Longitudinal differences in the equatorial spread F characteristics between Vietnam and Brazil

Author(s)

Hoang, Thai Lan ; Abdu, M. A. ^[1] ; MacDougall, John ^[2] ; Batista, Inez S. ^[1]

Affiliation

^[1] INPE, BR-12245970 Sao Jose Dos Campos - Brazil

^[2] Univ Western Ontario, Dept Phys & Astron, London, ON - Canada

• Document type: Journal article
• Source: Advances in Space Research; v. 45, n. 3, p. 351-360, FEB 1 2010.
• Web of Science Citations: 17

Abstract

We present the results of a comparative study of the equatorial spread F (ESF) and the F layer critical parameter, the base height of the F layer bottomside (h'F) over the two equatorial sites, Ho Chi Minh City - HCM (dip latitude: 2.9 degrees N) in Vietnam and Sao Luis - SL (dip latitude: similar to 2 degrees S) in Brazil. The study utilizes simultaneous data collected by a CADI at HCM and a digisonde at SL during the year 2002 with the monthly mean solar 10.7 cm flux (F10.7) varying from similar to 120 to similar to 185. This study focuses on the quiet time seasonal behavior of the F layer parameters in the two widely separated longitude sectors, and addresses the question as to what can we learn from such comparative studies with respect to the ambient ionospheric and thermospheric parameters that are believed to control the ESF generation and hence its longitudinal occurrence pattern. The observed differences/similarities in the diurnal and seasonal patterns of the F Layer height vis-a-vis the ESF occurrences are evaluated in terms of the known longitudinal differences in the F layer heights, thermospheric meridional winds and the geomagnetic peculiarities of the two sites. (C) 2009 Published by Elsevier Ltd. on behalf of COSPAR. (AU)

• FAPESP's process: 99/00437-0 - Studies of the interactive processes of the equatorial ionosphere-thermosphere system
• Grantee: Mangalathayil Ali Abdu
• Support Opportunities: Research Projects - Thematic Grants