Spatial Extent of Quasiperiodic Emissions Simultaneously Observed by Arase and Van Allen Probes on 29 November 2018

0539562 - ÚFA 2021 RIV US eng J - Journal Article
Martinez-Calderon, C. - Němec, F. - Katoh, Y. - Shiokawa, K. - Kletzing, C. - Hospodarsky, G. - Santolík, Ondřej - Kasahara, Y. - Matsuda, S. - Kumamoto, A. - Tsuchiya, F. - Matsuoka, A. - Shoji, M. - Teramoto, M. - Kurita, S. - Miyoshi, Y. - Ozaki, M. - Nishitani, N. - Oinats, A. V. - Kurkin, V. I.
Spatial Extent of Quasiperiodic Emissions Simultaneously Observed by Arase and Van Allen Probes on 29 November 2018.
Journal of Geophysical Research-Space Physics. Roč. 125, č. 9 (2020), č. článku e2020JA028126. ISSN 2169-9380. E-ISSN 2169-9402
Grant - others:AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:68378289
Keywords : VLF * ELF * spatial extent * conjugated events * ERG * RBSP * quasiperiodic emissions
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.811, year: 2020
Method of publishing: Limited access
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JA028126

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.
Permanent Link: http://hdl.handle.net/11104/0317323