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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.39 [2010] >
IJRSP Vol.39(2) [April 2010] >
| Title: | Geomagnetic observations and ionospheric response during storm on 14 April 2006 |
| Authors: | Bakare, N O
Chukwuma, V U
Adekoya, B J |
| Keywords: | Geomagnetic storm
F2 region critical frequency (foF2) depletion
Interplanetary magnetic field
F2 layer peak height (hmF2) variation
Low latitude index Dst
Solar wind flow speed
Ion number density
Proton temperature |
| Issue Date: | Apr-2010 |
| Publisher: | CSIR |
| PACS No.: | 94.20.Vv; 94.20.dj |
| Abstract: |
A study of the intense geomagnetic storm on
14 April 2006 has been done using ionospheric data obtained from ionosonde
station located in the American sector. The results indicate appearance of
positive storm before the beginning of geomagnetic disturbance in the mid
latitudes and occurrence of strong negative phase at the equator. It was
observed that magnetospheric process, responsible for Dst decrease, was the enhancement
of the plasma sheet and appeared to be caused by the combined effect of large
intense proton density at 1400 hrs UT, southward turning of Bz at 1800 hrs UT
and enhancement of speed stream at 1400 hrs UT on 13 April. The ionosonde
stations located at American sectors are: College (64.9°N), Gakoma (62.4°N), Goose
bay (53.3°N), Boulder
(40.0°N), Dyess (32.2°N), Eglin AFB (30.4°N) and Puerto Rico (18.5°N). The present results were obtained using critical frequency foF2.
The peak height of F2 layer hmF2 showed that the stations had some degree of simultaneity
in the depletion of foF2 between 2000 hrs UT on 14 April and 0100 hrs UT on
15 April and that of hmF2 between 1600 and 1900 hrs UT on 15 April.
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| Page(s): | 71-79 |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.39(2) [April 2010]
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