Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulation
Ultra-low frequency (ULF) waves are routinely observed in Earth’s dayside magnetosphere. Here we investigate the influence of externally-driven density variations in the near-Earth space in the ULF regime using global 2D simulations performed with the hybrid-Vlasov model Vlasiator. With the new time...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-09-01
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| Series: | Frontiers in Astronomy and Space Sciences |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fspas.2022.984918/full |
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| author | Hongyang Zhou Lucile Turc Yann Pfau-Kempf Markus Battarbee Vertti Tarvus Maxime Dubart Harriet George Giulia Cozzani Maxime Grandin Urs Ganse Markku Alho Andreas Johlander Jonas Suni Maarja Bussov Konstantinos Papadakis Konstantinos Horaites Ivan Zaitsev Fasil Tesema Evgeny Gordeev Minna Palmroth Minna Palmroth |
| author_facet | Hongyang Zhou Lucile Turc Yann Pfau-Kempf Markus Battarbee Vertti Tarvus Maxime Dubart Harriet George Giulia Cozzani Maxime Grandin Urs Ganse Markku Alho Andreas Johlander Jonas Suni Maarja Bussov Konstantinos Papadakis Konstantinos Horaites Ivan Zaitsev Fasil Tesema Evgeny Gordeev Minna Palmroth Minna Palmroth |
| author_sort | Hongyang Zhou |
| collection | DOAJ |
| description | Ultra-low frequency (ULF) waves are routinely observed in Earth’s dayside magnetosphere. Here we investigate the influence of externally-driven density variations in the near-Earth space in the ULF regime using global 2D simulations performed with the hybrid-Vlasov model Vlasiator. With the new time-varying boundary setup, we introduce a monochromatic Pc5 range periodic density variation in the solar wind. A breathing motion of the magnetopause and changes in the bow shock standoff position are caused by the density variation, the time lag between which is found to be consistent with propagation at fast magnetohydrodynamic speed. The oscillations also create large-scale stripes of variations in the magnetosheath and modulate the mirror and electromagnetic ion cyclotron modes. We characterize the spatial-temporal properties of ULF waves at different phases of the variation. Less prominent EMIC and mirror mode wave activities near the center of magnetosheath are observed with decreasing upstream Mach number. The EMIC wave occurrence is strongly related to pressure anisotropy and β‖, both vary as a function of the upstream conditions, whereas the mirror mode occurrence is highly influenced by fast waves generated from upstream density variations. |
| first_indexed | 2024-04-13T00:36:06Z |
| format | Article |
| id | doaj.art-cfc565e899954af6a9d1ed6435e8bae8 |
| institution | Directory Open Access Journal |
| issn | 2296-987X |
| language | English |
| last_indexed | 2024-04-13T00:36:06Z |
| publishDate | 2022-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj.art-cfc565e899954af6a9d1ed6435e8bae82022-12-22T03:10:20ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2022-09-01910.3389/fspas.2022.984918984918Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulationHongyang Zhou0Lucile Turc1Yann Pfau-Kempf2Markus Battarbee3Vertti Tarvus4Maxime Dubart5Harriet George6Giulia Cozzani7Maxime Grandin8Urs Ganse9Markku Alho10Andreas Johlander11Jonas Suni12Maarja Bussov13Konstantinos Papadakis14Konstantinos Horaites15Ivan Zaitsev16Fasil Tesema17Evgeny Gordeev18Minna Palmroth 19Minna Palmroth 20University of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandSwedish Institute of Space Physics, Uppsala, SwedenUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandUniversity of Helsinki, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandUltra-low frequency (ULF) waves are routinely observed in Earth’s dayside magnetosphere. Here we investigate the influence of externally-driven density variations in the near-Earth space in the ULF regime using global 2D simulations performed with the hybrid-Vlasov model Vlasiator. With the new time-varying boundary setup, we introduce a monochromatic Pc5 range periodic density variation in the solar wind. A breathing motion of the magnetopause and changes in the bow shock standoff position are caused by the density variation, the time lag between which is found to be consistent with propagation at fast magnetohydrodynamic speed. The oscillations also create large-scale stripes of variations in the magnetosheath and modulate the mirror and electromagnetic ion cyclotron modes. We characterize the spatial-temporal properties of ULF waves at different phases of the variation. Less prominent EMIC and mirror mode wave activities near the center of magnetosheath are observed with decreasing upstream Mach number. The EMIC wave occurrence is strongly related to pressure anisotropy and β‖, both vary as a function of the upstream conditions, whereas the mirror mode occurrence is highly influenced by fast waves generated from upstream density variations.https://www.frontiersin.org/articles/10.3389/fspas.2022.984918/fullspace physicsplasmamagnetosheathsolar windsimulationkinetic |
| spellingShingle | Hongyang Zhou Lucile Turc Yann Pfau-Kempf Markus Battarbee Vertti Tarvus Maxime Dubart Harriet George Giulia Cozzani Maxime Grandin Urs Ganse Markku Alho Andreas Johlander Jonas Suni Maarja Bussov Konstantinos Papadakis Konstantinos Horaites Ivan Zaitsev Fasil Tesema Evgeny Gordeev Minna Palmroth Minna Palmroth Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulation Frontiers in Astronomy and Space Sciences space physics plasma magnetosheath solar wind simulation kinetic |
| title | Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulation |
| title_full | Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulation |
| title_fullStr | Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulation |
| title_full_unstemmed | Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulation |
| title_short | Magnetospheric responses to solar wind Pc5 density fluctuations: Results from 2D hybrid Vlasov simulation |
| title_sort | magnetospheric responses to solar wind pc5 density fluctuations results from 2d hybrid vlasov simulation |
| topic | space physics plasma magnetosheath solar wind simulation kinetic |
| url | https://www.frontiersin.org/articles/10.3389/fspas.2022.984918/full |
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