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Magnetosheath Jet Occurrence Rate in Relation to CMEs and SIRs
Florian Koller1, Manuela Temmer1, Luis Preisser2
1Institute of Physics University of Graz Graz Austria.
Magnetosheath jets, crucial for solar wind-magnetosphere coupling, decrease during coronal mass ejections (CMEs) but increase with high-speed streams (HSSs). This study analyzes jet production during these solar wind events.
Area of Science:
- Space Physics
- Solar-Terrestrial Physics
- Magnetospheric Physics
Background:
- Magnetosheath jets are key to solar wind-magnetosphere coupling.
- Understanding jet dynamics is vital for space weather forecasting.
- Previous studies lacked comprehensive statistical analysis of jet production during large-scale solar wind structures.
Purpose of the Study:
- To conduct the first statistical study on magnetosheath jet production during coronal mass ejections (CMEs), stream interaction regions (SIRs), and high-speed streams (HSSs).
- To investigate the influence of different solar wind structures on magnetosheath jet characteristics.
- To provide insights for improved forecasting of space weather events.
Main Methods:
- Utilized magnetosheath data from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft (2008-2020).
- Employed two distinct jet definitions to mitigate detection biases.
- Cross-referenced and expanded CME, SIR, and HSS lists using OMNI data (1996-2020).
Main Results:
- Observed a decrease in the number and duration of magnetosheath jets during CME sheaths and magnetic ejecta (MEs).
- Jet occurrence recovered rapidly after CME passage.
- Jet activity significantly increased during SIR and HSS phases.
Conclusions:
- Coronal mass ejections suppress magnetosheath jet formation, while SIRs and HSSs enhance it.
- These findings highlight the differential impact of solar wind structures on magnetospheric processes.
- The results offer a basis for refining space weather models and predictions related to magnetosheath jets.
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