An investigation of the northern hemisphere midlatitude nighttime plasma density enhancements and their relations to the midlatitude nighttime trough during summer

Horvath, Ildiko and Lovell, Brian C. (2009) An investigation of the northern hemisphere midlatitude nighttime plasma density enhancements and their relations to the midlatitude nighttime trough during summer. Journal of Geophysical Research, 114 8: A08308.1-A08308.14. doi:10.1029/2009JA014094

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Author Horvath, Ildiko
Lovell, Brian C.
Title An investigation of the northern hemisphere midlatitude nighttime plasma density enhancements and their relations to the midlatitude nighttime trough during summer
Journal name Journal of Geophysical Research   Check publisher's open access policy
ISSN 0148-0227
Publication date 2009-08-27
Year available 2009
Sub-type Article (original research)
DOI 10.1029/2009JA014094
Volume 114
Issue 8
Start page A08308.1
End page A08308.14
Total pages 14
Editor Robert L. Lysak
Place of publication Washington, DC, United States
Publisher American Geophysical Union
Collection year 2010
Language eng
Subject 020107 Mesospheric, Ionospheric and Magnetospheric Physics
810199 Defence not elsewhere classified
970102 Expanding Knowledge in the Physical Sciences
Formatted abstract
This study has utilized regional surface maps and field-aligned latitudinal profiles derived from multi-instrument DMSP-F15 data. It investigates northern mid-latitude plasma enhancements in the night-time topside ionosphere during summer and their relation to the mid-latitude heavy-ion stagnation trough. The tracked mid-latitude summer enhancements showed significant longitudinal variations. Their best development occurred in the 50oN-60oN/110oE-170oE (geographic) region. Proven by CTIP wind velocity simulations, equatorward winds were strongest there. This region is the northern-hemisphere equivalent of the Weddell Sea Anomaly’s locality. There, northern summer plasma enhancements resembled to the night-time WSA, a southern summer-equinoctial phenomenon, and thus, were named as WSA-like feature. Their plasma density increased mainly due to the mechanical or direct effects of the equatorward winds. However, as results show, the WSA-like feature was an ordinary northern mid-latitude night-time enhancement occurring in summer. This was further confirmed by the WSA-like feature’s relation to the trough and by the trough’s movement. Over the northern hemisphere, the summer trough appeared at (62.461±2.93)oN (geomagnetic), poleward of the WSA-like feature and other mid-latitude plasma enhancements, and moved equatorward with a rate of (0.097±0.04)oN/nT when magnetic activity increased. As our previous WSA investigation indicates, the southern summer trough develops at lower latitudes, at (47.1564±2.16)oS, equatorward of the night-time WSA, and moves poleward with a rate of (0.0497±0.003)oS/nT with increasing magnetic activity under the combined influence of the night-time WSA and South Atlantic Magnetic Anomaly.
Keyword Mid-latitude trough
Northern mid-latitude night-time plasma enhancements
Plasmasphere-ionosphere coupling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article no. A08308

 
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Created: Thu, 05 Nov 2009, 18:29:07 EST by Dr Ildiko Horvath on behalf of School of Information Technol and Elec Engineering