Energetic Electron Pitch-angle Distributions in the Martian Space Environment: Pancake
We perform a statistical investigation of the occurrence rates of energetic electron (100–500 eV) pancake pitch-angle distributions (PADs) in the Martian space environment by utilizing 6 yr of MAVEN data. In the Martian ionosphere, we find the following: (1) at the same altitude in the terminator an...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/accb57 |
| _version_ | 1797698503965671424 |
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| author | Z. Z. Guo Y. Y. Liu Z. Wang Y. Xu |
| author_facet | Z. Z. Guo Y. Y. Liu Z. Wang Y. Xu |
| author_sort | Z. Z. Guo |
| collection | DOAJ |
| description | We perform a statistical investigation of the occurrence rates of energetic electron (100–500 eV) pancake pitch-angle distributions (PADs) in the Martian space environment by utilizing 6 yr of MAVEN data. In the Martian ionosphere, we find the following: (1) at the same altitude in the terminator and night regions, the occurrences rates in the center of the southern magnetic anomaly regions are very low, but at the edges of strong magnetic fields, they increase significantly; (2) the occurrence rates of energetic electron perpendicular anisotropies on the Martian dayside increase with altitude; and (3) some closed magnetic lines in the 10°S–55°S, 30°W–125°W region at 400–800 km altitude gradually become open during the rotation of Mars from duskside to dawnside, while more closed magnetic lines are produced in the 40°S–65°S, 35°E–90°E region. In the Martian induced magnetosphere, we find the following: (1) the high-energy electron perpendicular anisotropy in the magnetosheath is the most significant; (2) the occurrence rates in the southern ( Z _MSO ≤−1 R _M ) magnetosheath are higher than those in the northern ( Z _MSO ≥ 1 R _M ) magnetosheath; (3) in the region of ∣ Z _MSO ∣ < 0.5 R _M , these high-energy electron pancake PADs are mainly concentrated in the magnetosheath region with Y _MSO ∈ [−1.4R _M , 2 R _M ]; (4) the occurrence rates in the dawnside ( Y _MSO ≤−1 R _M ) magnetosheath are higher than those in the duskside ( Y _MSO ≥ 1 R _M ) magnetosheath; and (5) in the region of ∣ Y _MSO ∣ < 0.5 R _M , the occurrence rates throughout the magnetosheath are very high. |
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| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:55:04Z |
| publishDate | 2023-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj.art-c550c94c1fc647c48836cca265870f4d2023-09-03T12:05:24ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195015410.3847/1538-4357/accb57Energetic Electron Pitch-angle Distributions in the Martian Space Environment: PancakeZ. Z. Guo0https://orcid.org/0000-0002-4479-7045Y. Y. Liu1https://orcid.org/0000-0002-0765-1709Z. Wang2https://orcid.org/0000-0002-1720-964XY. Xu3https://orcid.org/0000-0003-1863-7280School of Space and Environment, Beihang University , Beijing, People’s Republic of China ; zhizhongguo8@gmail.com; Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology , Beijing, People’s Republic of ChinaSchool of Space and Environment, Beihang University , Beijing, People’s Republic of China ; zhizhongguo8@gmail.com; Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology , Beijing, People’s Republic of ChinaSchool of Space and Environment, Beihang University , Beijing, People’s Republic of China ; zhizhongguo8@gmail.com; Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology , Beijing, People’s Republic of ChinaSchool of Space and Environment, Beihang University , Beijing, People’s Republic of China ; zhizhongguo8@gmail.com; Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology , Beijing, People’s Republic of ChinaWe perform a statistical investigation of the occurrence rates of energetic electron (100–500 eV) pancake pitch-angle distributions (PADs) in the Martian space environment by utilizing 6 yr of MAVEN data. In the Martian ionosphere, we find the following: (1) at the same altitude in the terminator and night regions, the occurrences rates in the center of the southern magnetic anomaly regions are very low, but at the edges of strong magnetic fields, they increase significantly; (2) the occurrence rates of energetic electron perpendicular anisotropies on the Martian dayside increase with altitude; and (3) some closed magnetic lines in the 10°S–55°S, 30°W–125°W region at 400–800 km altitude gradually become open during the rotation of Mars from duskside to dawnside, while more closed magnetic lines are produced in the 40°S–65°S, 35°E–90°E region. In the Martian induced magnetosphere, we find the following: (1) the high-energy electron perpendicular anisotropy in the magnetosheath is the most significant; (2) the occurrence rates in the southern ( Z _MSO ≤−1 R _M ) magnetosheath are higher than those in the northern ( Z _MSO ≥ 1 R _M ) magnetosheath; (3) in the region of ∣ Z _MSO ∣ < 0.5 R _M , these high-energy electron pancake PADs are mainly concentrated in the magnetosheath region with Y _MSO ∈ [−1.4R _M , 2 R _M ]; (4) the occurrence rates in the dawnside ( Y _MSO ≤−1 R _M ) magnetosheath are higher than those in the duskside ( Y _MSO ≥ 1 R _M ) magnetosheath; and (5) in the region of ∣ Y _MSO ∣ < 0.5 R _M , the occurrence rates throughout the magnetosheath are very high.https://doi.org/10.3847/1538-4357/accb57MarsPlanetary magnetospheresPlanetary dynamicsMagnetic fieldsSpace plasmas |
| spellingShingle | Z. Z. Guo Y. Y. Liu Z. Wang Y. Xu Energetic Electron Pitch-angle Distributions in the Martian Space Environment: Pancake The Astrophysical Journal Mars Planetary magnetospheres Planetary dynamics Magnetic fields Space plasmas |
| title | Energetic Electron Pitch-angle Distributions in the Martian Space Environment: Pancake |
| title_full | Energetic Electron Pitch-angle Distributions in the Martian Space Environment: Pancake |
| title_fullStr | Energetic Electron Pitch-angle Distributions in the Martian Space Environment: Pancake |
| title_full_unstemmed | Energetic Electron Pitch-angle Distributions in the Martian Space Environment: Pancake |
| title_short | Energetic Electron Pitch-angle Distributions in the Martian Space Environment: Pancake |
| title_sort | energetic electron pitch angle distributions in the martian space environment pancake |
| topic | Mars Planetary magnetospheres Planetary dynamics Magnetic fields Space plasmas |
| url | https://doi.org/10.3847/1538-4357/accb57 |
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