The Mg/Ne abundance ratio in a recently emerged flux region observed by CDS

Details The Mg/Ne abundance ratio in a recently emerged flux region observed by CDS The Mg/Ne abundance ratio in a recently emerged flux region observed by CDS

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997soph..175..523y&link_type=abstract

Solar Physics, Volume 175, Issue 2, pp.523-539

Physics

41

Scientific paper

Evidence for the existence of the FIP-effect in the transition region is presented here based on recent observations from the Coronal Diagnostic Spectrometer (CDS) on-board the Solar and Heliospheric Observatory (SOHO). Observations of an emerging flux region in lines of Mgv vii and Nevi vii reveal differences in the relative Mg/Ne abundance of a factor of 9.2 between two transition region brightenings separated by less than 1 arc min on the Sun. The lower abundance ratio is approximately equal to the photospheric Mg/Ne value and is associated with a small loop-like feature in the central, hottest part of the active region. The higher abundance ratio is found in spike-like structures at the edge of the active region. A density diagnostic of Oiv is used to derive an electron number density of 1011.3 cm-3 for the low Mg/Ne brightening, while a Mgvii diagnostic gives a density of 109.2 cm for the high Mg/Ne brightening.

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