Abstract:
The characteristics of the ionospheric storm of 4-6 Dec. 1958 in the
Indian sector (60-85°B) are studied using published data from ten
ionospheric stations distributed from high mid latitudes to dip equator.
It is shown that in the electrojet region, besides the well known positive
effects in 10F2 due to a weakening of the electrojet, negative effects in
10 F2 with prominent increases in height of F2-layer also occurred during
this particular storm. It is suggested that changes in atmospheric neutral
composition (i.e. increased N2/o and 02/0 ratios) arc the basic causes of
the negative effects in 10 F2 in the electrojet region noticed for this
storm.
