SWRI/LASP Sounding Rocket Inter-Calibration With The Eit Instrument On Board SOHO

Details SWRI/LASP Sounding Rocket Inter-Calibration With The Eit Instrument On Board SOHO SWRI/LASP Sounding Rocket Inter-Calibration With The Eit Instrument On Board SOHO

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001soph..202..269a&link_type=abstract

Solar Physics, v. 202, Issue 2, p. 269-280 (2001).

Physics

3

Scientific paper

Two successful sounding rocket flights were launched on 15 May 1997 and 2 November 1998 with an objective of providing inter-calibration with several of the instruments on board SOHO and TRACE. We will discuss here the results of the inter-calibration between the SwRI/LASP rocket imaging instruments and the Extreme-ultraviolet Imaging Telescope (EIT) on SOHO. The Multiple XUV Imager (MXUVI) sounding rocket instrument is a multi-layer mirror telescope equipped with an internal occulter and light trap to provide full-disk images of Feix/x 17.1 nm and off-limb observations of Heii 30.4 nm. The SOHO/EIT instrument is also a full-disk multi-layer imager with four channels, Fe ix/x 17.1 nm, Fexii 19.5 nm, Fexv 28.4 nm and Heii 30.4 nm. By comparison with the EIT observations taken at the same time, we provide new flat-field determinations for EIT which help quantify the sensitivity degradation of the EIT detector, as well as provide a measure of the off-limb stray-light characteristics of the two instruments. We find that the EIT stray-light function is strongly asymmetric, with greater stray light in the 17.1 and 19.5 nm quadrants than the 30.4 and 28.4 nm quadrants. Two possible causes of this asymmetry are the polishing processes of the EIT mirrors and the asymmetric support grid pattern in the foil mesh at the EIT pupil.

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