SOHO/SUMER: Almost "last light"

"Ionization degree in filaments" was the last study run on SUMER before SOHO was lost and recovered. After this study ended on 22.Jun.98, the history memory was read out, the door was closed, and SUMER was switched off until the next campaign.

But on 24.Jun.98, ground control lost contact with SOHO for about six weeks. For a while, it was not clear if the instruments could be put to work again after this unvoluntary hibernation (see SOHO: What's New). In Nov.98 we learnt that SUMER is studying the Sun again, working as before.

This image could have been the sunset for SUMER on SOHO. It was taken on 22.Jun.98, 11:29 UT, at the north-west Solar limb: a six-second-exposure of a spectral window around Helium I 584, the last image taken by the study described below.


SUMER study #1787: Ionization degree in filaments

Remarks: The study was initiated by K. Bocchialini (IAS).

Spectral windows





IED, 25.Aug.98