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  • GEOPHYSICS  (13)
  • SPACECRAFT INSTRUMENTATION  (3)
  • SPACECRAFT PROPULSION AND POWER  (1)
  • 1
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    Report from magnetospheric science (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: By the early 1990s, magnetospheric physics will have progressed primarily through observations made from Explorer-class spacecraft, sounding rockets, ground based facilities, and shuttle based experiments. The global geospace science (GGS) element of the International Solar Terrestrial Physics program, when combined with contributions to the ESA Cluster mission and ground based and computer modeling programs, will form the basis for a major U.S. initiative in magnetospheric physics. The scientific objectives of the GGS program involve the study of energy transport throughout geospace. The Cluster mission will investigate turbulence and boundary phenomena in geospace, particularly at high latitudes on the dayside and in the region of the neutral sheet at geocentric distances of about 20 earth radii on the night side of the earth. The current state of knowledge is reviewed and the goals of these missions are briefly discussed.
    Keywords: GEOPHYSICS
    Type: Solar-Terrestrial Science Strategy Workshop; p 25-30
    Format: application/pdf
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  • 2
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    Waves In Space Plasmas (WISP) (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Waves in space plasmas (WISP) utilizes powerful radio transmitters and sensitive receivers to probe the secrets of the magnetosphere, ionosphere and atmosphere. The scientific objective is to achieve a better understanding of the physical processes occurring in these regions. For example, audio frequency radio waves will be radiated from the long WISP antenna, will travel to the outer reaches of the magnetosphere, and will interact with Van Allen belt particles, releasing some of their energy which amplifies the waves. Study of this interaction will give a better understanding of a major magnetospheric process, wave-particle interactions. Radio waves from WISP at higher frequencies (AM radio and beyond) will be reflected by the ionosphere and will, for example, advance our understanding of bubbles in the equatorial ionosphere which affect satellite communications.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: NASA. George C. Marshall Space Flight Center Solar Terrestrial Observatory Space Station Workshop Report; p 8-9
    Format: application/pdf
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  • 3
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    Waves In Space Plasmas (WISP) (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Waves in space plasmas (WISP) utilizes powerful radio transmitters and sensitive receivers to probe the secrets of the magnetosphere, ionosphere and atmosphere. The scientific objective is to achieve a better understanding of the physical processes occurring in these regions. For example, audio frequency radio waves will be radiated from the long WISP antenna, will travel to the outer reaches of the magnetosphere, and will interact with Van Allen belt particles, releasing some of their energy which amplifies the waves. Study of this interaction will give us a better understanding of a major magnetospheric process, wave particle interactions. Radio waves from WISP at higher frequencies (AM radio and beyond) will be reflected by the ionosphere and will, for example, advance our understanding of bubbles in the equatorial ionosphere which affect satellite communications.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Alabama Univ. Coordinated Study of Solar-Terrestrial Payloads on Space Station; 2 p
    Format: application/pdf
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  • 4
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    Space experiments with particle accelerators (SEPAC): Description of instrumentation (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: SEPAC (Space Experiments with Particle Accelerators) flew on Spacelab 1 (SL 1) in November and December 1983. SEPAC is a joint U.S.-Japan investigation of the interaction of electron, plasma, and neutral beams with the ionosphere, atmosphere and magnetosphere. It is scheduled to fly again on Atlas 1 in August 1990. On SL 1, SEPAC used an electron accelerator, a plasma accelerator, and neutral gas source as active elements and an array of diagnostics to investigate the interactions. For Atlas 1, the plasma accelerator will be replaced by a plasma contactor and charge collection devices to improve vehicle charging meutralization. This paper describes the SEPAC instrumentation in detail for the SL 1 and Atlas 1 flights and includes a bibliography of SEPAC papers.
    Keywords: GEOPHYSICS
    Type: NASA-TM-89728 , NAS 1.15:89728
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  • 5
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    Rocket observations at the northern edge of the eastward electrojet (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper discusses a Nike-Tomahawk rocket launched north over quiet, late evening auroral arcs in March 1975. A northward magnetic disturbance was observed on the ground under the rocket trajectory; south of the arcs the northward electric field was 60 mV/m, indicating strong westward plasma flow. An eastward electrojet current layer was penetrated in the upward flight, and precipitating electrons were observed over each arc. Using the observed electron flux and a model of the ionosphere, the Hall and Pedersen conductivities were calculated which were used to compute the eastward and northward components of the horizontal ionospheric currents. The joule power decreased abruptly in the auroral arcs, as the precipitating electron power increased; the total dissipated power was the same inside the arcs, between them and southward. North of the aurora the electric field and dissipated power remained low; field-aligned currents carried by the observed electrons were about a factor of 3 lower than those inferred from the magnetic field measurements.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 85; July 1
    Format: text
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  • 6
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    Plasmaspheric hiss observations in the evening and afternoon quadrants (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data obtained with an Explorer-45 instrument for detecting the magnetic components of ELF signals propagating in the magnetosphere are examined, showing that the strongest, most persistent signals were plasmaspheric hiss from a few hundred to a few thousand Hertz. Broad-band signals of 25 milligamma were common. The most intense hiss was observed in the recovery phase of magnetic storms at the inner edge of the ring current. Its source appears to be the outer plasmasphere. Most of the hiss is attributed to generation of hiss through cyclotron resonance with energetic electrons. Ring current protons, forming a peak in the proton flux between 10 and 100 keV, may be a source of some of the hiss.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; June 1
    Format: text
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  • 7
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    The Pioneer Venus Orbiter plasma wave investigation (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Pioneer Venus plasma wave instrument has a self-contained balanced electric dipole (effective length = 0.75 m) and a 4-channel spectrum analyzer (30% bandwidth filters with center frequencies at 100 Hz, 730 Hz, and 30 kHz). The channels are continuously active and the highest Orbiter telemetry rate (2048 bits/sec) yields 4 spectral scans/sec. The total mass of 0.55 kg includes the electronics, the antenna, and the antenna deployment mechanism. This report contains a brief description of the instrument design and a discussion of the in-flight performance.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience and Remote Sensing; GE-18; Jan. 198
    Format: text
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  • 8
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    Explorer 45 observations of 1- to 30-Hz magnetic fields near the plasmapause during magnetic storms (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Apr. 1
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  • 9
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    Morphology of VLF emissions observed with the Injun 3 satellite. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: VLF emission morphology from Injun 3 satellite observation
    Keywords: GEOPHYSICS
    Type: ; UGREVUE(
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  • 10
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    A test of incoherent Cerenkov radiation for VLF hiss and other magnetospheric emissions (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Consideration of incoherent Cerenkov radiation from intense fluxes of electrons in the magnetosphere as a source of VLF hiss and several other emission phenomena. A procedure for calculating the Cerenkov and cyclotron radiation power from a spectrum of electrons in a test volume is outlined, as well as a ray-tracing routine for determining the path that the emitted power follows through the magnetosphere. Comparisons are made between a VLF hiss event and an energetic particle spectrum observed simultaneously with the Injun 5 spacecraft. Calculated power and fields for incoherent Cerenkov radiation are two orders of magnitude below the observed VLf hiss values, although the spectral shapes are similar. It is concluded that a partially coherent or amplified Cerenkov source or an instability is located in the altitude range from 3000 to 10,000 km. Calculations regarding Cerenkov radiation as a possible source for other wave phenomena indicate that upper hybrid resonance noise and fast hisslers may be understood in terms of incoherent Cerenkov radiation, but that V-shaped VLF hiss, saucers, ELF hiss, and Io-related Jovian decametric radiation may not.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Jan. 1
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