The K7RA Solar Update The average daily sunspot numbers were up
nine points to 25.3 for this week, compared to the May 20-26
period; the average daily planetary A index rose nearly 10
points to 14.3, and this rise in geomagnetic instability came
with the increase in solar activity. Sunspot numbers for May
27-June 2 were 11, 12, 43, 40, 39, 14 and 18, with a mean of
25.3. The 10.7 cm flux was 72.7, 73.2, 73.7, 73, 72, 72.7 and
74, with a mean of 73. The estimated planetary A indices were 4,
10, 33, 19, 16, 12 and 6, with a mean of 14.3. The estimated
mid-latitude A indices were 1, 7, 15, 14, 14, 9 and 4, with a
mean of 9.1. The monthly averages of daily sunspot numbers for
2010 are 21.3, 31, 25.2, 11.2 and 20. Sunspot group 1072 --
reported in last week’s bulletin -- was visible for nine days,
until May 28. When it was gone on May 29, three new groups
appeared: 1073, 1074 and 1075. On May 29-31, the daily sunspot
numbers were 43, 40 and 39, but geomagnetic indices were high as
well, with the planetary A index