EUVS-C: the measurement of the magnesium II index for GOES-R EXIS

Details EUVS-C: the measurement of the magnesium II index for GOES-R EXIS EUVS-C: the measurement of the magnesium II index for GOES-R EXIS

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7438e...2s&link_type=abstract

Solar Physics and Space Weather Instrumentation III. Edited by Fineschi, Silvano; Fennelly, Judy A. Proceedings of the SPIE, Vol

Physics

Scientific paper

The EUV and X-ray Irradiance Sensors (EXIS) on the upcoming GOES-R mission will include a spectrograph to measure the Magnesium II doublet at 280 nm (channel C). The ratio of the core of this spectral feature to the line wings is the well-known Mg II index. This ratio is often used as a proxy for chromospheric activity, since changes in the index are highly correlated with changes in other chromospheric emission lines. As a ratio measurement, the Mg II index is relatively insensitive to instrumental effects. The A and B channels of the Extreme UltraViolet Sensor (EUVS) will make use of this fact and use the Mg II index measured by channel C in their degradation correction. EUVS C channel has sufficient spectral resolution and sampling to measure the Mg II index with high precision and will make this measurement at better than 30 s time cadence. This paper describes the design and measurement requirements of the C channel.

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