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  • SOLAR PHYSICS  (71)
  • SPACE SCIENCES  (32)
  • 1
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    Observation of local radio emission associated with type III radio bursts and Langmuir waves (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The first clear detection of fundamental and harmonic radiation from the type III radio source region is presented. This radiation is characterized by its lack of frequency drift, its short rise and decay times, its relative weakness compared to the remotely observed radiation and its temporal coincidence with observed Langmuir waves. The observations were made with the radio and plasma frequency (URAP) receivers on the Ulysses spacecraft between about 1 and 2 AU from the Sun.
    Keywords: SOLAR PHYSICS
    Type: In: Solar Wind Seven; Proceedings of the 3rd COSPAR Colloquium, Goslar, Germany, Sept. 16-20, 1991 (A93-33554 13-92); p. 657-662.
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  • 2
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    Long-wavelength radio astronomy of the galaxy (1969)
    In:  CASI
    Details
    Publication Date: 2005-11-17
    Description: Long-wavelength radio astronomy from Explorer 38 satellite with spatial distribution
    Keywords: SPACE SCIENCES
    Type: NIFICANT ACCOMPLISHMENTS IN SCI., 1968 1969; P 165-168
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  • 3
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    Observation of non-drifting radio emissions associated with the intense solar activity in March 1991 (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Three very unusual radio bursts, separated in time by 4 hours and 35 minute-intervals were observed on March 28, 1991 by the radio and plasma wave (URAP) experiment on the Ulysses spacecraft. Although they are preceded by drifting type III bursts at high frequencies, they show no frequency drift at frequencies from 52 kHz down to 16 kHz. In addition, they have extraordinary sawtooth-like profiles; they have a very rapid exponential rise of about 20 minutes independent of frequency and a much longer nonexponential decay which increases with decreasing frequency. The bursts are interpreted as due to synchrotron emission, which seems to fit many of their characteristics. This radio emission appears to be associated with an expanding source region. However, the observed intensity may be somewhat higher than expected and the possible role of the precursor type III radio bursts in triggering the low frequency non-drifting remains unanswered.
    Keywords: SOLAR PHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 19; 12, J
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  • 4
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    Unusual radio and plasma wave phenomena observed in March 1991 (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: During the intense solar flare activity in March 1991 a number of unusual radio emission and Langmuir wave phenomena were observed by the radio and plasma wave (URAP) experiment on the Ulysses spacecraft. These phenomena were associated with unusual conditions in the interplanetary medium (IPM) presumably resulting from intense solar activity. Some of these URAP observations cannot be explained by mechanisms usually attributed to interplanetary (IP) radio emissions and Langmuir wave activity and require other interpretations.
    Keywords: SOLAR PHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 19; 12, J
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  • 5
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    Evidence for halo-like radio sources from kilometric type III burst observations (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The radio azimuths for many kilometric type III bursts that originate near or behind the limb of the sun are observed to drift far to the east or far to the west of the spacecraft-sun line. It is shown that the behavior of the observed burst parameters for these events corresponds to the response of a spinning dipole antenna to halolike sources of radiation around the sun. These results provide evidence for a previous suggestion that behind-the-limb type III events should appear as halolike sources of radiation to an observer on the opposite side of the sun, due to scattering of the radiation from the primary source back around the sun.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 125; 371-388
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  • 6
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    Multispacecraft observations of solar (He-3)-rich events (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A systematic search of He isotope observations on the Helios 1 and 2 spacecraft during the occurrence of 66 (He-3)-rich time periods observed on ISEE 3 over a 4-yr interval is reported. Seven time-periods show possible event associations but only three show confirmed events with similar He-3/He-4 ratios on Helios and ISEE 3. Kilometric radio observations of type III bursts produced by electrons associated with the (He-3)-rich events are used to map the interplanetary field lines outward from the events. The observations are best explained in terms of a narrow cone of emission of the particles from these events.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 380; 287-292
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  • 7
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    Comparisons of interplanetary type III storm footpoints with solar features (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The trajectories of 38 type III storms in the interplanetary medium have been deduced from ISEE-3 radio observations and extrapolated back to the sun to determine the Carrington coordinates of their footpoints. The analysis assumes radial motion of the solar wind, and the trajectories are projected radially back toward the surface for the last few solar radii. To identify the storm sources, the footpoints were compared to a variety of solar features: to the large-scale neutral line at the base of the current sheet, to active regions, to the small-scale neutral lines and H-alpha filaments which trace out active regions, and to coronal holes. Most of the footpoints were found to lie near active regions, in agreement with metric storm locations. There is a weak correlation with H-alpha filaments, no apparent association with the current sheet, and an anticorrelation with coronal holes. There is a small excess of storms in the leading half of magnetic sectors.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 109; 1, 19
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  • 8
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    The identification of solar He-3-rich events and the study of particle acceleration at the sun (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Kilometric radio observations are to associate type III radio bursts with solar He-3-rich events and to identify and study the sources of those events at the sun and the transport of the particles outward toward earth. The events exhibit an impulsive behavior that earns them a natural role in the event classification scheme based upon the time scale of the particle acceleration process. Multiple He-3-rich events are observed frequently from a single active region where they provide a convenient signature to test theories of particle storage and transport. These multiple events act as impulsive probes of the condition of the interplanetary medium. Their profiles contrast with the source-acceleration-induced profiles of the long-duration events from the same active region that are interspersed among them.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 308; 902-911
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  • 9
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    Model interpretation of type III radio burst characteristics. II - Temporal aspects (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A model of the radio emission region for kilometric type II bursts is used to interpret systematic variations observed in the temporal behavior of the burst parameters. The temporal behavior of the burst parameters observed by the ISEE-3 spacecraft is reviewed, and it is pointed out that the phase and modulation of the antenna signal vary in a systematic way with both time and observing frequency. The source azimuth is observed to drift with time, with the magnitude and sense of the drift depending on the location of the radio source relative to the observer. The modulation factor usually decreases uniformly with time and is frequently peaked near the burst onset. The model of the radio emission region is developed and used to obtain the intensity, phase, and modulation of the radio signal. Model results are used to show how the behavior of the burst parameters are related to attributes of the source region. It is shown that the temporal behavior of the radio parameters for an observed type II burst is well represented by the model.
    Keywords: SOLAR PHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 217; 1-2,
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  • 10
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    Characteristics of interplanetary type II radio emission and the relationship to shock and plasma properties (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A large sample of type II events is the basis of the present study of the properties of interplanetary type II bursts' radio-emission properties. Type II spectra seem to be composed of fundamental and harmonic components of plasma emission, where the intensity of the fundamental component increases relative to the harmonic as the burst evolves with heliocentric distance; burst average flux density increases as a power of the associated shock's average velocity. Solar wind density structures may have a significant influence on type II bandwidths.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 159-167
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