Multievent Study of Characteristics and Propagation of Naturally Occurring ELF/VLF Waves Using High‐Latitude Ground Observations and Conjunctions With the Arase Satellite

0539564 - ÚFA 2022 RIV US eng J - Článek v odborném periodiku
Martinez-Calderon, C. - Katoh, Y. - Manninen, J. - Santolík, Ondřej - Kasahara, Y. - Matsuda, S. - Kumamoto, A. - Tsuchiya, F. - Matsuoka, A. - Shoji, M. - Teramoto, M. - Shinohara, I. - Shiokawa, K. - Miyoshi, Y.
Multievent Study of Characteristics and Propagation of Naturally Occurring ELF/VLF Waves Using High‐Latitude Ground Observations and Conjunctions With the Arase Satellite.
Journal of Geophysical Research-Space Physics. Roč. 126, č. 2 (2021), č. článku e2020JA028682. ISSN 2169-9380. E-ISSN 2169-9402
Grant ostatní: AV ČR(CZ) AP1401; AV ČR(CZ) JSPS-19-05
Program: Akademická prémie - Praemium Academiae; Bilaterální spolupráce
Institucionální podpora: RVO:68378289
Klíčová slova: Arase * conjugated event * ERG * ionospheric exit point * VLF * whistler * mode waves
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 3.111, rok: 2021
Způsob publikování: Omezený přístup
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020JA028682

We report the properties of the ionospheric exit point and characteristics of several types of very low frequency waves, including chorus and quasiperiodic emissions, based on a comprehensive dataset of simultaneous observations between ground and space. Whistler‐mode waves were observed at Kannuslehto (L = 5.5, KAN), Finland, and in the inner magnetosphere by the Japanese Arase satellite. During the 2017–2018 winter campaign, we found 13 cases showing one‐to‐one correspondence of wave spectra between KAN and Arase. This is the first time that such a large number of conjugated events have been reported at once. The duration of the events ranged from a few minutes up to 3 h, with 90% of events detected in the afternoon sector. While the occurrence rate is higher during daytime, this can also be related to a majority of the detected waves being quasiperiodic emissions, a known dayside phenomenon. Arase was usually located within 30° of the equator, at L ∼4–5, and detected mostly waves propagating at oblique angles (≥20°). Frequently, the ionospheric magnetic footprint of Arase was located equatorwards (south) from KAN, often in the same geographical area. We investigated the probable location of the ionospheric exit point of the waves from the location of the footprint of Arase and the angle of arrival of waves detected at KAN. Using density measurements at Arase we discuss magnetospheric wave propagatio: we find that, in most cases, waves were unducted in their propagation from the satellite to the ground.
Trvalý link: http://hdl.handle.net/11104/0317345