Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observations
Abstract The magnetic reconnection environment around the dayside geomagnetopause under long-lasting southward interplanetary magnetic field (IMF) conditions is investigated using the in-situ observation by GEOTAIL satellite from 1994 to 2019. We focus on the degrees of asymmetry in the plasma densi...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2024-02-01
|
| Series: | Earth, Planets and Space |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40623-024-01971-3 |
| _version_ | 1797275561558540288 |
|---|---|
| author | Koji Kondoh Shin-ya Nitta |
| author_facet | Koji Kondoh Shin-ya Nitta |
| author_sort | Koji Kondoh |
| collection | DOAJ |
| description | Abstract The magnetic reconnection environment around the dayside geomagnetopause under long-lasting southward interplanetary magnetic field (IMF) conditions is investigated using the in-situ observation by GEOTAIL satellite from 1994 to 2019. We focus on the degrees of asymmetry in the plasma density, ion temperature and the magnetic field strength between both sides of the magnetopause, that is, the ratio of the value in the magnetosphere to that in the magnetosheath in order to compute the much more realistic current sheet systems in numerical simulations. To exclude all of the interplanetary disturbance events such as Corotating Interaction Regions (CIRs) and Coronal Mass Ejections (CMEs), we investigate magnetopause crossings under long-lasting southward IMF conditions. GEOTAIL satellite sometimes repeatedly across the magnetopause during each pass due to the oscillating of the magnetopause. The degrees of asymmetry vary even during a single pass. This variation depends on the locus of the observation point, particularly the GSM Y-position, not on the time. The degrees of asymmetry in the plasma density, ion temperature and the magnetic field strength have significant variation in the data. The data points of the degree of asymmetry in the plasma density significantly spread in the duskside, while that in the magnetic field strength further widely spread in the dawnside. The degree of asymmetry in the plasma density and that in the magnetic field strength have fixed negative correlation on a log–log scale. Graphical Abstract |
| first_indexed | 2024-03-07T15:15:16Z |
| format | Article |
| id | doaj.art-97a65c6de54e43c4a47b394cf4d18cf5 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-03-07T15:15:16Z |
| publishDate | 2024-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-97a65c6de54e43c4a47b394cf4d18cf52024-03-05T17:56:46ZengSpringerOpenEarth, Planets and Space1880-59812024-02-017611910.1186/s40623-024-01971-3Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observationsKoji Kondoh0Shin-ya Nitta1Research Center for Space and Cosmic Evolution, Ehime UniversityTsukuba University of TechnologyAbstract The magnetic reconnection environment around the dayside geomagnetopause under long-lasting southward interplanetary magnetic field (IMF) conditions is investigated using the in-situ observation by GEOTAIL satellite from 1994 to 2019. We focus on the degrees of asymmetry in the plasma density, ion temperature and the magnetic field strength between both sides of the magnetopause, that is, the ratio of the value in the magnetosphere to that in the magnetosheath in order to compute the much more realistic current sheet systems in numerical simulations. To exclude all of the interplanetary disturbance events such as Corotating Interaction Regions (CIRs) and Coronal Mass Ejections (CMEs), we investigate magnetopause crossings under long-lasting southward IMF conditions. GEOTAIL satellite sometimes repeatedly across the magnetopause during each pass due to the oscillating of the magnetopause. The degrees of asymmetry vary even during a single pass. This variation depends on the locus of the observation point, particularly the GSM Y-position, not on the time. The degrees of asymmetry in the plasma density, ion temperature and the magnetic field strength have significant variation in the data. The data points of the degree of asymmetry in the plasma density significantly spread in the duskside, while that in the magnetic field strength further widely spread in the dawnside. The degree of asymmetry in the plasma density and that in the magnetic field strength have fixed negative correlation on a log–log scale. Graphical Abstracthttps://doi.org/10.1186/s40623-024-01971-3GEOTAIL satelliteAsymmetric magnetic reconnectionMagnetohydrodynamics (MHD) simulationMagnetopauseIn-situ observation |
| spellingShingle | Koji Kondoh Shin-ya Nitta Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observations Earth, Planets and Space GEOTAIL satellite Asymmetric magnetic reconnection Magnetohydrodynamics (MHD) simulation Magnetopause In-situ observation |
| title | Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observations |
| title_full | Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observations |
| title_fullStr | Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observations |
| title_full_unstemmed | Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observations |
| title_short | Investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using GEOTAIL observations |
| title_sort | investigations of the degree of asymmetry across the dayside magnetopause under southward interplanetary magnetic field using geotail observations |
| topic | GEOTAIL satellite Asymmetric magnetic reconnection Magnetohydrodynamics (MHD) simulation Magnetopause In-situ observation |
| url | https://doi.org/10.1186/s40623-024-01971-3 |
| work_keys_str_mv | AT kojikondoh investigationsofthedegreeofasymmetryacrossthedaysidemagnetopauseundersouthwardinterplanetarymagneticfieldusinggeotailobservations AT shinyanitta investigationsofthedegreeofasymmetryacrossthedaysidemagnetopauseundersouthwardinterplanetarymagneticfieldusinggeotailobservations |