Very Low Frequency Whistler Mode Wave Events Observed Simultaneously by the Kannuslehto Station and Van Allen Probes

B. Bezdekova; F. Nemec; J. Manninen; O. Santolik; G. B. Hospodarsky; W. S. Kurth

doi:10.1029/2022JA031078

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Very Low Frequency Whistler Mode Wave Events Observed Simultaneously by the Kannuslehto Station and Van Allen Probes

Journal article

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Very Low Frequency Whistler Mode Wave Events Observed Simultaneously by the Kannuslehto Station and Van Allen Probes

B. Bezdekova, F. Nemec, J. Manninen, O. Santolik, G. B. Hospodarsky and W. S. Kurth

Journal of geophysical research. Space physics, Vol.128(1), e2022JA031078

01/01/2023

DOI: 10.1029/2022JA031078

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Abstract

Events characterized by substantial intensity enhancements in the frequency range between about 1.5 and 4 kHz in the measurements of the ground-based Kannuslehto station, Finland are analyzed. Altogether, as many as 465 events are identified in the Kannuslehto data measured during the campaigns between December 2012 and October 2019. It is shown that the events usually last for several hours and they occur preferentially on the dawn side during geomagnetically active periods. Simultaneous measurements performed by the Van Allen Probes spacecraft are used to reveal the L-shells and magnetic local times where a corresponding intensity increase occurs in space. A backward ray tracing analysis is further employed to investigate the wave propagation between the tentative source region and the ground. Wave normal angles of waves eventually detectable at Kannuslehto are determined and compared with those obtained from a detailed wave analysis. Either a wave ducting, propagation in the Earth-ionosphere waveguide, or their combination seem to be needed for the waves to reach Kannuslehto.

Physical Sciences

Astronomy & Astrophysics

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Details

Title: Subtitle: Very Low Frequency Whistler Mode Wave Events Observed Simultaneously by the Kannuslehto Station and Van Allen Probes
Creators: B. Bezdekova - Charles University
F. Nemec - Charles University
J. Manninen - Sodankyla Geophys Observ, Sodankyla, Finland
O. Santolik - Charles University
G. B. Hospodarsky - University of Iowa
W. S. Kurth - University of Iowa
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.128(1), e2022JA031078
DOI: 10.1029/2022JA031078
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 12
Grant note: GACR; Grant Agency of the Czech Republic
Language: English
Date published: 01/01/2023
Academic Unit: Physics and Astronomy
Record Identifier: 9984455263202771

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