statistical analysis of mirror mode waves in sheath regions driven by interplanetary coronal mass ejection
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2018
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Abstract
We present a comprehensive statistical analysis of mirror mode waves and the
properties of their plasma surroundings in sheath regions driven by interplanetary coronal mass
ejection (ICME). We have constructed a semi-automated
method to identify mirror modes from the magnetic field data. We analyze 91
ICME sheath regions from January 1997 to April 2015 using data from the
Wind spacecraft. The results imply that similarly to planetary magnetosheaths,
mirror modes are also common structures in ICME sheaths. However, they occur
almost exclusively as dip-like structures and in mirror stable plasma. We
observe mirror modes throughout the sheath, from the bow shock to the ICME
leading edge, but their amplitudes are largest closest to the shock. We also
find that the shock strength (measured by Alfvén Mach number) is the most
important parameter in controlling the occurrence of mirror modes. Our
findings suggest that in ICME sheaths the dominant source of free energy for
mirror mode generation is the shock compression. We also suggest that mirror
modes that are found deeper in the sheath are remnants from earlier times of
the sheath evolution, generated also in the vicinity of the shock.
| Reference Key |
ala-lahti2018annalesstatistical
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|---|---|
| Authors | ;M. M. Ala-Lahti;E. K. J. Kilpua;A. P. Dimmock;A. P. Dimmock;A. Osmane;T. Pulkkinen;J. Souček |
| Journal | journal of food measurement and characterization |
| Year | 2018 |
| DOI |
10.5194/angeo-36-793-2018
|
| URL | |
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