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  • ASTROPHYSICS  (3)
  • SOLAR PHYSICS  (3)
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1985-1989  (7)
  • 1975-1979
  • 1987  (7)
  • 1
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    Flare research with the NASA/MSFC vector magnetograph - Observed characteristics of sheared magnetic fields that produce flares (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The present MSFC Vector Magnetograph has sufficient spatial resolution (2.7 arcsec pixels) and sensitivity to the transverse field (the noise level is about 100 gauss) to map the transverse field in active regions accurately enough to reveal key aspects of the sheared magnetic fields commonly found at flare sites. From the measured shear angle along the polarity inversion line in sites that flared and in other shear sites that didn't flare, evidence is found that a sufficient condition for a flare to occur in 1000 gauss fields in and near sunspots is that both: (1) the maximum shear angle exceed 85 degrees; and (2) the extent of strong shear (shear angle of greater than 80 degrees) exceed 10,000 km.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 113; 1-2,; 347-352
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Multichannel optical correlator/convolver utilizing the magnetooptic spatial light modulator (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The paper describes a multichannel correlator/convolver architecture utilizing an acoustooptic light modulator for the one dimensional channel and a magnetooptic spatial light modulator (MOSLM) for the second two-dimensional parallel channel. The MOSLM allows greater parallelism to be implemented in this correlator/convolver design than was previously reported. The implementation of 24 parallel channels with a 48 x 48 device is demonstrated. Experimental data are presented and the ways of increasing the number of parallel channels using commercially available MOSLMs and other previously discussed techniques, such as frequency multiplexing, are discussed. It is shown that over 2000 parallel channels are possible at 32-bit accuracy. A technique for obtaining a limited gray scale is also discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 26; 2479-248
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    NASA TECHNICAL REPORTS
  • 3
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    Impact and cratering processes on asteroids, satellites, and planets (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A new model for scaling the outcome of catastrophic collisions from laboratory scale experiments was developed and applied to large bodies where gravitational binding is dominant. This algorithm includes a pressure dependent impact strength which predicts that large asteroids behave as intrinsically strong objects due to compressive loading of overburden throughout their interiors. For small bodies, where the gravitational loading is negligible, this model assumes that the impact strength is independent of size. There was considerable discussion of scaling laws for disruption when these results were presented to one authors colleagues. The pressure strengthening impact strength model was viewed as physically quite plausible; however, it was argued that the impact strength should decrease with increasing size in the size range where gravitational compression is negligible.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 399-401
    Format: application/pdf
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  • 4
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    Collisional and dynamical processes in moon and planet formation (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Research on a variety of dynamical processes relevant to the formation of planets, satellites and ring systems is discussed. The main focus is on studies of accretionary formation of early protoplanets using a numerical model, structures and evolution of ring systems and individual bodies within planetary rings, and theories of lunar origin.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 112-114
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  • 5
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    Accumulation of solid bodies in the solar nebula (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Research on the accumulation of solid bodies in the solar nebula is discussed. Studies of the earliest stage of accumulation of solid bodies in the solar system, which occured in the presence of the gaseous component of the solar nebula, are discussed. The combined effects of gas drag and gravitational perturbations of a planetary embryo on the orbital evolution of planetesimals, the effects of resonant trapping on planetesimals, and planetary mass accretion are discussed.
    Keywords: SOLAR PHYSICS
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 106-107
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  • 6
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    Research in particles and fields (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The astrophysical aspects of cosmic rays and gamma rays and the radiation and electromagnetic field environment of the Earth and other planets are investigated. These investigations are carried out by means of energetic particle and photon detector systems flown on spacecraft and balloons. Particle astrophysics is directed toward the investigation of galactic, solar, interplanetary, and planetary energetic particles and plasmas. The emphasis is on precision measurements with high resolution in charge, mass, and energy. Gamma ray research is directed toward the investigation of galactic, extragalactic, and solar gamma rays with spectrometers of high angular resolution and moderate energy resolution carried on spacecraft and balloons.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-180173 , NAS 1.26:180173
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    NASA TECHNICAL REPORTS
  • 7
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    The plasma and magnetic field properties of coronal loops observed at high spatial resolution (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Two data sets are analyzed in order to improve understanding of the plasma and magnetic field properties of active region coronal loops. Each set consists of coaligned, high spatial resolution soft X-ray, microwave, and magnetogram images that are used to compare observations of coronal loops and their feet in the photosphere and to constrain possible microwave emission mechanisms. The loops are found to have plasma parameters typical of quiescent active region loops. Each loop has a compact microwave source with peak brightness temperature T(b) = 1-2.5 x 10 to the 6th K cospatial with or near the loop apex. No complete loops are imaged in microwaves. The loop emission observed at 4.9 GHz is best described by fourth harmonic gyroresonance emission from a dipole loop model, but with less field variation along the loop than in the models of Holman and Kundu (1985).
    Keywords: SOLAR PHYSICS
    Type: AD-A188665 , AFGL-TR-87-0316 , Astrophysical Journal, Part 1 (ISSN 0004-637X); 315; 716-728
    Format: text
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