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  • Other Sources  (35)
  • Launch Vehicles and Launch Operations  (22)
  • SOLAR PHYSICS  (13)
  • 2005-2009  (22)
  • 1975-1979  (13)
  • 1
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    Constellation Launch Vehicles Overview (2009)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This slide presentation reviews the current status of the launch vehicles associated with the Constellation Program. These are the Ares I and the Ares V. An overview of the Ares launch vehicles is included. The presentation stresses that the major criteria for the Ares I launcher is the safety of the crew, and the presentation reviews the various features that are designed to assure that aim. The Ares I vehicle is being built on a foundation of proven technologies, and the Ares V will give NASA unprecedented performance and payload volume that can enable a range of future missions. The CDs contain videos of scenes from various activities surrounding the design, construction and testing of the vehicles.
    Keywords: Launch Vehicles and Launch Operations
    Type: Human Space Flight Review; Jul 29, 2009; Huntsville, AL; United States
    Format: text
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  • 2
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    Determination of the structure and heating mechanisms of coronal loops from soft X-ray observations with the solar probe (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: High resolution soft X-ray imaging from the solar probe is justified in terms of the expected scientific returns which include the determination of the temperature and density structure of a coronal loop. The advantages of the grazing incidence telescope over the multiple pinhole camera are discussed. An instrument package is described which includes a grazing incidence mirror, a thermal prefilter, a three position filter wheel and a focal plane detector baselined as an 800 by 800 back-illuminated charge coupled device. The structural assembly together with the data processing equipment would draw heavily on the designs being developed for the Solar Polar Mission.
    Keywords: SOLAR PHYSICS
    Type: JPL A Close-up of the Sun; p 94-110
    Format: text
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  • 3
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    Dielectronic recombination rates, ionization equilibrium, and radiative energy-loss rates for neon, magnesium, and sulfur ions in low-density plasmas (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Results of detailed and systematic calculations are presented for the total dielectronic recombination rate coefficients for the ions of Ne, Mg, and S in a low-density predominantly hydrogen plasma. The new recombination rates are used to calculate solar corona ionization-equilibrium distributions of the ions. The most important effect of dielectronic recombination for ions in corona equilibrium is found to be a shift in the maximum-abundance temperatures toward higher temperatures, which are in some cases reduced from those predicted on the basis of the simple Burgess formula.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 230
    Format: text
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  • 4
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    Comparison of flare bremsstrahlung resulting from energetic thermal and nonthermal electrons (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper investigates the behavior of the X-ray bremsstrahlung spectra resulting from two distinct types of electron distribution functions impinging on a target atmosphere during flare activity. A power-law distribution function is compared with two double-peaked Maxwellians. The results of these calculations show that it would be difficult to rule out multithermal interpretations for the emitted high-energy X-rays.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 51; Jan
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  • 5
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    Solar wind stream structure during the early phase of solar cycles 20 and 21 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 60; Nov. 197
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  • 6
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    The relationship between solar activity and coronal hole evolution (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The relationship between coronal hole evolution and solar active regions during the Skylab period is examined. A tendency is found for holes to grow or remain stable when the activity nearby, seen as calcium plages and bright regions in X-rays, is predominantly large, long-lived regions. It is also found that there is a significantly higher number of small, short-lived active regions, as indicated by X-ray bright points, in the vicinity of decaying holes than there is near other holes. This is interpreted to mean that holes disappear at least in part because they become filled with many small scale, magnetically closed, X-ray emitting features. This interpretation, together with the observation that the number of X-ray bright points was much larger near solar minimum than it was during the Skylab period, provides a possible explanation for the disappearance of the large, near-equatorial coronal holes at the time of solar minimum.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 60; Nov. 197
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  • 7
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    Strong convective and shock wave behavior in solar flares (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A model has been developed to study the gasdynamics of a flare region heated by a stream of energetic electrons. It is shown that the energy deposition can introduce strong chromospheric dynamical effects. As a result of fluid motion into rarefied regions, there is considerable redistribution of mass causing a profound influence on the emitted line radiation.
    Keywords: SOLAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 18; Aug. 197
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  • 8
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    Solar cycle variation of magnetic flux emergence (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The number of X-ray bright points (XBP) has been measured from solar X-ray images obtained during two rocket flights in 1976. When compared with the data obtained during the Skylab mission (1973), the number is found to be higher by a factor of 2. As the probability of obtaining the result by chance is less than 1 in 5 million, it is concluded that the number of XBP has increased in the three year interval. As all other indicators of activity have decreased between 1973 and 1976, the cyclical variation of the short-lifetime end of the magnetic-flux-emergence spectrum is out of phase with the solar cycle as defined by active regions or sunspots. Since XBP in 1973 contributed more to the emerging magnetic flux than did active regions, the possibility exists that the total amount of emerging magnetic flux may be maximized at a sunspot minimum.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 214
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  • 9
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    The interpretation of simultaneous soft X-ray spectroscopic and imaging observations of an active region (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Simultaneous soft X-ray spectroscopic and broad-band imaging observations of an active region have been analyzed together to determine the parameters which describe the coronal plasma. From the spectroscopic data, models of temperature-emission measure-elemental abundance have been constructed which provide acceptable statistical fits. By folding these possible models through the imaging analysis, models which are not self-consistent can be rejected. In this way, only the oxygen, neon, and iron abundances of Pottasch (1967), combined with either an isothermal or exponential temperature-emission-measure model, are consistent with both sets of data. Contour maps of electron temperature and density for the active region have been constructed from the imaging data. The implications of the analysis for the determination of coronal abundances and for future satellite experiments are discussed.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 45; Dec. 197
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  • 10
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    A comparison of solar wind streams and coronal structure near solar minimum (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Solar wind data from the MIT detectors on the IMP 7 and 8 satellites and the SOLRAD 11B satellite for the solar-minimum period September-December, 1976, were compared with X-ray images of the solar corona taken by rocket-borne telescopes on September 16 and November 17, 1976. There was no compelling evidence that a coronal hole was the source of any high speed stream. Thus it is possible that either coronal holes were not the sources of all recurrent high-speed solar wind streams during the declining phase of the solar cycle, as might be inferred from the Skylab period, or there was a change in the appearance of some magnetic field regions near the time of solar minimum.
    Keywords: SOLAR PHYSICS
    Type: Geophysical Research Letters; 4; July 197
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