Transverse prominence motions from 10,000 - 250,000K
Abstract
We address the origin of prominence material by comparing high cadence (30-60 s) He I and O V EUV observations from SOHO/CDS wide slit movies, and also, for another prominence observation, observations from TRACE at 1216 Å and 1600 Å and SVST in Hα. The EUV and UV observations regularly show small scale structures with plane-of-the sky velocities of 20-80 km/s. Many, although not all, of these motions are seen in multiple wavelength bands, representing temperatures ranging from 10,000 - 100,000K or 20,000 - 250,000K, depending on the data set. The Hα observations contain line shift information showing clearly that the associated UV prominence intensity motions do actually represnt real mass motions, as opposed to temperature or density waves. The results also indicate that the "prominence-corona transition region" is not an outside layer to the prominence as a whole, but is rather associated with smaller scale structures all through the prominence. More work is needed to determine what mechanism can explain these fast, multi-temperature prominence motions.
- Publication:
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From Solar Min to Max: Half a Solar Cycle with SOHO
- Pub Date:
- June 2002
- Bibcode:
- 2002ESASP.508..307K
- Keywords:
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- Sun;
- Prominences