The low-latitude inner corona of the sun observed by SUMER on SOHO

Details The low-latitude inner corona of the sun observed by SUMER on SOHO The low-latitude inner corona of the sun observed by SUMER on SOHO

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..269w&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 269-272 (1999).

Physics

3

Ultraviolet

Scientific paper

High-resolution spectra obtained by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrograph in both spectral and spatial regimes provided the opportunity to study streamer plasmas in detail at low and medium solar latitudes of the inner corona. An analysis of EUV and UV emission lines shows that the lines exhibit a fundamentally different behavior depending on their formation temperatures. These observations have been supported by line ratio plasma diagnostics. Electron densities have been deduced from the Si VIII line ratio L(1440 Å)/L(1445 Å). The Mg IX ratio L(706 Å)/L(750 Å) has been used to determine the corresponding electron temperatures. The neon-to-magnesium ratio is changing with latitude both in the east and the west streamer in the same manner.

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