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Geospace Plume and Its Impact on Dayside Magnetopause Reconnection Rate
Ying Zou1, Brian M Walsh2, Xueling Shi3,4
1Department of Space Science University of Alabama in Huntsville Huntsville AL USA.
Journal of Geophysical Research. Space Physics
|August 26, 2021
Summary
Geospace plumes entering the magnetopause decrease local reconnection efficiency, but do not significantly alter global rates. This suggests cold dense plasma redistributes, rather than reduces, solar wind-magnetosphere coupling effects.
Area of Science:
- Space Physics
- Plasma Physics
- Geophysics
Background:
- Magnetopause reconnection is crucial for solar wind-magnetosphere coupling.
- Two theories exist: local-control (plumes decrease reconnection) vs. global-control (solar wind dominates).
- Spacecraft point measurements are insufficient to test these theories.
Purpose of the Study:
- To investigate the role of geospace plumes in magnetopause reconnection.
- To differentiate between local-control and global-control theories.
- To understand the impact of cold dense plasma on solar wind-magnetosphere interactions.
Main Methods:
- Utilized THEMIS and LANL spacecraft to identify geospace plumes and magnetopause contact.
- Employed GPS measurements to track plume evolution and morphology.
- Used SuperDARN radar to monitor dayside reconnection distribution and strength.
Main Results:
- Observed decreased reconnection efficiency (81% and 68%) at plume contact longitudes during two storm events.
- Results align with mass loading effects of plumes (approx. 4 amu).
- Reconnection enhanced around the plume contact; cross-polar cap potential remained stable.
Conclusions:
- Geospace plumes locally reduce magnetopause reconnection efficiency.
- Plumes redistribute reconnection activity without substantially altering global reconnection strength.
- Findings clarify the role of cold dense plasma in solar wind-magnetosphere coupling.
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