Storm-enhanced plasma density and polar tongue of ionization development during the 15 May 2005 superstorm

Horvath, Ildiko and Lovell, Brain C. (2015) Storm-enhanced plasma density and polar tongue of ionization development during the 15 May 2005 superstorm. Journal of Geophysical Research A: Space Physics, 120 6: 5101-5116. doi:10.1002/2014JA020980

Author Horvath, Ildiko
Lovell, Brain C.
Title Storm-enhanced plasma density and polar tongue of ionization development during the 15 May 2005 superstorm
Journal name Journal of Geophysical Research A: Space Physics   Check publisher's open access policy
ISSN 2169-9402
Publication date 2015-06-01
Sub-type Article (original research)
DOI 10.1002/2014JA020980
Open Access Status Not yet assessed
Volume 120
Issue 6
Start page 5101
End page 5116
Total pages 16
Place of publication Hoboken, NJ, United States
Publisher Wiley-Blackwell Publishing
Language eng
Subject 1908 Geophysics
1910 Oceanography
1107 Forestry
2303 Ecology
1104 Aquatic Science
2312 Water Science and Technology
1111 Soil Science
1906 Geochemistry and Petrology
1904 Earth-Surface Processes
1902 Atmospheric Science
1901 Earth and Planetary Sciences (miscellaneous)
1912 Space and Planetary Science
1911 Palaeontology
Abstract We investigate the ionosphere's global response to the 15 May 2005 superstorm in terms of storm evolution and ionospheric electrodynamics. Our aim is to study the global distribution of plasma and the resultant large-scale ionospheric features including the equatorial ionization anomaly (EIA), storm-enhanced density (SED), and polar tongue of ionization (TOI). We have combined multi-instrument ionospheric data, solar and terrestrial magnetic data, and polar convection maps. Results reveal the prompt penetration of the interplanetary electric field to the polar region and then to the equator with a dusk-to-dawn polarity during the initial phase and with a dawn-to-dusk polarity during the main phase. This drove during the initial phase a weak eastward equatorial electrojet (EEJ) in the American sector at nighttime and a weak westward EEJ in the Indian-Australian sector at daytime. During the main phase, these EEJs intensified and changed polarities. SED and polar TOI development was observed prior to and during the initial phase at evening-premidnight hours over North America and during the main phase in the south at afternoon-evening hours in the Australian sector. During the main phase and early in the recovery phase, the EIA-SED structure was well formed in the Asian longitude sector. Then, polar TOI development was absent in the north because of the long distance from the magnetic pole but was supported in the south because of the closeness of daytime cusp and magnetic pole. Thus, the EIA-SED-TOI structure developed twice but each time in a different longitude sector and with different characteristics.
Keyword Cross-polar cap potential drop
Plasmaspheric erosion
Polar TOI
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID FA2386-14-1-4077
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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