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Proceedings Paper

Advanced Solar Coronal Explorer mission (ASCE)
Author(s): Larry D. Gardner; John L. Kohl; S. Cranmer; Silvano Fineschi; Leon Golub; John C. Raymond; Peter L. Smith; Leonard Strachan; Russell A. Howard; J. Daniel Moses; Dennis George Socker; Dennis Wang; Richard R. Fisher; Joseph M. Davila; C. St. Cyr; Giancarlo C. Noci; Marco Romoli; Giuseppe Tondello; Giampiero Naletto; Piergiorgio Nicolosi; Luca Poletto
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Paper Abstract

The Advanced Solar Coronal Explorer (ASCE) is one of five missions selected for a Phase A Concept Study in the current round of proposed MIDEX missions. ASCE's instrument complement is supported by a SPARTAN 400 reusable carrier. The spacecraft is carried into orbit and deployed by the Space Shuttle; at mission's end, nominally 2 years later, it is retrieved and returned to earth for post-flight calibration. ASCE comprises two instrument modules, the Spectroscopic and Polarimetric Coronagraph (SPC) and the Extreme Ultraviolet Imager (EUVI). The external occulter for the coronagraph is supported on a boom, which is extended 10 meters beyond the instrument apertures once the spacecraft is on station. Large aperture optics can therefore be used, and this, in combination with improvements in optical and photon detection efficiencies, will provide spectroscopy of the extended solar corona with unprecedented sensitivity and spatial resolution, routine measurements of the electron temperature, and polarimetry of the H I Lyman lines. SPC also extends the short wavelength limit to 28 nm. As a consequence, SPC will be able to perform the first He II 30.4 nm and He I 58.4 nm spectroscopy of the extended corona. In the visible part of the spectrum (450 - 600 nm), SPC's Large Aperture Spectroscopic Coronagraph (LASCO) channel will provide polarimetric images with 1.8 arc second resolution elements, which will allow the determination of polarized brightness of the coronal plasma. In a separate parallel channel LASCO will also provide images at single minor ion line wavelengths from which can be determined the shapes and Doppler shifts of those lines. The distant external occulter provides for major improvement in stray light suppression. The EUVI instrument will take high cadence images of the full disk and low corona at four selectable wavelengths with 0.9 arc second resolution elements. A description of the instrument design and performance capabilities is presented.

Paper Details

Date Published: 25 November 1999
PDF: 13 pages
Proc. SPIE 3764, Ultraviolet and X-Ray Detection, Spectroscopy, and Polarimetry III, (25 November 1999); doi: 10.1117/12.371095
Show Author Affiliations
Larry D. Gardner, Harvard-Smithsonian Ctr. for Astrophysics (United States)
John L. Kohl, Harvard-Smithsonian Ctr. for Astrophysics (United States)
S. Cranmer, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Silvano Fineschi, Harvard-Smithsonian Ctr. for Astrophysics (Italy)
Leon Golub, Harvard-Smithsonian Ctr. for Astrophysics (United States)
John C. Raymond, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Peter L. Smith, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Leonard Strachan, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Russell A. Howard, Naval Research Lab. (United States)
J. Daniel Moses, Naval Research Lab. (United States)
Dennis George Socker, Naval Research Lab. (United States)
Dennis Wang, Naval Research Lab. (United States)
Richard R. Fisher, NASA Goddard Space Flight Ctr. (United States)
Joseph M. Davila, NASA Goddard Space Flight Ctr. (United States)
C. St. Cyr, NASA Goddard Space Flight Ctr. (United States)
Giancarlo C. Noci, Univ. degli Studi di Firenze (Italy)
Marco Romoli, Univ. degli Studi di Firenze (Italy)
Giuseppe Tondello, Univ. di Padova (Italy)
Giampiero Naletto, Univ. di Padova (Italy)
Piergiorgio Nicolosi, INFM/Univ. di Padova (Italy)
Luca Poletto, INFM/Univ. di Padova (Italy)


Published in SPIE Proceedings Vol. 3764:
Ultraviolet and X-Ray Detection, Spectroscopy, and Polarimetry III
Silvano Fineschi; Bruce E. Woodgate; Randy A. Kimble, Editor(s)

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