A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry

Horvath, Ildiko (2006) A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry. Journal of Geophysical Research, 111 12: A12317.1-A12317.17.


Author Horvath, Ildiko
Title A total electron content space weather study of the Nighttime Weddell Sea Anomaly of 1996/97 southern summer with TOPEX/Poseidon radar altimetry
Journal name Journal of Geophysical Research   Check publisher's open access policy
ISSN 0148-0227
2156-2202
Publication date 2006-12
Sub-type Article (original research)
DOI 10.1029/2006JA011679
Volume 111
Issue 12
Start page A12317.1
End page A12317.17
Total pages 17
Editor J. Mutter
P. Taylor
R. Arculus
Place of publication Washington DC, United States
Publisher American Geophysical Union
Collection year 2006
Language eng
Subject C1
260603 Ionospheric and Magnetospheric Physics
280301 Programming Techniques
610100 - Defence
700300 Communication Services
Abstract This paper reports on a total electron content space weather study of the nighttime Weddell Sea Anomaly, overlooked by previously published TOPEX/Poseidon climate studies, and of the nighttime ionosphere during the 1996/1997 southern summer. To ascertain the morphology of spatial TEC distribution over the oceans in terms of hourly, geomagnetic, longitudinal and summer-winter variations, the TOPEX TEC, magnetic, and published neutral wind velocity data are utilized. To understand the underlying physical processes, the TEC results are combined with inclination and declination data plus global magnetic field-line maps. To investigate spatial and temporal TEC variations, geographic/magnetic latitudes and local times are computed. As results show, the nighttime Weddell Sea Anomaly is a large (∼1,600(°)2; ∼22 million km2 estimated for a steady ionosphere) space weather feature. Extending between 200°E and 300°E (geographic), it is an ionization enhancement peaking at 50°S–60°S/250°E–270°E and continuing beyond 66°S. It develops where the spacing between the magnetic field lines is wide/medium, easterly declination is large-medium (20°–50°), and inclination is optimum (∼55°S). Its development and hourly variations are closely correlated with wind speed variations. There is a noticeable (∼43%) reduction in its average area during the high magnetic activity period investigated. Southern summer nighttime TECs follow closely the variations of declination and field-line configuration and therefore introduce a longitudinal division of four (Indian, western/eastern Pacific, Atlantic). Northern winter nighttime TECs measured over a limited area are rather uniform longitudinally because of the small declination variation. TOPEX maps depict the expected strong asymmetry in TEC distribution about the magnetic dip equator.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article no. A12317

 
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