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Title: Influence of IMF Bz on the variability of the minimum value of fo-F2
Authors: Vijayakrishnan, M V
Sreehari, C V
Mathew, Tiju Joseph
Nayar, S R Prabhakaran
Keywords: Interplanetary magnetic field (IMF);IMF Polarity;Critical frequency;Critical frequency;Ionospheric critical frequency
Issue Date: Feb-2008
Publisher: CSIR
Abstract: 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.
Page(s): 46-50
ISSN: 0367-8393
Appears in Collections:IJRSP Vol.37(1) [February 2008]

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