Hemispheric, seasonal and latitudinal dependence of storm-time ionosphere during low solar activity period

Adekoya, B.J. and Adebesin, B.O. (2014) Hemispheric, seasonal and latitudinal dependence of storm-time ionosphere during low solar activity period. Advances in Space Research, 54 (11). pp. 2184-2193. ISSN 02731177

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Official URL: http://dx.doi.org/10.1016/j.asr.2014.08.013

Abstract

Analysis of the seasonal, hemispheric and latitudinal variation of the ionospheric F2 peak during the disturbed condition of 2011, a year of low solar activity had been studied over the low- and mid-latitude stations, using hourly data obtained from National Geophysical Data Center. Standard deviation tool was used in the analysis for better approximation of electron density variation. Our results showed an enhancement in F2 maximum electron density (NmF2) at daytime over the low latitude. For the mid-latitude stations, NmF2 depletion pre-dominates the daytime and overturned at nighttime. In general, the variation in terms of magnitude is higher in the low-latitude than at mid-latitude. The nighttime decrease in NmF2 is accompanied by a corresponding F2 peak height (hmF2) increase and overturned at daytime. The hmF2 response during the equinoctial months is lower than the solstices. NmF2 shows distinct seasonal, hemispheric and latitudinal dependence in its response. Appearance of a significant ionospheric effect in southern hemisphere is higher than in the northern hemisphere, and is more pronounced in the equinoxes at low latitude. At mid-latitudes, ionospheric effect is insignificant at both hemispheres. A negative ionospheric response dominates the whole seasons at the mid-latitude except for March equinox. The reverse is the case for the hmF2 observation. The amplitude of both the NmF2 and hmF2 increases with increasing latitude and maximizes in the southern hemisphere in terms of longitude.

Item Type: Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Depositing User: DR. B. OLUFEMI ADEBESIN
Date Deposited: 12 Jun 2015 20:25
Last Modified: 12 Jun 2015 20:25
URI: http://eprints.lmu.edu.ng/id/eprint/218

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