[W4HM Spaceweather] W4HM Discussion Of Daily Solar Space And Geomagnetic Weather

Thomas F Giella W4HM w4hm at tampabay.rr.com
Thu Feb 21 08:36:23 EST 2013


For Wednesday February 20, 2013

Solar activity is low as far as the emergence of the number of new sunspot 
groups. Currently there is 1 new un-numbered sunspot group and 6 existing 
numbered sunspot groups.

Solar activity is high as far as the number of solar flares, 11 occurred. 
The largest solar flare in magnitude was a small in size C8.2, which 
occurred at approximately N08W46 and associated with sunspot group #11678. 
#11678 has a delta twisted magnetic signature capable of producing large M 
class solar flares.

The daily solar flux index (SFI) has been at or above 100 for 21 consecutive 
days, currently at 114.9.

The daily sunspot number (SSN) has been at or above 100 for 2 consecutive 
days, currently (NOAA) at 106. Unfortunately though it appears that the 
daily SSN may drop below 100 again in the next day or two.

With the daily SSN above 100 that means that there will be some east-west F2 
layer radio wave propagation openings in the northern hemisphere. On 
Wednesday February 20, 2013 from Florida on 10 meters I made 10 east-west F2 
layer contacts on the digital mode JT9-1 into Europe and central and east 
Asia with only 5 watts.

The geomagnetic field was quiet for 2 consecutive days with the Kp 
(planetary) index in the 0-2 range. As collected by Potsdam Germany WDC the 
3 hour Kp (planetary) intervals were 11222211. As collected by NOAA/SWPC the 
3 hour Kp (planetary) intervals were 11122221.

The Dst ranged between -1 and -23.

Via SOHO the maximum and minimum solar wind values were 338-420.

Via NOAA the maximum background x-ray solar flux value was B3.2.

For the latest solar, space & geomagnetic weather data go to 
http://www.wcflunatall.com/nz4o2.htm . For an explanation of how the above 
indices affect MF, HF and VHF radio wave propagation go to 
http://www.wcflunatall.com/nz4o5.htm .

To subscribe to the W4HM Daily MF/HF/6M Radio Wave Propagation Forecast 
Subscription Service go to http://www.wcflunatall.com/propagation.htm or 
http://www.solarcycle24.org .

73 & GUD DX,
Thomas F. Giella, W4HM
Lakeland, FL, USA
w4hm at tampabay.rr.com

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