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Tuesday 17 Nov 2020The Evolution of Interplanetary Coronal Mass Ejections: Multi-spacecraft Observations in the Inner and Outer Heliosphere

Emma Davies - Imperial College

Zoom 14:00-15:00

Interplanetary coronal mass ejections, ICMEs, are the main drivers of severe space weather at Earth which can affect systems both in space and on the ground. Understanding ICME evolution is of great interest in space weather modelling. To better understand ICME evolution in-situ, it is useful to track signatures of specific ICMEs over large heliocentric distances whilst spacecraft are close to radial alignment. Such studies of ICMEs are relatively rare but provide valuable insight into their properties, rotation, and expansion as they propagate through the heliosphere.

Most ICME studies focus on the inner heliosphere, utilising planetary mission spacecraft as well as dedicated spacecraft in the solar wind such as Solar Orbiter. Planetary missions in their cruise phase can also be utilised to study ICMEs; Juno cruise phase data provides a new opportunity to study ICME evolution beyond 1 AU. We present observations of two separate events: firstly, an ICME observed by Juno on the 25th October 2011 and secondly, an ICME observed by Solar Orbiter on the 19th April 2020. Both events are isolated ICMEs that are also observed by spacecraft near the Earth. We use the multi-spacecraft observations to assess their evolution, global structure, and interactions with other solar wind features as they propagate.

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Meeting ID: 929 3253 9912

Password: 220099

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