Tad "Bright as ever shines the Sun" Cook, K7RA, this week reports: We've had another week with no sunspots. Our reporting week for this bulletin runs from Thursday through Wednesday, and this is the fifth bulletin of the year reporting zero sunspots for the week.
Geomagnetic indices were quiet. But next Tuesday, May 20 should be quite active. Predicted planetary A index for May 16-22 is 5, 5, 5, 12, 30, 15 and 8. Geophysical Institute Prague expects quiet conditions May 16-18, quiet to unsettled May 19, active geomagnetic conditions May 20, unsettled May 21, and quiet to unsettled May 22.
Sunspot numbers for May 8 through 14 were 0, 0, 0, 0, 0, 0, and 0 with a mean of 0. 10.7 cm flux was 66.4, 67.3, 67.4, 68, 68, 68.3, and 69 with a mean of 67.8. Estimated planetary A indices were 4, 3, 5, 3, 4, 4 and 3 with a mean of 3.7. Estimated mid-latitude A indices were 3, 3, 4, 3, 3, 3 and 1, with a mean of 2.9.
For more information concerning radio propagation, visit the ARRL Technical Information Service Propagation page. To read this week's Solar Report in its entirety, check out the W1AW Propagation Bulletin page.
| Notes | This solar update is brought to you courtesy of the American Radio Relay League's ARRL Letter. |