Journal article
Spatial Extent of Quasiperiodic Emissions Simultaneously Observed by Arase and Van Allen Probes on 29 November 2018
Journal of geophysical research. Space physics, Vol.125(9), e2020JA028126
09/01/2020
DOI: 10.1029/2020JA028126
Abstract
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.
Details
- Title: Subtitle
- Spatial Extent of Quasiperiodic Emissions Simultaneously Observed by Arase and Van Allen Probes on 29 November 2018
- Creators
- C. Martinez-Calderon - Nagoya UniversityF. Nemec - Charles UniversityY. Katoh - Tohoku UniversityK. Shiokawa - Nagoya UniversityC. Kletzing - University of IowaG. Hospodarsky - University of IowaO. Santolik - Charles UniversityY. Kasahara - Kanazawa UniversityS. Matsuda - Institute of Space and Astronautical ScienceA. Kumamoto - Tohoku UniversityF. Tsuchiya - Charles UniversityA. Matsuoka - Institute of Space and Astronautical ScienceM. Shoji - Nagoya UniversityM. Teramoto - Kyushu Institute of TechnologyS. Kurita - Kyoto UniversityY. Miyoshi - Nagoya UniversityM. Ozaki - Kanazawa UniversityN. Nishitani - Nagoya UniversityA. V. Oinats - Institute of Solar-Terrestrial PhysicsV. I. Kurkin - Institute of Solar-Terrestrial Physics
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.125(9), e2020JA028126
- Publisher
- Amer Geophysical Union
- DOI
- 10.1029/2020JA028126
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 16
- Grant note
- Czech Academy of Sciences through the Praemium Academiae award JSPS International Research Fellowship JSPS Bilateral Open Partnership Joint Research Projects 17F17030 / Japan Society for the Promotion of Science; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) 18-00844S / GACR Grant 921647; NAS501072 / JHU/APL under NASA's prime
- Language
- English
- Date published
- 09/01/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428777502771
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