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Title: Response of ionospheric foF2 over south east Asian sector to geomagnetic storm of 29 October 1973
Authors: David, T W
Chukwuma, V U
Keywords: Geomagnetic storm;Moderate storm;Solar wind;Auroral electrojet index;Ionospheric storm response;Interplanetary magnetic field;Magnetic index (Dst)
Issue Date: Jun-2012
Publisher: NISCAIR-CSIR, India
PACS No.: 94.20.Vv; 96.50.Bh
Abstract: The auroral electrojet (AE) index was employed for the study of the ionospheric response to the geomagnetic storm of 29 October 1973. The interplanetary magnetic field (IMF) component, Bz, and the low latitude magnetic index, Dst, show that the event is a moderate (Dst = -64 nT, Bz = -5.8 nT) storm. The analysis from the disturbances in ionospheric foF2 during 29-31 October 1973 shows predominantly an enhancement (positive storm) at the mid and low latitude stations. In between the time of storm (14:00 hrs UT on 29 October and 05:00 hrs UT on 30 October), the upper latitudes also show some degree of enhancement. This paper concludes that the reason for the observed positive ionospheric storm over all latitudes under investigation could be due to injection of energy from the solar wind into the auroral region as a result of significant increase in the AE index which causes an uplift of the ionospheric layers to higher altitudes, where the recombination rate is small. Furthermore, this paper confirms the argument that moderate magnetic storms are capable of generating ionospheric storms which are of comparable magnitude with those resulting from intense geomagnetic storms.
Page(s): 332-338
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.41(3) [June 2012]

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