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  • 1
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    Predawn enhancement of 6300-A emission observed near the plasmapause from the Isis-2 spacecraft. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Data from several Isis-2 spacecraft passes are described in which the 6300-A atomic oxygen red line photometer mapped intensity steps resembling the predawn enhancement. Comparison with the electron density measured at the spacecraft indicates a plasmapause influence on the 6300-A emission rate, in that the intensity varies roughly inversely with the electron density at 1400 km. A simple calculation demonstrates the idea that field line opacity differences for photoelectrons are significant across the plasmapause. The measured electron temperatures are inadequate to account for the 6300-A excitation, thus confirming that it must arise from another mechanism.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Aug. 1
    Format: text
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  • 2
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    An observation of polar auroral and airglow from the ISIS-II spacecraft. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: This is a preliminary but comprehensive report on coordinated data obtained with the ISIS-II spacecraft, fourth in the ISIS series, launched 1 April 1971, into a near circular 1400 km orbit. The capabilities of the ISIS-I spacecraft have been extended in a number of ways, including the global mapping of the 3914, 5577 and 6300 A emissions. Data obtained during a 30-min pass over the south pole depict the nightside oval and polar cap, as well as mid-latitude airglow effects; these data are described and discussed.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 21; May 1973
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  • 3
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    Topside optical view of the dayside cleft aurora (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Photometers on the ISIS-II spacecraft provide a view of the atomic oxygen 5577-A and 6300-A emissions and the N2(+) 3914-A emission detected as dayside aurora in the magnetospheric cleft region. The 6300-A emission forms a continuous and permanent band across the noon sector, at about 78 deg invariant latitude, with a defined region of maximum intensity that is never less than 2 kR (uncorrected for albedo) and is centered near magnetic noon. There are significant differences in the intensity patterns on either side of noon and their responses to geomagnetic activity. Discrete 3914-A auroral forms appear within this region at preferred locations that cannot be precisely specified but which tend to the poleward edge of the 6300-A emission in the evening and the equatorward edge in the morning, where the difference between the two emissions is greatest. It is concluded that the discrete auroras observed by all-sky cameras in the day sector follow the 6300-A emission through the cleft region, though a definite cleft boundary is not defined.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 24; Oct. 197
    Format: text
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  • 4
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    Deformation of the night side plasmasphere and ionosphere during the August 1972 geomagnetic storm (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Dec. 1
    Format: text
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  • 5
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    The SAR arc event observed during the December 1971 magnetic storm (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Observations from five separate experiments on the Isis 2 spacecraft are used to study the atmosphere/ionosphere during the magnetic storm of December 16-20, 1971. The data are most complete in the midlatitude region, permitting a study of the SAR arc (subauroral red arc) which developed during the night of December 17-18. Ion composition and temperature, electron temperature, electron-density height profiles from the spacecraft to the F region, and the intensity of the 6300-A oxygen emission are all presented for the region of interest. It is found that the H(+) concentration had sharp gradients near the SAR arc and that the plasma temperature was significantly enhanced over typical nighttime values, reaching nearly 7000 K at 1400 km on the field line which intersected the arc. A system of time-dependent equations for atmospheric/ionospheric composition and temperature is solved using boundary conditions which were selected so that the solutions are in agreement with the observations. From these solutions, an assessment is made of the influence of (1) the efflux of plasma from the ionosphere to the magnetosphere, (2) the decrease in O/N2 at the turbopause, (3) the increase in the loss coefficient as a result of an increase in the vibrational temperature of N2, and (4) the conduction of thermal energy into the ionosphere.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Dec. 1
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  • 6
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    WAMDII observation of an auroral atmosphere wave event (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Field tests of WAMDII (Wide Angle Michelson Doppler Imaging Interferometer) on February 23 to 24, 1984 in Saskatoon produced wind images of the aurora that show well defined wave structures in lambda 5577. Wavelengths and velocities of these structures suggest an acoustic-gravity wave interpretation, but their short duration warrants their being termed an event. The Dopplergrams are presented with emphasis on the interpretation of the waves and a discussion of possible sources.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center Thermosphere Dynamics Workshop, Volume 2; p 467
    Format: application/pdf
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  • 7
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    Characteristics of optical emissions and particle precipitation in polar cap arcs (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Auroral emission features at high geomagnetic latitudes are identified and characterized using simultaneous optical and particle data from the ISIS-2 satellite. Polar cap arcs are identified from two-dimensional geomagnetic transforms of the optical data along with precipitating electron data for the time at which the satellite is on the field line intersecting the arc. No precipitating protons were detected for any of the arc crossings. The precipitations particle characteristics include: (1) an electron energy spectrum with a peak in the range 350-750 eV superposed on a soft spectrum like that observed in polar rain; (2) a normally isotropic pitch angle dependence, with the exception that field-aligned fluxes are observed in association with an inverted 'v' event; and (3) an energy flux range of approximately 0.8-3 erg/(sq cm s). A possible explanation of the observed precipitating particle characteristics is that parallel electric fields are accelerating polar rain type spectra at an altitude of several thousand km.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 31; Feb. 198
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  • 8
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    An empirical determination of the production efficiency for auroral 6300-A emission by energetic electrons (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Auroral data from the soft particle spectrometer and the red line photometer on board the Isis satellite are presented as a data base for electron energy flux and optical auroral emission and are used to derive production efficiencies for 6300 A emission. Data obtained during a single orbit in which an aurora was observed is corrected by integrating the precipitating flux observed in four energy bands over the loss cone and eliminating the effects of airglow and albedo in the optical emission measurements. A regression analysis of the corrected data from 12 orbits is used to determine 6300 A production coefficients for the 5-60 eV, 60-300 eV, 0.3-1 keV and 1-15 keV electron energy bands. Production coefficients are shown to be in good agreement with theoretical calculations and rocket measurements in conjugate photoelectrons, and applications of the method to other data sets are discussed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 85; Feb. 1
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  • 9
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    An unusual SAR arc observed during ring current development, 4 August 1972 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An unusual SAR arc observed during the growth phase of the ring current is described. Proton precipitation was observed, with electron temperature enhancements throughout the region, and an F-region trough present at the equatorward boundary; a high flux of low energy at the SAR arc location and a 'slot' in the ambient electron density are characteristic of this event. Comparisons are made with S3-A spacecraft observations made in the equatorial region at the same time and with Isis-II observations of a more normal SAR arc; the kinetic Alfven process described by Hasegawa and Mima (1978) appears to account for the acceleration of these low energy electrons, although an auroral-type acceleration process cannot be excluded.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 28; Jan. 198
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  • 10
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    Coordinated ionospheric and magnetospheric observations from the ISIS 2 satellite by the ISIS 2 experimenters. Volume 2: Auroral optical emissions magnetic field perturbations, and plasma characteristics, measured simultaneously on the same magnetic field line (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The data set consists of a selected number of passes, each comprising a format combination that is most appropriate for the particular data set. A list of ISIS 2 experimenters, with addresses and telephone numbers is included. A brief description of the ISIS 2 satellite is given, followed by more detailed instrument descriptions, format descriptions, data set descriptions, and the data themselves.
    Keywords: GEOPHYSICS
    Type: NASA-TM-82283 , NSSDC/WDC-A-R/S-80-09
    Format: application/pdf
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