Abstract:
The data collected by the ground based GPS-SCINDA receiver located at Bahir
Dar( )11.6° N, 37.38
0
E) have been analyzed to study the response of ionospheric
scintillation
and TEC for geomagnetic storm of 6 April 2010, 29 May 2010 and 11
October 2010. Dst, Kp, Bz and AE indices used test the geomagnetic activity effect on
the generation of ionospheric irregularities producing scintillation. It is found that the
TEC value is highly influenced by geomagnetic storm. 'When the geomagnetic storm
days TEC compared to quite day TEC on 9 April 2010 TEC is greater. The maximum
scintillation recorded magnetic
storm day is greater than the quite days. This indicates
that relatively high scintillation activities started from about 17 UT up to the local
midnight period
is occurred. When the geomagnetic storm days TEC compared to
quite day on 1 June 2010 TEC is greater. A negative storm effect is seen on 29 may
2010
and a positive storm effect is seen on 1 June 2010. The maximum scintillation
recorded magnetic
storm day is less than the quite days. This indicates that relatively
high scintillation activities
started from about 3UT-6UT on 1 June 2010 and from
2
June 2010 18UT up to mid night period is occurred. In this case the scintillation
has no clear relation ship with magnetic storm. Their is minimum TEC recorded
during main phase of the storm time(9.65 TECU) when compared to TEC in quit
day with value 12.62
TECU on 7 October 2010 and 13.52 TECU on 14 October 2010.
A slight negative effect of
the storm has been observed during 11 October 2010. The
scintillation observed during quite days, on 26 October 2010 and 14 October 2010
which is
greater than the scintillation observed during geomagnetic storm day.
Key words: Ionosphere, Geomagnetic storm, scintillation, TEC.
