NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.37 [2008] >
IJRSP Vol.37(1) [February 2008] >


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

Files in This Item:

File Description SizeFormat
IJRSP 37(1) 46-50.pdf229.33 kBAdobe PDFView/Open
 Current Page Visits: 531 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 557633 since 06-Feb-2009  Last updated on 15-Jul-2014Webmaster: nopr@niscair.res.in