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  • SOLAR PHYSICS  (42)
  • Space Radiation  (2)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • 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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    Comparison of interplanetary type 2 radio burst observations by ISEE-3, Ulysses, and WIND with applications to space weather prediction (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Interplanetary (IP) type 2 radio bursts are produced by IP shocks driven by solar ejecta, presumably involving shock acceleration of electrons that leads to radio emission. These radio bursts, which can be detected remotely by a sensitive spacecraft radio receiver, provide a method of tracking the leading edge of solar ejecta moving outward from the sun. Consequently, observations of these bursts sometimes provide advance warning of one or more days prior to the onset of geomagnetic activity induced by the solar ejecta. A robust lower limit on the fraction of intense geomagnetic storms, that are preceded by IP type 2 bursts, is provided. It is shown that 41 percent of the geomagnetic storms occurring during the interval September 1978 to February 1983 were preceded by type 2 events in this catalog, and reasons why the fraction is not larger are addressed. Differences in the observing capabilities of the International Sun-Earth Explorer (ISEE) 3, Ulysses, and WIND, to explain why each of these similar spacecraft radio investigations provides a different perspective of IP type 2 emissions are reviewed.
    Keywords: Space Radiation
    Type: Proceedings of the 31st ESALB Symposium on Correlated Phenomena at the Sun, in the Heliosphere and in Geospace; 533-538; ESA-SP-415
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  • 3
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    Ulysses and WIND simultaneous observations of the radio emission associated with the 6-7 January 1997 coronal mass ejection (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The three dimensional source location of interplanetary type 2 radio bursts is intended to be determined from two spacecraft observations, performed by the radio receivers onboard the WIND and Ulysses spacecraft and associated with the interplanetary coronal mass ejection detected by the large advanced spectrometer coronagraph (LASCO) from the SOHO spacecraft. The intensity time profiles recorded by WIND and Ulysses were compared and their directivity is found to vary from one component of radio emission to another. The three dimensional location was obtained by radio triangulation and was deduced from the direction measured at WIND and the difference of the arrival times measured at both spacecraft. The sensitivity of both determination methods to wave scattering and refraction was discussed.
    Keywords: Space Radiation
    Type: Proceedings of the 31st ESALB Symposium on Correlated Phenomena at the Sun, in the Heliosphere and in Geospace; 429-430; ESA-SP-415
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  • 4
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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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  • 5
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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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  • 6
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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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  • 7
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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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  • 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
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    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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