[3] The morphological analysis was made for Huancayo
( j = 12.0 oS;
l = 284.7 oE;
I=1.3 )
and Kodaikanal
( j = 10.2 oN;
l = 77.5 oW;
I=2.6 )
over all available years of observations,
(1957-1989) and (1957-1987)
for the two stations,
respectively. Following to the method by MDL a 27-day
NmF2 running median centered to the day in question
rather than usual monthly median was used for the
Q disturbances analysis. The advantages of using the 27-day
median were discussed by MDL. In our analysis,
Q disturbances were referred to hourly
( NmF2/NmF2 med -1 )
deviations more than 40% if all 3-hour ap indices were
7
for 24 previous hours. Normally, this provides a selection
of quiet time periods (MDL). Three levels of solar activity
were considered using 12-month running mean sunspot
number: solar minimum
R12 < 50, medium
R12 = 50-100,
and maximum
R12 > 100.
Citation: 2005), Quiet time F2-layer disturbances at geomagnetic equator, Int. J. Geomagn. Aeron., 5, GI3001, doi:10.1029/2004GI000071.
Copyright 2005 by the American Geophysical Union (