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Earth and Jupiter: Comparison of magnetopause structure (1979)

Hill, C. W. ; Reiff, P. H.

In: Other Sources

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Publikationsdatum: 2019-06-27

Beschreibung: Using published data from the Jovian magnetopause crossings of Pioneers 10 and 11, the apparent crossing times as determined from the solar wind plasma detector and from the vector magnetometer are comapred. There were 13 published crossings for which both plasma and magnetic-field signatures were clearly defined. The occurrence distribution of these 13 crossings with respect to the relative timing of plasma and field signatures is shown. Results indicate that Jupiter's magnetopause is more turbulent than the Earth's possibly as the result of the large velocity shear between the magnetosheath and the partially corotating Jovian plasma. However, it is noted that the data set considered is too small to justify a definitive interpretation.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: ESA Magnetospheric Boundary Layers; p 227-228

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Interactions of the plasma sheet with the lunar surface at the Apollo 14 site (1976)

Burke, W. J. ; Reiff, P. H.

In: Other Sources

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Publikationsdatum: 2019-06-27

Beschreibung: Calculations of the magnetic shadow zones of lunar-based particle detectors are extended to include the effects of local remanent magnetic fields. At the Apollo 14 site, the local magnetic field is approximated as that of a dipole. Numerically calculated open and shadowed zones are shown to be in agreement with quiet-time plasma-sheet observations of the charged-particle lunar-environment experiment. An analysis of three storm-time observations indicates that magnetic shadowing can significantly alter the near-lunar-surface electrostatic potential distribution.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Journal of Geophysical Research; 81; Sept. 1

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3

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Magnetic shadowing of charged particles by an extended surface (1976)

Reiff, P. H.

In: Other Sources

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Publikationsdatum: 2019-06-27

Beschreibung: The problem of particle shadowing by the lunar surface is examined. Shadow zones are obtained analytically for small-aperture detectors on an infinite flat surface and are shown to be in good agreement with those obtained by numerical trajectory tracing. The shadow zones cover about half of all possible external field orientations for a vertical detector, which may result in serious underestimations of the frequency of observation of a particular plasma region. Shadowing may cause wide variations between observed and actual pitch angle distributions even in the case of multiple- or large-aperture detectors. Since the particle flux can be considered approximately isotropic only for magnetic fields within 35 deg of the surface normal, the electron flux to the surface may be overestimated in current balance calculations ignoring the magnetic field direction. In addition, photoelectrons may be returned to the surface by the magnetic field.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Journal of Geophysical Research; 81; July 1

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4

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The effect of local magnetic fields on the lunar photoelectron layer while the moon is in the plasma sheet (1975)

Reiff, P. H. ; Reasoner, D. L. ; Burke, W. J.

In: Other Sources

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Publikationsdatum: 2019-07-13

Beschreibung: Data from the Charged Particle Lunar Environment Experiment (CPLEE), at the Apollo 14 site, are used to investigate the interactive properties of the plasma sheet and the lunar photoelectron layer. It is shown that the predictions of the Guernsey-Fu model are compatible with SIDE but not CPLEE observations. The apparent contradiction is resolved by fitting the remanent magnetic field to that of a dipole buried about 1.1 km beneath the surface. In this case a charge separation layer must form above the instrument due to the different rigidities of plasma sheet electrons and protons. The qualitative properties of the charge separation layer needed to reconcile CPLEE and SIDE observations are presented.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX

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