SUMER, CDS and UVCS provide unique spectroscopic diagnostics of CME material through both Doppler shifts and line intensities. The Doppler shift information complements imaging data from LASCO and EIT, providing a probe of the structure of the expanding plasma along the line-of-sight. The line intensities provide unique information about the density, temperature and ionization state of the expanding plasma. Both very high and very low ions have been detected, H I to [Fe XIX]. The combiantion of temperatue, density and ionization state constrains the thermal history of the CME plasma.
From Solar Min to Max: Half a Solar Cycle with SOHO
- Pub Date:
- June 2002
- Solar Corona;
- Coronal Mass Ejections;