NDLI: Unusual observation of chorus at L=2.6

Content Provider	IEEE Xplore Digital Library
Author	Delport, B. Collier, A.B. Rodger, C.J. Clilverd, M. Parrot, M. Friedel, R. Bortnik, J.
Copyright Year	2011
Description	Author affiliation: School of Physics, University of KwaZulu-Natal, Durban, South Africa (Delport, B.) \|\| Los Alamos National Lab, Los Alamos, USA (Friedel, R.) \|\| Department of Physics, University of Otago, Otago, New Zealand (Rodger, C.J.) \|\| CNRS, LPCE, Orleans, France (Parrot, M.) \|\| Physical Sciences Division, British Antarctic Survey, Cambridge, England (Clilverd, M.) \|\| Hermanus Magnetic Obeservatory, Hermanus, South Africa (Collier, A.B.) \|\| Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, USA (Bortnik, J.)
Abstract	On the $4^{th}$ August 2010, Very Low Frequency (VLF) chorus was observed on Marion Island (L = 2.6). This is a very unusual occurrence as chorus is thought to be generated outside the plasmapause, which would only extend to such low L during periods of severe geomagnetic activity. A similar event was observed at Palmer Station, Antarctica (L = 2.44) during the Halloween storms of 2003. The 2003 event had a minimum Dst of around −350nT, while the 2010 event occurred after a significantly smaller storm (Dst ∼ −70nT). A further difference is that the 2003 event occurred during solar maximum, while the 2010 event occurred during a period where the Sun had been unusually inactive. The spatial extent of the 2010 event is discussed, and data from a broadband VLF ground receiver is presented. Empirical plasmapause location models reveal that Marion Island was just within the plasmasphere at the time of the event. Preliminary analysis of low resolution VLF data from another high latitude station shows that a similar emission was observed at that site, but at a slightly later universal time, which indicates that the generation region was moving. This movement is likely linked to the eastward drift of electrons, and also possibly to the plasmapause relaxing to its quiet time position.
Starting Page	1
Ending Page	4
File Size	8949209
Page Count	4
File Format	PDF
ISBN	9781424451173
e-ISBN	9781424460519
DOI	10.1109/URSIGASS.2011.6051078
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	Earth Storms Resonant frequency Belts Antarctica Magnetosphere
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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