SUMER observations of hydrogen Lyman series and continuum in a prominence

Details SUMER observations of hydrogen Lyman series and continuum in a prominence SUMER observations of hydrogen Lyman series and continuum in a prominence

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..419a&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

1

Prominences, Spectroscopy, Uv, Hydrogen

Scientific paper

We present observations of a prominence, taken on February 20, 1998 in the framework of SOHO Joint Observing Program no. 63. The instruments involved were SUMER and the Normal Incidence Spectrograph (NIS) of CDS. The SUMER spectral range includes the hydrogen Lyman series - starting from Ly-ɛ - down to the head of the Lyman continuum, while CDS observed a number of lines from T ~ 104K to T ~ 2×106K. For these observations, we were able to obtain a satisfactory determination of the pointing of the SUMER slit relative to CDS. We thus examined - and compared with information from CDS spectra - the main characteristics of the hydrogen Lyman series lines and of other strong lines in the SUMER spectral interval. We also studied the properties (depth, asymmetry) of the central reversal present in several or all of the Lyman lines in some regions of the prominence.

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