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Statistical analysis of mirror mode waves in sheath regions driven by interplanetary coronal mass ejection
Univ Helsinki, Dept Phys, POB 64, Helsinki, Finland.
Univ Helsinki, Dept Phys, POB 64, Helsinki, Finland.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Aalto Univ, Sch Elect Engn, Espoo, Finland.ORCID iD: 0000-0003-1589-6711
Aalto Univ, Sch Elect Engn, Espoo, Finland.
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2018 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 36, no 3, p. 793-808Article in journal (Refereed) Published
Abstract [en]

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 Alfven 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.

Place, publisher, year, edition, pages
2018. Vol. 36, no 3, p. 793-808
Keywords [en]
Interplanetary physics, plasma waves and turbulence, solar wind plasma, space plasma physics, waves and instabilities
National Category
Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-357564DOI: 10.5194/angeo-36-793-2018ISI: 000433126600001OAI: oai:DiVA.org:uu-357564DiVA, id: diva2:1239680
Funder
EU, Horizon 2020, 4100103Available from: 2018-08-17 Created: 2018-08-17 Last updated: 2018-08-31Bibliographically approved

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Dimmock, Andrew P.
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