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Magnetosheath Jet Formation Influenced by Parameters in Solar Wind Structures
Florian Koller1, Ferdinand Plaschke2, Manuela Temmer1
1Institute of Physics University of Graz Graz Austria.
Journal of Geophysical Research. Space Physics
|March 5, 2024
Summary
Magnetosheath jets are linked to solar wind structures. Coronal mass ejections (CMEs) and stream interaction regions (SIRs) influence jet production, with high-speed streams (HSSs) being most favorable for jet generation.
Area of Science:
- Space Physics
- Plasma Physics
- Solar Wind-Magnetosphere Interactions
Background:
- Magnetosheath jets are dynamic pressure enhancements originating from foreshock processes.
- Previous studies indicate fewer jets during coronal mass ejections (CMEs) and more during stream interaction regions (SIRs).
- The influence of substructures within CMEs and SIRs on jet production remains unclear.
Purpose of the Study:
- To investigate the relationship between CME and SIR substructures and magnetosheath jet production.
- To identify specific solar wind parameters that govern jet occurrence within different solar wind structures.
- To compare jet production probabilities across various solar wind conditions.
Main Methods:
- Analysis of THEMIS and OMNI satellite data from 2008-2021.
- Distinguishing between compression and magnetic ejecta (ME) regions for CMEs.
- Identifying compression regions, stream interfaces, and high-speed streams (HSSs) for SIRs.
- Calculating 2D probability distributions of jet occurrence based on cone angle and Alfvén Mach number.
- Utilizing 1D histograms to analyze parameter dependencies.
Main Results:
- High cone angles and low Alfvén Mach numbers within CME-MEs are unfavorable for jet production.
- These conditions within CME-MEs may hinder the formation of a well-defined foreshock region.
- High-speed streams (HSSs) exhibit the most favorable conditions for jet generation.
- Favorable HSS conditions include low cone angles, low densities, and low magnetic field strengths.
Conclusions:
- The substructure of solar wind disturbances significantly impacts magnetosheath jet generation.
- CME magnetic ejecta regions are less conducive to jet formation compared to other structures.
- High-speed streams offer the optimal solar wind conditions for producing magnetosheath jets due to their specific plasma and field properties.
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