The EUV spectrum of the Sun: long-term variations in the SOHO CDS NIS spectral responsivities

Details The EUV spectrum of the Sun: long-term variations in the SOHO CDS NIS spectral responsivities The EUV spectrum of the Sun: long-term variations in the SOHO CDS NIS spectral responsivities

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...518a..49d&link_type=abstract

Astronomy and Astrophysics, Volume 518, id.A49

Astronomy and Astrophysics

Astrophysics

5

Sun: Corona, Techniques: Spectroscopic

Scientific paper

We present SOHO Coronal Diagnostic Spectrometer (CDS) normal incidence, extreme-ultraviolet spectra of the Sun taken from the beginning of the mission in 1996 until now. We use various methods to study the performance of the instrument during such a long time span. Assuming that the basal chromospheric-transition region emission in the quiet parts of the Sun does not vary over the cycle, we find a slow decrease in the instrument sensitivity over time. We applied a correction to the NIS (Normal Incidence Spectrograph) data, using as a starting reference the NIS absolute calibration obtained from a comparison with a rocket flight in May 1997. We then obtained NIS full-Sun spectral irradiances from observations in 2008 and compared them with the EUV irradiances obtained from the rocket that flew on April 14, 2008 a prototype of the Solar Dynamics Observatory EVE instrument. Excellent agreement is found between the EUV irradiances from NIS and from the EVE-prototype, confirming the NIS radiometric calibration. The NIS instrument over 13 years has performed exceptionally well, with only a factor of about 2 decrease in responsivity for most wavelengths.

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