NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.35 [2006] >
IJRSP Vol.35(1) [February 2006] >


Title: Signature of midnight temperature maximum (MTM) using OI 630 nm airglow
Authors: Mukherjee, G K
Parihar, Navin
Niranjan, K
Manju, G
Keywords: Meridional wind
Midnight temperature maximum
630 nm airglow
Ionosphere collapse
Issue Date: Feb-2006
Publisher: CSIR
Abstract:  An anomalous behaviour of F-region neutral temperature at night, sometimes exceeding the maximum afternoon values has been recorded at equatorial latitudes. This feature is referred to as Midnight Temperature Maximum (MTM)1. The winds generated due to pressure bulge phenomena at the equator propagate polewards (northward) and its vertical component while propagating moves the F-region plasma downwards to a region of enhanced loss and airglow production. The optical signature of MTM phenomena (brightness wave) has been recorded at Kolhapur (16.8 °N, 74.2 °E, dip lat. 10.6 ºN) in India using OI 630 nm night airglow during December 2002 to April 2003 showing peaks in intensity around 0200–0400 hrs LT. The structures were prominent for about two to three hours. The digital ionosonde data of Trivandrum (8.5 ºN, 77.0 ºE, dip ~ 0.6 °S), Sriharikota (13.7 °N, 80.2 °E; dip ~ 10.5 °N) and Visakhapatnam (17.67 ºN, 83.32 ºE; dip ~ 20 °N) stations show the descent of the F-layer at all the low latitude stations during MTM disturbance. The meridional winds estimated from h'F data of Trivandrum and Sriharikota showed generation of poleward winds and time delay of about one-and-a-half hours was observed between the observed time of the descent of the layer (h'F) at Sriharikota and the time of observations of the signature of MTM phenomena at Kolhapur.
Page(s): 14-21
ISSN: 0367-8393
Source:IJRSP Vol.35(1) [February 2006]

Files in This Item:

File Description SizeFormat
IJRSP 35(1) 14-21.pdf526.74 kBAdobe PDFView/Open
 Current Page Visits: 585 
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: 559519 since 06-Feb-2009  Last updated on 30-Jul-2014Webmaster: nopr@niscair.res.in