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  • Cell & Developmental Biology
  • SOLAR PHYSICS
  • 1975-1979  (483)
  • 1975  (483)
  • 1
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    A comparison of coronal X-ray structures of active regions with magnetic fields computed from photospheric observations (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-08-28
    Beschreibung: The appearances of several X-ray active regions observed on March 7, 1970 and June 15, 1973 are compared with the corresponding coronal magnetic-field topology. Coronal fields have been computed from measurements of the longitudinal component of the underlying magnetic fields, based on the current-free hypothesis. An overall correspondence between X-ray structures and calculated field lines is established, and the magnetic counterparts of different X-ray features are also examined. A correspondence between enhanced X-ray emission and the location of compact closed field lines is suggested. Representative magnetic-field values calculated under the assumption of current-free fields are given for heights up to 200 sec.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 44; Sept
    Format: text
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  • 2
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    Photochemistry of hydrocarbons in the Jovian upper atmosphere (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-07-27
    Schlagwort(e): SOLAR PHYSICS
    Format: text
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  • 3
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    Evidence for magnetic field line reconnection in the solar wind (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-07-27
    Beschreibung: The basic scheme of Petschek's (1963) models for slow and fast magnetic reconnection in the solar wind is reviewed in order to determine what sort of results one would expect from satellite observations of possible reconnection processes. Data from HEOS 1 and OGO 5 are then analyzed, in which four observations of neutral sheet structures with large change of magnetic field direction were made. All four may be interpreted as indicating magnetic line reconnections rather than as D-sheets because they all show two distinct discontinuities which bound a lower magnetic field intensity region. The geometry of the magnetic field in the reconnection region appears to be similar to that described by Petschek. In one case the reconnection rate is in agreement with Petschek's prediction, but in the other three cases it is much larger than his limit. The reconnection rates observed do, however, agree with Sonnerup's (1972) limit.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
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  • 4
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    The upstream escape of energized solar wind protons from the bow shock (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-27
    Beschreibung: The paper analyzes the geometry of escape from the bow shock for solar wind protons in order to determine under what conditions a proton reflected from the bow shock can escape upstream or not. Some numerical examples show that protons with rather high energies and pitch angles can escape the shock at only marginally quasi-parallel field orientations, even if they have quite moderate speeds parallel to B. This does not provide evidence that such high energy protons are produced at the bow shock, but does show that such protons can escape upstream with the characteristics observed by Lin et al. (1974). It is also possible that some particles will encounter the shock two or more times, their total energy compounding until it reaches a high level.-
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Anisotropy measurements of nearly 50 KeV solar protons (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: The Energetic Particles Experiment on IMP-7 measures the angular distribution of 50-200 keV solar protons in 16 sectors. The velocity of 50 keV protons may be less than 5 times that of the solar wind. A generalized nonlinear Compton-Getting point transformation into the co-moving frame that contains no assumptions as to the angular distribution of either the spectrum or intensity is presented. Nearly 50 keV proton data in the spacecraft frame exhibit an anisotropy ratio that is large (not less than 5) and radial throughout the October 29, 1972 event lasting more than 9 days at this energy. This anisotropy argues against impulsive injection and diffusive decay in the inner solar system. Application of the transformation to the data reveals a long lasting residual anisotropy in the co-moving frame with protons streaming from the sun. Differences between the co-moving frame and solar wind frame velocities suggest residual electric fields upstream from the bow shock.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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  • 6
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    Propagation characteristics of solar flare particles (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: A statistical study on the propagation characteristics of about 80 solar particle events is carried out using the data from Goddard cosmic-ray experiments. It is found that for particles near onset as well as maximum particle intensity at 1 AU, a linear relation exists between the velocity and the traveled distance. This holds for both relativistic electrons (0.5-1.1 MeV) and nonrelativistic protons (4-80 MeV). The relation indicates that particle propagation is independent of both rigidity and energy. It is shown that in general interplanetary diffusion plays a minor role in particle propagation during the initial phase of a flare effect. A study of the onset characteristics indicates that the speed of particle transport in the corona may be as high as 40 deg/hr. This behavior can not be accounted for by either magnetic-field or curvature drift.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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  • 7
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    Relation of large-scale coronal X-ray structure and cosmic rays. II - Coronal control of interplanetary injection of 300 keV protons (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: We report the striking coronal control of low-energy solar particles from the solar flare of September 7, 1973. The flare was at S18, W46 (Carrington longitude 188 deg) in McMath Plage Region 12307. We find strong intensity gradients in heliolongitude (about 10% per deg) that are nearly identical in protons, helium, and medium nuclei at energies about 0.5 MeV/nuc, as well as relativistic electrons and 3 MeV protons. This pervasive gradient occurs at longitudes over bright X-ray emission structures east of the flare site which interconnect large-scale chromospheric polarity regions identifiable in H-alpha filtergrams.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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  • 8
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    The solar wind between 0.7 AU and 5.0 AU (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: A review is given of Pioneer-9 (1968, 1969) and Pioneer-10 and 11 (1973) observations of the solar wind high-speed stream structure as a function of heliocentric distance. Evidence for spatial and temporal variations in this solar wind structure between 5 and 7 AU is presented as well as evidence for the importance of stream-stream interactions in the solar wind. As the high speed stream structure travels outward in the ecliptic plane from the sun, there is evidence of damping which is consistent with the exchange of momentum between the high speed streams and the low speed streams. These interactions may produce scattering centers which will prevent the observation of a significant galactic cosmic ray gradient. The width of the solar wind speed histograms are determined and radial distances on the order of 10 AU are calculated.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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  • 9
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    Relation of large-scale coronal X-ray structure and cosmic rays. IV - Amplitude of the diurnal variation in neutron monitors on interplanetary field lines orbiting above coronal holes (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Schlagwort(e): SOLAR PHYSICS
    Materialart: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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  • 10
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    The time and spatial behavior of solar flare proton anisotropies observed in deep space on Pioneers 10 and 11 (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The anisotropy of solar flare protons from the direction of the 'garden hose' magnetic field line has been analyzed for 24 events observed by the University of Chicago experiment on Pioneers 10 and 11 in 1972 and 1973. The anisotropy versus time profiles during individual events are in general consistent with diffusive propagation, but several cases are observed where the decay is better described by an exponential time decay. The anisotropy amplitude evaluated at the time of maximum intensity for each event shows evidence for a gradual decrease with increasing distance from the sun which is qualitatively consistent with diffusive propagation and suggests that the effective interplanetary diffusion coefficient parallel to the magnetic field increases slowly with heliocentric distance.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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