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  • 1
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    HRTS results from Spacelab 2 (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The High Resolution Telescope and Spectrograph (HRTS) instrument flew on the Spacelab 2 mission and consisted of a 30-cm Gregorian telescope, a slit spectrograph covering the 1190-1680 A region with 0.05-A spectral resolution, a broadband (90 A FWHM) spectroheliograph tuned to 1550 A, and an H-alpha filter system. The spectrograph slit was 920 arcsec, approximately in length. Subarcsecond spatial resolution along the slit is possible, but because of jitter in the Spacelab Instrument Pointing System, good exposures actually achieved 1-2 arcsec resolution.
    Keywords: SOLAR PHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 6; 8, 19; 263-272
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  • 2
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    Solar plages and the interpretation of stellar Ca 2 H and K line variations in late type dwarfs (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Approximately a dozen late type dwarf stars have been observed by Wilson (1978) to undergo cyclic variability in Ca II H and K line emission which seems analogous to the solar activity cycle. What might be learned about these stars from solar analogies? The Ca II K index is estimated variation of the Sun viewed as a star, and compared with the observed range of Wilson's stellar observations. Results indicate trends of increasing relative variation H-K(max)/H-K(min) with later spectral type, due to decreasing dilutional contribution of residual photospheric flux to a 1 A band at line center, and of increasing relative variation with decreasing relative time of rise to maximum tau rise/tau reminiscent of the observed solar correlation of a quick rise to sunspot maximum with a strong cycle.
    Keywords: SOLAR PHYSICS
    Type: Smithsonian Astrophysics Observatory 2nd Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, Vol. 1; p 181-189
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  • 3
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    Correspondence between solar fine-scale structures in the corona, transition region, and lower atmosphere from collaborative observations (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Soft X-Ray Imaging Payload and the High Resolution Telescope and Spectrograph (HRTS) instrument were launched from White Sands on 11 December 1987 in coordinated sounding rocket flights to investigate the correspondence of coronal and transition region structures, especially the relationship between X-ray bright points (XBPs) and transition region small spatial scale energetic events. The coaligned data from X-ray images are presented along with maps of sites of transition region energetic events observed in C IV (100,000 K), HRTS 1600 A spectroheliograms of the T sub min region and ground based magnetogram and He I 10830 A images.
    Keywords: SOLAR PHYSICS
    Type: American Science and Engineering, Inc., Solar X-ray Astronomy Sounding Rocket Program; 26 p
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  • 4
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    High resolution telescope and spectrograph observations of solar fine structure in the 1600 A region (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: High spatial resolution spectroheliograms of the 1600 A region obtained during the HRTS rocket flight of 1978 February 13 are presented. The morphology, fine structure, and temporal behavior of emission bright points (BPs) in active and quiet regions are illustrated. In quiet regions, network elements persist as morphological units, although individual BPs may vary in intensity while usually lasting the flight duration. In cell centers, the BPs are highly variable on a 1 minute time scale. BPs in plages remain more constant in brightness over the observing sequence. BPs cover less than 4 percent of the quiet surface. The lifetime and degree of packing of BPs vary with the local strength of the magnetic field.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 270; July 15
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  • 5
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    Latitudinal anisotropy of the solar far ultraviolet flux - Effect on the Lyman alpha sky background (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An estimate is given for the anisotropy of the solar full disk flux in the far ultraviolet, as it would be observed for lines of sight within and above the ecliptic plane through the predominant influence of plages at low heliocentric latitudes. The flux anisotropy for Lyman alpha, at a level of solar activity with a sunspot number of roughly 160, is approximately 0.88 for the integrated flux over the Lyman alpha profile and 0.83 for the flux at line center. The effect of this Lyman alpha flux anisotropy on the Lyman alpha sky background intensity, resonantly backscattered from the local interstellar medium that is streaming through the solar system, is examined. It is concluded that the solar Lyman alpha anisotropy should be included in models of the interplanetary background during periods of moderate to high solar activity.
    Keywords: SOLAR PHYSICS
    Type: Astronomy and Astrophysics; 97; 2, Ap; Apr. 198
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  • 6
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    The chromosphere and transition region (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The physical processes occurring as a result of the transfer of energy and momentum from the primary solar flare energy release site in the corona to the underlying chromosphere and transition region during the course of the flare are investigated through a comparison of theoretical models and observational data. Static, dynamic and hydrodynamic models of the lower-temperature chromospheric flare are reviewed. The roles of thermal conduction, radiation, fast particles and mass motion in chromosphere-corona interactions are analyzed on the basis of Skylab UV, EUV and X-ray data, and empirical and synthetic models of the chromospheric and upper photospheric responses to flares are developed. The canonical model of chromospheric heating during flares as a result of primary energy release elsewhere is found to be justified in the chromosphere as a whole, although not entirely as the temperature minimum, and a simplified model of horizontal chromospheric flare structure based on results obtained is presented.
    Keywords: SOLAR PHYSICS
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  • 7
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    Variability of the solar flux in the far ultraviolet 1175-2100 A (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An attempt is made to correlate available observations within the framework of a simple two-component model of the full-disk flux which divides the solar surface into quiet and active areas with a constant average contrast factor for the intensity at a particular wavelength. The expected range of variability over the solar cycle of the far UV flux is examined within the 1175-2100 A wavelength range. Two possible indices of solar variability, the calcium plage index and the Zurich sunspot number, are investigated as guides to the fraction of disk covered by active regions and the possible resulting flux variability. In addition, contrast factors I(plage)/I(quiet region) are determined for various lines and continua, and the fraction of the disk covered by plages at various times is estimated. Results are in good agreement with the L-alpha fluxes of Vidal-Madjar (1975) and the broadband observations by Hinteregger (1979), but disagree with the flux variability reported by Heath and Thekaekara (1977) over the 1700-3000 A range.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 85; May 1
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  • 8
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    New atlas of IR solar spectra (1980)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Over 4500 absorption lines have been marked on the spectra and the corresponding line positions tabulated. The associated absorbing telluric or solar species for more than 90% of these lines have been identified and only a fraction of the unidentified lines have peak absorptions greater than a few percent. The high resolution and the low Sun spectra greatly enhance the sensitivity limits for identification of trace constituents.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-163499
    Format: application/pdf
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  • 9
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    Elemental composition of solar energetic nuclei (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: It is found for four major solar-flare events that the average solar energetic particle (SEP) abundances are similar to abundances in the solar wind and to recent coronal measurements. The average SEP and galactic cosmic-ray source abundances are also similar for elements with nuclear charge in the range 8-28, but are different for helium, carbon, and nitrogen.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal
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  • 10
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    Quiet sun observations of the Al I autoionization lines lambda 1932 and lambda 1936 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Quet sun observations obtained during a rocket flight of the Al I autoionization lines 1932 A and 1936 A at solar pointings ranging from mu = 0.73 out to the visible limb. Absolute intensities are estimated to be accurate to about + or - 20%. These lines weaken progressively with decreasing mu but never go into emission before finally disappearing with the continuum just beyond the visible solar limb. The observations are then compared with LTE line profiles computed through the quiet sun atmosphere of Vernazza et al. (1976). Several areas of disagreement between the synthetic and observed profiles are discussed.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 76; Feb. 198
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