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Conference Paper

Mirror mode storms observed by Solar Orbiter

Authors

Dimmock,  Andrew
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yordanova,  Emiliya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Graham,  Daniel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Khotyaintsev,  Yuri
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Blanco-Cano,  Xochitl
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kajdič,  Primoz
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Karlsson,  Tomas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fedorov,  Andrei
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Owen,  Chris
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Werner,  Elizabeth
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Johlander,  Andreas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Dimmock, A., Yordanova, E., Graham, D., Khotyaintsev, Y., Blanco-Cano, X., Kajdič, P., Karlsson, T., Fedorov, A., Owen, C., Werner, E., Johlander, A. (2023): Mirror mode storms observed by Solar Orbiter, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0759


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016709
Abstract
Mirror modes are a universal plasma process, which has been observed across diverse plasma environments such as planetary magnetospheres, comets, and the solar wind. Their growth is due to free energy from anisotropies in the pressure and they play a pivotal role in constraining the plasma to marginal stability. In this study, Solar Orbiter was used to analyze trains of mirror mode structures in the solar wind and inside solar wind structures across heliocentric distances between 0.5-1 AU. These types of mirror modes are called mirror mode storms and differ from the more isolated, higher amplitude, and larger-scale structures that are more typically observed in these regions. We have investigated several fundamental properties of mirror mode storms: their dependence on heliospheric distance, association with local plasma properties, temporal/spatial scale, amplitude, and connections with larger-scale solar wind transients such as CMEs and SIRs. The main findings are that mirror mode storms can approach local ion scales and deviate from the typically assumed long-wavelength limit. They are frequently observed close to current sheets and on occasion found downstream of interplanetary shocks. The relative occurrence of these events is low and appeared to be observed during moderate-slow solar wind speeds.