University of Oulu

Manninen, J.; Kleimenova, N.G.; Turunen, T.; Gromova, L.I. Storm-time VLF emissions caused by the solar wind disturbances : a case study on 8 December 2013. Sun and Geosphere, 2017, 12/2: 119 -123

Storm-time VLF emissions caused by the solar wind disturbances : a case study on 8 December 2013

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Author: Manninen, J.1; Kleimenova, N.G.2; Turunen, T.1;
Organizations: 1Sodankyla Geophysical Observatory, Sodankyla, Finland
2Schmidt Institute of the Physics of the Earth RAS, Moscow, Russia
3Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation RAS, Moscow, Troitsk
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201706287522
Language: English
Published: BBC SWS Regional Network, 2017
Publish Date: 2017-06-28
Description:

Abstract

This study is made of temporal variations of the daytime VLF emissions (1-6 kHz) occurred during the moderate magnetic storm (Kp = 6) on 8 December 2013. The storm was associated with the Coronal Mass Ejection (CME). VLF emissions were recorded in the frequency band of 0.2–39 kHz during the dark winter at Kannuslehto (KAN, L ~ 5.5) in Northern Finland. The results were compared with simultaneous variations in the solar wind and Interplanetary Magnetic Field (IMF). It was found that intense VLF chorus started after the pressure jump in solar wind (from 7 to 12 nPa) under the positive IMF Bz. The VLF emissions occurred in two separate frequency bands. The lower frequency (below ~2 kHz) band represents the intense long lasting hiss with right-hand polarization, and in the upper frequency band (above ~2 kHz) the left-hand polarized hiss bursts occurred during about 1 hour. The plasmasphere was strongly compressed, and due to that KAN was mapped outside of the plasmapause. We suppose that VLF chorus exited in the magnetosphere by the cyclotron instability of the radiation belt electrons. The low frequency chorus was generated outside of the plasmapause and arrived to KAN along the direction of N-S meridian. The high-frequency band was generated inside of the plasmasphere arrived to KAN almost along the meridian.

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Series: Sun and Geosphere
ISSN: 1819-0839
ISSN-E: 2367-8852
ISSN-L: 1819-0839
Volume: 12
Issue: 2
Pages: 119 - 123
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
114 Physical sciences
Subjects:
Funding: The paper was partly supported by the Program No 7 of the Presidium of the Russian Academy of Sciences (RAS) and the grant of Academy of Finland
Copyright information: © 2017 BBSCS RN SWS. All rights reserved. Published in this repository with the kind permission of the publisher.