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11

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Spiral feature observed at top of rotating thunderstorm (1981)

Adler, R. F. ; Moore, D. A. ; Fenn, D. D.

In: Other Sources

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Publikationsdatum: 2011-08-18

Beschreibung: A dark spiral feature is noted in the geosynchronous satellite visible image of the top of a thunderstorm which also has a Doppler radar-observed mesocyclone. Although the evidence is not conclusive, the feature may represent cyclonic rotation at cloud top associated with the pre-tornado mesocyclone.

Schlagwort(e): METEOROLOGY AND CLIMATOLOGY

Materialart: Monthly Weather Review; 109; May 1981

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12

Unbekannt

Simultaneous stratospheric measurements of H2O, HDO, and CH4 from balloon-borne and aircraft infrared solar absorption spectra and tunable diode laser laboratory spectra of HDO (1984)

Fridovich, B. ; Seals, R. K., Jr. ; Goldman, A. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-18

Schlagwort(e): GEOPHYSICS

Materialart: Journal of Geophysical Research (ISSN 0148-0227); 89; 7259-726

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13

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Evidence for slow-mode shocks in the deep geomagnetic tail (1984)

Mccomas, D. J. ; Slavin, J. A. ; Gosling, J. T. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-18

Beschreibung: Plasma and field data from the ISEE-3 space probe provide evidence that the lobe-plasma sheet boundary is the central part of the distant geomagnetic tail is often a slow-mode shock. Such shocks are predicted by Petchek's (1964) model of the reconnection. If this model applies, then the ISEE-3 observations place the general location of the reconnection diffusion region closer to the earth than x of about -100 earth radii.

Schlagwort(e): GEOPHYSICS

Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 599-602

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14

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Detailed examination of a plasmoid in the distant magnetotail with ISEE 3 (1984)

Zwickl, R. D. ; Birn, J. ; Feldman, W. C. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: Details of an investigation of a lone plasmoid encountered by the ISEE-3 spacecraft in February 1983 are reported. ISEE-3 was then at 217 earth radii distance, in the magnetosheath, and had entered the magnetotail. Intense energetic particle, plasma and magnetic field fluctuations were detected, indicating a large electron flux moving tailward, a suprathermal proton flux, a jump in electron temperature, and inverse signatures of an increasing magnetic field. Closed magnetic field lines were also detected as were IMF field lines around the plasmoid and open field lines connecting the earth with space. The hot particles in the plasmoid are concluded to have been magnetically confined in a boundary one earth radius thick. An earthward directed beam was also detected and was found to balance the tailward flux. The origin and characteristics of the beam were not discerned.

Schlagwort(e): GEOPHYSICS

Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 1046-104

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15

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Simultaneous observation of the plasma sheet in the near earth and distant magnetotail - ISEE-1 and ISEE-3 (1984)

Hovestadt, D. ; Scholer, M. ; Tsurutani, B. T. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: Particle data have been acquired by the 1981-025 and 1982-019 spacecraft at geosynchronous orbit, as well as ISEE-1 in the near earth geomagnetic tail, and ISEE-3 in the distant geomagnetic tail. These observations are supplemented by ground-based magnetograms from near local midnight stations. Attention is given to a substorm recovery phase, and to observations of ion beams at the plasma sheet boundary in the near earth and distant tail, respectively, which are found to flow in opposite directions.

Schlagwort(e): GEOPHYSICS

Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 1034-103

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16

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Planetary radio astronomy observations from Voyager 1 near Saturn (1981)

Carr, T. D. ; Kaiser, M. L. ; Warwick, J. W. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: The Voyager 1 planetary radio astronomy experiment detected two distinct kinds of radio emissions from Saturn. The first, Saturn kilometric radiation, is strongly polarized, bursty, tightly correlated with Saturn's rotation, and exhibits complex dynamic spectral features somewhat reminiscent of those in Jupiter's radio emission. It appears in radio frequencies below about 1.2 megahertz. The second kind of radio emission, Saturn electrostatic discharge, is unpolarized, extremely impulsive, loosely correlated with Saturn's rotation, and very broadband, appearing throughout the observing range of the experiment (20.4 kilohertz to 40.2 megahertz). Its sources appear to lie in the planetary rings.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Science; 212; Apr. 10

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17

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Broadband electrostatic noise and field-aligned currents in Jupiter's middle magnetosphere (1981)

Barbosa, D. D. ; Gurnett, D. A. ; Kurth, W. S. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: Voyager 1 plasma wave observations have revealed the presence of an impulsive electrostatic emission localized to the Jovian middle magnetosphere that appears on the edges of the plasma sheet. This plasma mode has the same spectral and morphological characteristics of an emission that has been extensively studied in the earth's magnetosphere and has been associated with the presence of field-aligned currents. The results of a detailed study of the properties of this Jovian emission are presented by using comparisons with terrestrial observations as a basis for mode identification. The occurrence regions of the waves are compared with the measured magnetic field configuration to establish a correspondence with the plasma sheet. It is argued that this is a quasi-permanent global system of field-aligned currents linking the ionosphere of Jupiter to the middle magnetosphere, which powers energetic plasma heating processes occurring there. On the basis of knowledge of the consequences of field-aligned currents in the terrestrial magnetosphere, a scenario for acceleration/precipitation of inverted V electrons, concomitant aurorae, and energetic (approximately 10 keV) proton deposition into the middle magnetosphere resulting from field-aligned potential drops associated with this current system is suggested.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Journal of Geophysical Research; 86; Sept. 30

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18

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Extreme ultraviolet observations from Voyager 1 encounter with Saturn (1981)

Smith, G. R. ; Pomphrey, R. B. ; Shemansky, D. E. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: Hydrogen Lyman-alpha, helium and molecular hydrogen band ultraviolet emissions from Saturn and the Titan atmosphere are considered. The Saturn H2 band excitation mechanism, while qualitatively similar to that of Jupiter, is closely related to the solar flux. The occurrence of auroras at 80 deg latitude suggests an earth-like magnetotail activity. No ion emissions have been detected from the Saturn magnetosphere. Although nitrogen emissions excited by particles have been detected in the Titan dayglow and bright limb scans, no such emission has been detected from its dark atmosphere. Enhancement of the nitrogen emission is observed in the region of interaction between Saturn's corotating plasmasphere and the Titan atmosphere.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Science; 212; Apr. 10

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19

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Report of the NASA working group on tropospheric program planning (1981)

Stewart, R. W. ; Allario, F. ; Bandeen, W. R. ; [weitere]

In: CASI

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Publikationsdatum: 2019-06-28

Beschreibung: Increased understanding of the chemical phenomena occurring in the troposphere was the research goal. Emphasis was placed on tropospheric impact on environmental quality, including public health, agriculture, climate, and weather.

Schlagwort(e): GEOPHYSICS

Materialart: NASA-RP-1062 , L-13855

Format: application/pdf

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Überblick

20

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Titan (1984)

Hunten, D. M. ; Samuelson, R. E. ; Tomasko, M. G. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: It is pointed out that Titan, which is the second largest satellite in the solar system, is considerably larger than Mercury. It is made unique by its dense atmosphere, which consists mainly of nitrogen, although a substantial component of methane is present. The basic properties of Titan are summarized in a table. Many of the data were obtained during the close pass of Voyager 1 in November 1980. The atmospheric temperature decreases from its surface value of 94 K at a pressure of 1500 mbar to a minimum of 71 K at a height of 42 km and a pressure of 128 mbar. Details of atmospheric composition and thermal structure are discussed, taking into account chemical identifications and abundances, the vertical temperature structure, the horizontal temperature and opacity structure, and the radiative equilibrium. The upper atmosphere composition and temperature is considered along with the properties of aerosols, and meteorology and atmospheric dynamics. Titan's interior has an average density of 1.88 g per cu cm. Attention is given to Titan's surface and interior, and its formation.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

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