Simultaneous imaging and spectroscopy of the solar atmosphere: advantages and challenges of a 3‐order slitless spectrograph

dc.contributor.authorKankelborg, Charles
dc.contributor.authorThomas, Roger J.
dc.date.accessioned2016-03-31T14:17:19Z
dc.date.available2016-03-31T14:17:19Z
dc.date.issued2001-12-10
dc.description.abstractThe dynamic solar atmosphere poses a severe observational challenge for imaging spectroscopy in EUV. The traditional method of building up images by rastering a slit spectrograph has so far proven too slow to keep up with the Sun's rapidly changing transition region and corona. We describe a new approach, using a slitless imaging spectrograph operating in a narrow band, with imaging detectors at three orders. This arrangement offers cotemporal imaging and spectroscopy at high spatial, spectral, and temporal resolution. The prospect of disentangling spatial and spectral information is greatly improved by choosing a narrow band containing only two spectral lines, and by imaging at several spectral orders. This paper discusses several advantages and challenges of the multi­order slitless approach. We derive a mathematical description of the null space of spatial­spectral signatures to which an ideal three­order slitless spectrograph has zero response. An exploration of the null space helps to clarify the capabilities and limitations of this instrument type. We infer that the three­order slitless spectrograph is sensitive to line intensity, doppler shift and line width; but insensitive to line asymmetry. Strategies are developed to minimize the ambiguity in interpreting the multi­order data. A proof of concept sounding rocket payload, the Multi­Order Solar EUV Spectrograph (MOSES), is under development with an anticipated launch in Spring, 2004.en_US
dc.description.sponsorshipThe MOSES sounding rocket pro ject is supported by NASA grant NAG5-10997.en_US
dc.identifier.citationKankelborg, Charles C., and Roger J. Thomas. "Simultaneous imaging and spectroscopy of the solar atmosphere: advantages and challenges of a 3-order slitless spectrograph", Proceedings of the SPIE 4498, UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics, 16-26 (December 10, 2001), doi:10.1117/12.450074en_US
dc.identifier.issn0277-786X
dc.identifier.urihttps://scholarworks.montana.edu/handle/1/9661
dc.titleSimultaneous imaging and spectroscopy of the solar atmosphere: advantages and challenges of a 3‐order slitless spectrographen_US
dc.typeArticleen_US
mus.citation.conferenceUV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics; Oswald H. W. Siegmund, Silvano Fineschi, Mark A. Gummin; San Diego, CA, USA; July 29, 2001en_US
mus.citation.extentfirstpage16en_US
mus.citation.extentlastpage26en_US
mus.citation.journaltitleProceedings of the SPIE 4498, UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physicsen_US
mus.citation.volume4498en_US
mus.data.thumbpage3en_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.identifier.doi10.1117/12.450074en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentPhysics.en_US
mus.relation.universityMontana State University - Bozemanen_US

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