University of Oulu

Yahnin, A. G., Yahnina, T. A., Raita, T., and Manninen, J. (2017), Ground pulsation magnetometer observations conjugated with relativistic electron precipitation, J. Geophys. Res. Space Physics, 122, 9169– 9182, doi:10.1002/2017JA024249

Ground pulsation magnetometer observations conjugated with relativistic electron precipitation

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Author: Yahnin, A. G.1; Yahnina, T. A.1; Raita, T.2;
Organizations: 1Polar Geophysical Institute, Apatity, Russia
2Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.7 MB)
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Language: English
Published: American Geophysical Union, 2017
Publish Date: 2019-09-24


In this report, we investigate the role of electromagnetic ion cyclotron (EMIC) waves in production of relativistic electron precipitation (REP). Over a thousand REP events were detected from four NOAA Polar‐orbiting Operational Environmental Satellites in July–December 2005. Of these, a total of 112 events were conjugated with a ground‐based network of six Finnish induction coil magnetometers and one in Lovozero observatory at Kola Peninsula, Russia. The observation of geomagnetic pulsations during the conjugated events showed that about one third of them were accompanied by pulsations in the Pc1 range, which are the signature of EMIC waves. In fact, the sources of some of these EMIC waves were well outside the location of the REP event. This means that in such cases the REP events were not originated from scattering by EMIC waves. Finally, it is concluded that for this limited set of conjugated events only a quarter might be related to scattering by EMIC waves. The majority of the events are not correlated with EMIC wave signatures in ground‐based observations; they were associated with either no pulsations or noise‐like pulsations PiB and PiC.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 122
Issue: 9
Pages: 9169 - 9182
DOI: 10.1002/2017JA024249
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This study was supported by the Academy of Finland (grant 294931).
Academy of Finland Grant Number: 294931
Detailed Information: 294931 (Academy of Finland Funding decision)
Copyright information: © 2017. American Geophysical Union. All Rights Reserved.