SH018-0001
Tracking a CME and SIR to Earth and Mars during the deep minimum of Solar Cycle 24

Wednesday, 9 December 2020
Poster
Erika Palmerio1, Christina O Lee1, Ian G Richardson2, Nariaki Nitta3, M. Leila Mays4, Jasper S Halekas5, Cary Zeitlin6 and Janet G Luhmann1, (1)University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, (2)NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, MD, United States, (3)Lockheed Martin Advanced Technology Center, Palo Alto, CA, United States, (4)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (5)University of Iowa, Department of Physics and Astronomy, Iowa City, IA, United States, (6)Leidos Innovations Corporation, Houston, TX, United States
Abstract:
Interplanetary coronal mass ejections (ICMEs) and stream interaction regions (SIRs) are large-scale solar wind structures that can often be tracked at widely-separated locations in the heliosphere. Their occurrence is strongly dependent on the phase of the solar cycle, with ICMEs being more frequent during solar maximum and SIRs being dominant during solar minimum. Nevertheless, a few ICMEs are present during solar minimum, and coordinated studies of these ICMEs, from their origin throughout their evolution in the heliosphere, are facilitated by the simpler solar wind structure, a near absence of other transients, and low levels of solar activity.

We present a detailed analysis of an ICME and SIR that were observed during the solar minimum between Solar Cycles 24 and 25. To achieve this, we combine remote-sensing solar data with in-situ measurements at Earth and Mars, which were separated by ~10° in longitude at the time of the events under analysis. The aim of this study is to determine how the two structures evolve and interact as they travel away from the Sun, as well as to evaluate and compare the space weather response from the same chain of events on two different planets.

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