 2 and 10, with a mean of 5.7.
For more information concerning radio propagation, visit the ARRL Technical Information Service Propagation page <http://www.arrl.org/tis/info/propagation.html>. To read this week's Solar Report in its entirety, check out the W1AW Propagation Bulletin page <http://www.arrl.org/w1aw/prop/>.
| Notes | This solar update is brought to you courtesy of the American Radio Relay League's ARRL Letter. |