‰ Now 18 WPM transition file follows ‰

Average daily sunspot numbers for the week were up over 12 points to
70R7. What really happened was that for the 7 days of March 30
through April 5, the daily sunspot number at the start of the period
was 35, and it rose to 88 by the seventh day. The next day, April 6,
was the first day of the reporting period for this bulletin, and on
that day the sunspot number rose to 105. The next day it had dropped
way down to 65, then 57, then 46 last Sunday, and by Wednesday,
April 12 it had risen again to 79. Geomagnetic disturbances
accompanied the rising solar activity. A solar wind stream from a
coronal hole met the interplanetary magnetic field, or IMF, which
was pointing south, and this leaves Earth vulnerable. On April 9 the
mid latitude A index was 27 and the K index rose to 4 and 5. The
planetary A index was 39, with the planetary K index reaching 5 and
6. There is a nice peppering of sunspots on the side of the Sun
facing us, but they are small. We could see another period of
geomagnetic disturbance this Saturday. Planetary A index predicted
for the next few days, Thursday, April 13 through Sunday, April 16,
is 10, 25, 40 and 25. The Australian Space Weather Agency sent an
alert on Tuesday advising of a high speed solar wind from a coronal
hole and increased geomagnetic activity on April 15 and 16. Sunspot
numbers may rise again later in the month, perhaps over 100 again.
This is most likely around April 24 through May 4. Sunspot numbers
for April 6 through 12 were 105, 65, 57, 46, 70, 73 and 79 with a
mean of 70R7. 10R7 cm flux was 98R9, 94R5, 91, 89R2, 88R7, 89R7, and
81R1, with a mean of 90R4. Estimated planetary A indices were 10, 3,
5, 39, 18, 5 and 2 with a mean of 11R7.  Estimated mid latitude A
indices were 6, 2, 3, 27, 11, 3 and 1, with a mean of 7R6‚

‰ End of 18 WPM transition file ‰