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Statistical Properties of Small-scale Linear Magnetic Holes in the Martian Magnetosheath.
- Source :
-
Astrophysical Journal . 8/1/2021, Vol. 916 Issue 2, p1-7. 7p. - Publication Year :
- 2021
-
Abstract
- The small-scale linear magnetic hole (LMH) is a magnetic dip with a size less than or on the order of ρi (proton gyroradius), which may contribute to turbulence properties in the solar wind and other astrophysical plasmas. Based on one-month measurements of the Mars Atmosphere and Volatile EvolutioN mission, 174 small-scale LMH events in the Martian magnetosheath are used to investigate their statistical properties in this study. Our results show that small-scale linear LMHs are ubiquitous in the Martian magnetosheath, and their occurrence rate is estimated to be approximately 1.5 events per hour based on one-month observations. Compared with the ambient plasma, the averaged magnitude of the magnetic field in these holes can decrease from 6.8–3.5 nT. Nearly 66% of events have a Bmin/B value in the range of (0.45, 0.75). The duration of small-scale MHs is mainly less than 0.4 s. For 90% of the events, the size along the solar wind flow is less than ρi. As the rotation angle increases, the occurrence rate of small-scale LMHs decrease. However, the Bmin/B, size, and duration of small-scale LMHs have no obvious dependence on their rotation angle. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 916
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 151834715
- Full Text :
- https://doi.org/10.3847/1538-4357/ac090b