Multi-Instrument Campaigns to Observe the Off-Limb Corona

Astronomy and Astrophysics – Astronomy

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Scientific paper

We briefly describe two multi-instrument campaigns we coordinated to observe the off-limb corona in 2007, with some preliminary results. The first one (Hinode HOP 7) was a SOHO/Hinode/TRACE/STEREO/Ulysses week-long campaign during the SOHO-Ulysses quadrature in 2007 May. We could not achieve all of our goals, however we were very fortunate in that the ``Del Zanna'' active region appeared on the Sun at the right longitude, and that a filament eruption and a CME were observed. Of particular significance is the finding of large (100 km s-1) non-thermal broadenings in all coronal lines observed by Hinode/EIS in the region where the filament was erupting. The second campaign (Hinode HOP 44) involved SOHO (CDS, SUMER, UVCS), Hinode, and TRACE to measure the physical parameters of plume/interplume regions in the polar coronal holes from the low corona to 1.7 solar radii, on 30/10-4/11. We obtained a good set of observations, however various instrumental constraints and the lack of fully developed plumes limited our goals.

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