Record Details


Field	Value

Title	Influence of IMF Bz on the variability of the minimum value of fo-F2

Creator	Vijayakrishnan, M V Sreehari, C V Mathew, Tiju Joseph Nayar, S R Prabhakaran

Subject	Interplanetary magnetic field (IMF) IMF Polarity Critical frequency Critical frequency Ionospheric critical frequency

Description	46-50 The critical frequency of the ionosphere, apart from the diurnal and annual variations exhibit day-to-day variations. The minimum value of fo-F2 around the pre-sunrise period also has a day-to-day change. In this work, the relation between the magnitude of fo-F2 minimum and h′F2 values around the pre-sunrise period and their relation with the sign of the north-south component of the interplanetary magnetic field (IMF) is investigated. The minimum value of fo-F2 for each day is found to be related to the IMF north-south component, with the fo-F2 value tending to be larger when the IMF is northward and smaller when the IMF is southward. The northward IMF Bz is seen to produce an eastward electric field at the ionosphere and move the ionospheric plasma to higher altitudes resulting in higher critical frequencies. Whereas a southward IMF Bz produce a westward electric field and move the ionospheric plasma to lower altitudes resulting in lower critical frequencies.

Date	2008-12-05T05:43:29Z 2008-12-05T05:43:29Z 2008-02

Type	Article

Identifier	0367-8393 http://hdl.handle.net/123456789/2481

Language	en_US

Publisher	CSIR

Source	IJRSP Vol.37(1) [February 2008]

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