Variation of Whistler-Mode Wave Characteristics Along Magnetic Field Lines: Comparison of Near-Equatorial THEMIS and Middle-Latitude ERG Observations
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arXiv
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| Format: | Preprint |
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2024
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| author | Kadan, Sophie Zhang, Xiao-Jia Artemyev, Anton Miyoshi, Yoshizumi Matsuoka, Ayako Kasahara, Yoshiya Matsuda, Shoya Hori, Tomoaki Teramoto, Mariko Yamamoto, Kazuhiro Shinohara, Iku |
| author_facet | Kadan, Sophie Zhang, Xiao-Jia Artemyev, Anton Miyoshi, Yoshizumi Matsuoka, Ayako Kasahara, Yoshiya Matsuda, Shoya Hori, Tomoaki Teramoto, Mariko Yamamoto, Kazuhiro Shinohara, Iku |
| contents | The latitudinal distribution of whistler-mode wave intensity plays a crucial role in determining the efficiency and energy of electrons scattered by these waves in the outer radiation belt. Traditionally, this wave property has mostly been derived from statistical measurements of off-equatorial spacecraft, which collect intensity data at various latitudes under different geomagnetic conditions and at different times. In this study we examine a set of events captured by both the near-equatorial THEMIS spacecraft and the off-equatorial ERG spacecraft. Specifically, we compare the whistler-mode wave intensity from THEMIS and ERG measurements at the same MLT and time sectors. Similar wave spectrum characteristics confirm that THEMIS and ERG indeed observed the same wave activity. However, upon closer examination of the wave intensity variations, we identify two distinct categories of events: those that follow the statistically predicted variations in wave intensity along magnetic latitudes, and those that exhibit rapid wave intensity decay away from the equatorial plane. We analyze main characteristics of events from both categories and discuss possible implications of our analysis for radiation belt models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_09900 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Variation of Whistler-Mode Wave Characteristics Along Magnetic Field Lines: Comparison of Near-Equatorial THEMIS and Middle-Latitude ERG Observations Kadan, Sophie Zhang, Xiao-Jia Artemyev, Anton Miyoshi, Yoshizumi Matsuoka, Ayako Kasahara, Yoshiya Matsuda, Shoya Hori, Tomoaki Teramoto, Mariko Yamamoto, Kazuhiro Shinohara, Iku Space Physics Plasma Physics The latitudinal distribution of whistler-mode wave intensity plays a crucial role in determining the efficiency and energy of electrons scattered by these waves in the outer radiation belt. Traditionally, this wave property has mostly been derived from statistical measurements of off-equatorial spacecraft, which collect intensity data at various latitudes under different geomagnetic conditions and at different times. In this study we examine a set of events captured by both the near-equatorial THEMIS spacecraft and the off-equatorial ERG spacecraft. Specifically, we compare the whistler-mode wave intensity from THEMIS and ERG measurements at the same MLT and time sectors. Similar wave spectrum characteristics confirm that THEMIS and ERG indeed observed the same wave activity. However, upon closer examination of the wave intensity variations, we identify two distinct categories of events: those that follow the statistically predicted variations in wave intensity along magnetic latitudes, and those that exhibit rapid wave intensity decay away from the equatorial plane. We analyze main characteristics of events from both categories and discuss possible implications of our analysis for radiation belt models. |
| title | Variation of Whistler-Mode Wave Characteristics Along Magnetic Field Lines: Comparison of Near-Equatorial THEMIS and Middle-Latitude ERG Observations |
| topic | Space Physics Plasma Physics |
| url | https://arxiv.org/abs/2409.09900 |