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Is Solar Minimum 24/25 Another Unusual One?
- Source :
- 2021 ApJL 917 L26
- Publication Year :
- 2021
-
Abstract
- The solar minimum 23/24 is considered to be unusual because it exhibits features that differ notably from those commonly seen in pervious minima. In this letter, we analyze the solar polar magnetic field, the potential-field solution of the solar corona, and the in-situ solar wind measurements to see whether the recent solar minimum 24/25 is another unusual one. While the dipolar configuration that are commonly seen during minimum 22/23 and earlier minima persist for about half a year after the absolute minimum of solar cycle 24, the corona has a morphology more complex than a simple dipole before the absolute minimum. The fast solar wind streams are less dominant than minimum 23/24. The IMF strength, density and mass flux that are historically low in the minimum 23/24 are regained during minimum 24/25, but still do not reach the minimum 22/23 level. From the analysis of this Letter, it seems that the minimum 24/25 is only partially unusual, and the recovery of the commonly minimum features may result from the enhancement of the polar field.<br />Comment: Accepted by APJL
- Subjects :
- Astrophysics - Solar and Stellar Astrophysics
Subjects
Details
- Database :
- arXiv
- Journal :
- 2021 ApJL 917 L26
- Publication Type :
- Report
- Accession number :
- edsarx.2107.04944
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/2041-8213/ac13a6