NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.39 [2010] >
IJRSP Vol.39(4) [August 2010] >

Title: Diurnal and seasonal variation of fading rates of E- and F- region echoes during IGY and IQSY at the equatorial station of Ibadan
Authors: Somoye, E O
Keywords: Ionospheric irregularities
Radio echoes
Fading rate
Diurnal variation
Seasonal variation
Vertical drift
East-West drift
Issue Date: Aug-2010
Publisher: CSIR
PACS No.: 94.20.Vv; 94.20.dg;
Abstract:  Fading rates of E- and F-region echoes observed at Ibadan (7.4°N, 3.9°E, 6°S dip) during the International Geophysical Year (IGY) 1958 and the International Quiet Year of the Sun (IQSY) 1964 are investigated for diurnal and seasonal variations. The fading rates of E- and F-region echoes are found to be of the same order of magnitude during the IQSY. However, the same is not true during IGY indicating that fading of F-region echoes is dependent on solar activity while that of E-region echoes is not as fading rate of E-region echoes are about the same during both epochs. The fading rate is found to be maximum at noon and minimum at sunrise and sunset for E-region echoes during both epochs and for F-region echoes during IQSY. During IGY, fading rate is maximum at noon; and minimum at sunrise and 2000 hrs LT (i.e. post sunset) at both epochs and for the two regions about same times of reversal of F-region East-West (EW) and E×B vertical drift during solar maximum. The maximum at noon appears to be due to: (i) continuous daytime rise in hmF2 which enhances irregularities and (ii) spread F irregularities generated by sudden increase in E×B plasma uplift not seen by the close-spaced antenna technique used in the present study. F-region fading rate is maximum during December solstice while E-region fading rates show no seasonal variation.
Page(s): 194-202
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.39(4) [August 2010]

Files in This Item:

File Description SizeFormat
IJRSP 39(4) 194-202.pdf1.37 MBAdobe PDFView/Open
 Current Page Visits: 908 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  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 © 2015 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: 162785 since 01-Sep-2015  Last updated on 21-Jun-2016Webmaster: