Main Objective: Hinode/EIS support for Solar Orbiter/METIS Observation taken during CH-Boundary-Expansion SOOP campaign on 9 April 2023
Scientific Justification: We request support from Hinode/EIS for Solar Orbiter observing campaign focusing on the dynamic of coronal hole boundaries (CH Boundary Expansion SOOP), which will take place on 9th April 2023. Coronal hole boundaries are regarded as one of the sources of the slow solar wind, which is one of the open questions in heliophysics. The main aim of this observation is to investigate overexpanded coronal hole boundaries as slow solar wind sources, focusing on three particular questions.
1. Does slow wind originate from the over-expanded edges of coronal holes? 2. Does slow and intermediate solar wind originate from coronal loops outside of coronal holes? 3. Abundance of minor ions as a function of height in the corona as indicators of slow or fast wind
Solar Orbiter will be at 0.3 AU from the Sun and at the angle of 60 degree west from the Sun-Earth line. The observation is led by METIS, a coronagraph covering the distance between 1.75 to 4 solar radii, complemented by EUI, PHI and SPICE instruments. Hinode/EIS can contribute by studying the plasma properties, such as plasma composition and velocity, at the inner solar corona at the base of the region observed by METIS. In particular, we will have a chance to observe plasma in the inner and outer corona by using the combination of EIS with METIS and SPICE with LASCO C2 in this campaign. |
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