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Article
Observations of Coronal Structures Above an Active Region by Eit and Implications for Coronal Energy Deposition
Solar EUV images recorded by the EUV Imaging Telescope (EIT) on SOHO have been used to evaluate temperature and density as a function of position in two largescale features in the corona observed in the temper...
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Article
Eit Observations of the Extreme Ultraviolet Sun
The Extreme Ultraviolet Imaging Telescope (EIT) on board the SOHO spacecraft has been operational since 2 January 1996. EIT observes the Sun over a 45 x 45 arc min field of view in four emission line groups: F...
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Chapter
EIT Observations of the Extreme Ultraviolet Sun
The Extreme Ultraviolet Imaging Telescope (EIT) on board the SOHO spacecraft has been operational since 2 January 1996. EIT observes the Sun over a 45 × 45 arc min field of view in four emission line groups: F...
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Chapter and Conference Paper
Solar EUV Rocket Telescope and Spectrograph (SERTS) Observations of Fe XII Emission Lines
Theoretical electron density sensitive emission line ratios involving transitions in the 186–383 Å wavelength range are compared with observational data for a solar active region and a subflare, obtained by the S...
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Article
EIT: Extreme-ultraviolet Imaging Telescope for the SOHO mission
The Extreme-ultraviolet Imaging Telescope (EIT) will provide wide-field images of the corona and transition region on the solar disc and up to 1.5 R⊙ above the solar limb. Its normal incidence multilayer-coate...
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Chapter
EIT: Extreme-UltraViolet Imaging Telescope for the SOHO Mission
The Extreme-ultraviolet Imaging Telescope (EIT) will provide wide-field images of the corona and transition region on the solar disc and up to 1.5 R⊙ above the solar limb. Its normal incidence multilayer-coated o...
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Article
Mgix emission lines in an active region spectrum obtained with the Solar EUV Rocket Telescope and Spectrograph (SERTS)
Theoretical electron-temperature-sensitive Mgix emission line ratios are presented forR I =I(443.96 Å)/I(368.06 Å),R 2 =I(439.17 Å)/I(368.06 Å),R 3 =I(443.37 Å)/I(368.06 Å),R 4 =I(441.22 Å)/I(368.06 Å), andR 5 =I
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Article
Correlation of He II lyman alpha with He I 10830 Å, and with chromospheric and EUV coronal emission
This paper describes the results of comparing SERTS-3 images obtained in the transition region line of Heii 304 Å with chromospheric Hei 10830 Å absorption, with strong coronal lines of Mgix 368 Å, Fexv 284 Å and...
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Article
A comparison of theoreticalCIV emission line strengths with active region observations obtained with the Solar EUV Rocket Telescope and Spectrograph (SERTS)
Theoretical line ratios involving 2s 2 S - 3p 2 P, 2p 2 P - 3s 2 S, and 2p 2 S - 3d 2 D transitions inCiv between 312 and 420 Å are presented. A comparison of these with solar active region observational data obt...
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Article
Diagnostic application of highly ionized iron lines in the XUV spectrum of a solar flare
Recent atomic data have been used to analyze a solar flare spectrum obtained with the Goddard Space Flight Center's grating spectrometer on the OSO-5 satellite. There exist in the wavelength region 90–200 Å st...
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Article
Science on the Space Shuttle
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Article
A solar extreme ultraviolet telescope and spectrograph for Shuttle/Spacelab
An instrument for advanced studies of the solar corona is described. Its optical system provides nearly stigmatic imaging of selected portions of the Sun over the spectral range from 22.5 to 44.0 nm. Both spec...
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Article
On coronal Fe abundances and temperatures from XUV emission lines
Data obtained by the OSO-7 spectroheliograph on strong XUV lines of five, different Fe ions from the outer equatorial corona are presented. Interpretation of the data with a spherically symmetric model atmosph...
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Article
Coronal temperatures and temperature gradients from OSO-7 spectroheliograms
Temperatures and temperature gradients for the outer corona are obtained from brightness gradients of EUV lines that were measured with the spectroheliograph on OSO-7. Brightness gradients show considerable de...
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Article
The solar physics Shuttle/Spacelab program and its relationship to studies of the flare build-up
The Shuttle/Spacelab program offers an exciting and substantial opportunity for flight of sophisticated instruments for solar research in the 1980's. Problem-oriented missions composed of a number of instrumen...
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Article
Implications for flare build-up and heating from observations made by OSO-7
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Article
OSO-7 results on coronal emission near 304 Å
The spectral composition and spatial distribution of equatorial coronal emission near 304 Å is examined. Spectral scans indicate that the predominant line is from Si xi. Comparisons of observations with calculati...
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Article
Energy balance in a magnetically confined coronal structure observed by OSO-7
A model of a coronal region of enhanced Fexv and Fexvi emission is developed and its energy balance is examined using extreme ultraviolet observations from OSO-7 together with calculations of possible force-free ...
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Article
Observation of possible Fe xvii 2p 53p(1S0)-2p 53s(1 P 1, 3 P 1) transitions in spectra of a solar active region and flare
Expected wavelengths and relative intensities are obtained, from calculations of other workers, for the hitherto unobserved transitions 2p 53p(1 S 0)-2p ...
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Article
Abundance of Fe relative to H at 1.5 solar radii
The abundance of Fe relative to H is obtained by using resonantly scattered intensities of λ 284 of Fe XV that were measured with OSO-7 and resonantly scattered intensities of Lα of H I that were obtained by Gabr...
