High Resolution Thermally Differentiated Images of the Chromosphere and Corona

Walker, Arthur B. C.; Hoover, Richard B.; Barbee, Troy W.

doi:10.1007/978-94-011-1964-1_7

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…On-disk X-ray and EUV observations soon made clear that the corona is multithermal (Walker et al, 1993). The corona's appearance differs markedly at distinct wavelengths corresponding to spectral emission lines formed at various temperatures, as illustrated in raster images obtained with the Hinode EUV Imaging Spectrometer (EIS; Fig.…”

Section: The Multithermal Coronamentioning

confidence: 99%

EUV imaging and spectroscopy for improved space weather forecasting

Golub

Cheimets

DeLuca

et al. 2020

J. Space Weather Space Clim.

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Accurate predictions of harmful space weather effects are mandatory for the protection of astronauts and other assets in space, whether in Earth or lunar orbit, in transit between solar system objects, or on the surface of other planetary bodies. Because the corona is multithermal (i.e., structured not only in space but also in temperature), wavelength-separated data provide crucial information that is not available to imaging methods that integrate over temperature. The extreme ultraviolet (EUV) wavelengths enable us to focus directly on high temperature coronal plasma associated with solar flares, coronal mass ejections (CMEs), and shocked material without being overwhelmed by intensity from the solar disk. Both wide-field imaging and spectroscopic observations of the solar corona taken from a variety of orbits (e.g., Earth, L1, or L5) using suitably-chosen EUV instrumentation offer the possibility of addressing two major goals to enhance our space weather prediction capability, namely: 1.) Improve our understanding of the coronal conditions that control the opening and closing of the corona to the heliosphere and consequent solar wind streams, and 2.) Improve our understanding of the physical processes that control the early evolution of CMEs and the formation of shocks, from the solar surface out into the extended corona.

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Section: The Multithermal Coronamentioning

confidence: 99%

EUV imaging and spectroscopy for improved space weather forecasting

Golub

Cheimets

DeLuca

et al. 2020

J. Space Weather Space Clim.

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show abstract

High resolution imaging with multilayer telescopes: resolution performance of the MSSTA II telescopes

et al. 2000

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The Multi-Spectral Solar Telescope Array (MSSTA) is a sounding rocket-borne observatory composed of a set of normalincidence multilayer-coated telescopes that obtained selected bandpass spectroheliograms (44A-1550A) of the Solar atmosphere. These spectroheliograms were recorded on specially fabricated XUV and FUV 70mm Kodak film. Rocket launches of this instrument payload took place in 1991 (MSSTA 1) and 1994 (MSSTA II) at the White Sands Missile Test Range in New Mexico, sponsored by the NASA sounding rocket experiment program. Immediately prior to the 1994 launch, visible light focusing tests of each telescope were performed in-situ using a 195 1 Standard Air Force High Resolution Testtarget, to measure optical resolution performance. We determined that the MSSTA II telescopes performed at diffractionlimited resolutions down to 0.70 arc-second at visible wavelengths. Based on these measurements, we calculated an upperbound to the focusing errors that incorporate the sum of all uncorrelated system resolution errors that affect resolution performance. Coupling these upper-bound estimates with the in-band diffraction limits, surface scattering errors and payload pointing jitter, we demonstrate that eleven of nineteen MSSTA II telescopeshaving negligible figures of focus errors in comparison to the corresponding visible diffraction limitsperformed at sub arc-second resolution at their operational FUV/EUV/XUV wavelengths during flight. We estimate the in-band performance down to 0.14 0.08 second of arc.

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High Resolution Thermally Differentiated Images of the Chromosphere and Corona

Cited by 2 publications

References 36 publications

EUV imaging and spectroscopy for improved space weather forecasting

EUV imaging and spectroscopy for improved space weather forecasting

High resolution imaging with multilayer telescopes: resolution performance of the MSSTA II telescopes

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