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Spatial Extent of Quasiperiodic Emissions Simultaneously Observed by Arase and Van Allen Probes on 29 November 2018
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SYSNO ASEP 0539562 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Spatial Extent of Quasiperiodic Emissions Simultaneously Observed by Arase and Van Allen Probes on 29 November 2018 Author(s) Martinez-Calderon, C. (JP)
Němec, F. (CZ)
Katoh, Y. (JP)
Shiokawa, K. (JP)
Kletzing, C. (US)
Hospodarsky, G. (US)
Santolík, Ondřej (UFA-U) RID, ORCID
Kasahara, Y. (JP)
Matsuda, S. (JP)
Kumamoto, A. (JP)
Tsuchiya, F. (CZ)
Matsuoka, A. (JP)
Shoji, M. (JP)
Teramoto, M. (JP)
Kurita, S. (JP)
Miyoshi, Y. (JP)
Ozaki, M. (JP)
Nishitani, N. (JP)
Oinats, A. V. (RU)
Kurkin, V. I. (RU)Number of authors 20 Article number e2020JA028126 Source Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 125, č. 9 (2020)Number of pages 16 s. Language eng - English Country US - United States Keywords VLF ; ELF ; spatial extent ; conjugated events ; ERG ; RBSP ; quasiperiodic emissions Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Limited access Institutional support UFA-U - RVO:68378289 UT WOS 000600989000025 EID SCOPUS 85092603176 DOI 10.1029/2020JA028126 Annotation Recent availability of a considerable amount of satellite and ground-based data has allowed us to analyze rare conjugated events where extremely low and very low frequency waves from the same source region are observed in different locations. Here, we report a quasiperiodic (QP) emission, showing one-to-one correspondence, observed by three satellites in space (Arase and the Van Allen Probes) and a ground station. The main event was on 29 November 2018 from 12:06 to 13:08 UT during geomagnetically quiet times. Using the position of the satellites we estimated the spatial extent of the area where the one-to-one correspondence is observed. We found this to be up to 1.21 Earth's radii by 2.26 hr MLT, in radial and longitudinal directions, respectively. Using simple ray tracing calculations, we discuss the probable source location of these waves. At similar to 12:20 UT, changes in the frequency sweep rate of the QP elements are observed at all locations associated with magnetic disturbances. We also discuss temporal changes of the spectral shape of QP observed simultaneously in space and on the ground, suggesting the changes are related to properties of the source mechanisms of the waves. This could be linked to two separate sources or a larger source region with different source intensities (i.e., electron flux). At frequencies below the low hybrid resonance, waves can experience attenuation and/or reflection in the magnetosphere. This could explain the sudden end of the observations at the spacecraft, which are moving away from the area where waves can propagate. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2021 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JA028126
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