NDLI: An investigation of ionospheric disturbances over South Africa during the magnetic storm on 15 May 2005

Content Provider	IEEE Xplore Digital Library
Author	Ngwira, C.M. McKinnell, L.A. Cilliers, P.J. Yizengaw, E. Opperman, B.D.L.
Copyright Year	2011
Description	Author affiliation: Hermanus Magnetic Observatory, Hermanus, South Africa (Cilliers, P.J.; Opperman, B.D.L.) \|\| Institute of Scientific Research, Boston College, Boston, USA (Yizengaw, E.) \|\| Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa (Ngwira, C.M.; McKinnell, L.A.)
Abstract	The effects of the 15 May 2005 severe geomagnetic storm on the South African ionosphere are studied using ground-based and satellite observations. Ionospheric disturbances have less frequently been investigated over mid-latitude regions. Recently, a number of studies investigated their evolution and generation over these regions. This paper reports on the first investigation of travelling ionospheric disturbances (TIDs) over mid-latitude South Africa. Using Global Positioning System (GPS)-derived total electron content (TEC) variations from the South African network of dual frequency GPS receivers, we were able to examine the effects of the disturbance on the quiet-time TEC. Two TEC enhancements were observed at low- and mid-latitudes: the first observed between 30–45°S geomagnetic latitudes associated with equatorward neutral winds and the passage of a TID, and the second TEC enhancement associated with a second TID. In addition, the F-region critical frequency (foF2) values observed at two ionosonde stations show that the ionospheric response as seen by ionosondes was different from that of the TEC response during the disturbance period. The dissimilarity between the TEC and the foF2 suggests that two competing drivers existed, i.e., the westward electric field and equatorward neutral wind effects.
Starting Page	1
Ending Page	2
File Size	89168
Page Count	2
File Format	PDF
ISBN	9781424451173
e-ISBN	9781424460519
DOI	10.1109/URSIGASS.2011.6050971
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-13
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Storms Atmospheric modeling Ionospheric disturbances Travelling ionospheric disturbances Space exploration Total electron content Atmospheric waves Ionosphere Global Positioning System
Content Type	Text
Resource Type	Article

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