Positive and negative ionospheric storms occurring during the 15 May 2005 geomagnetic superstorm

Horvath, Ildiko and Lovell, Brian C. (2015) Positive and negative ionospheric storms occurring during the 15 May 2005 geomagnetic superstorm. Journal of Geophysical Research A: Space Physics, 120 9: 7822-7837. doi:10.1002/2015JA021206

Author Horvath, Ildiko
Lovell, Brian C.
Title Positive and negative ionospheric storms occurring during the 15 May 2005 geomagnetic superstorm
Journal name Journal of Geophysical Research A: Space Physics   Check publisher's open access policy
ISSN 2169-9380
Publication date 2015-09-01
Sub-type Article (original research)
DOI 10.1002/2015JA021206
Volume 120
Issue 9
Start page 7822
End page 7837
Total pages 16
Place of publication Hoboken, NJ United States
Publisher Wiley-Blackwell Publishing
Collection year 2016
Language eng
Formatted abstract
This study focuses on the 15 May 2005 geomagnetic superstorm and aims to investigate the global variation of positive and negative storm phases and their development. Observations are provided by a series of global total electron content maps and multi-instrument line plots. Coupled Thermosphere-Ionosphere-Plasmasphere electrodynamics (CTIPe) simulations are also employed. Results reveal some sunward streaming plumes of storm-enhanced density (SED) over Asia and a well-developed midlatitude trough over North America forming isolated positive and negative storms, respectively. The simultaneous development of positive and negative storms over North America is also shown. Then, some enhanced auroral ionizations maintained by strong equatorward neutral winds appeared in the depleted nighttime ionosphere. Meanwhile, the northern nighttime polar region became significantly depleted as the SED plume plasma could not progress further than the dayside cusp. Oppositely, a polar tongue of ionization (TOI) developed in the daytime southern polar region. According to CTIP simulations, solar heating locally maximized (minimized) over the southern (northern) magnetic pole. Furthermore, strong upward surges of molecular-rich air created O/N2 decreases both in the auroral zone and in the trough region, while some SED-related downward surges produced O/N2 increases. From these results we conclude for the time period studied that (1) composition changes contributed to the formation of positive and negative storms, (2) strengthening polar convection and increasing solar heating of the polar cap supported polar TOI development, and (3) a weaker polar convection and minimized solar heating of the polar cap aided the depletion of polar plasma.
Keyword CTIP/CTIPe simulations
Lonospheric storms
Midlatitude trough
Polar TOI
SED plume
Thermospheric composition
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Information Technology and Electrical Engineering Publications
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