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  • Artikel  (460)
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  • 11
    Digitale Medien
    Digitale Medien
    Direction finding measurements of type III bursts in both elevation and azimuth (1976)
    Springer
    Solar physics 46 (1976), S. 475-475 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Direction finding measurements with the plasma wave experiments on the HAWKEYE 1 and IMP-8 satellites are used to find the source locations of type III solar radio bursts in elevation (geocentric solar ecliptic latitude) and azimuth (geocentric solar ecliptic longitude) in a frequency range from 31.1 kHz to 500 kHz. IMP-8 has its spin axis perpendicular to the ecliptic plane, hence by analyzing the spin modulation of the signals the location of the type III burst projected into the ecliptic can be found. HAWKEYE 1 has its spin axis nearly parallel to the ecliptic plane, hence the elevation of the source may also be determined. The trajectory of the electrons generating the burst, projected onto the ecliptic plane, follows an Archimedean spiral. Out of the ecliptic plane the trajectory is at a nearly constant heliographic latitude. The electrons originate from a region near a solar flare. With direction measurements of elevation and azimuth along with the modulation factor it is possible to determine the source size. Typical half angle source sizes range from ∼60° at 500 kHz to ∼40° at 56.2 kHz as viewed from the sun.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00149871
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  • 12
    Digitale Medien
    Digitale Medien
    The great solar storms of 1989 (1991)
    [s.l.] : Nature Publishing Group
    Nature 353 (1991), S. 705-706 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A SERIES of exceptional solar flares in March 1989, widely reported at the time, had extensive effects on the Earth's ionosphere according to three papers1"3 in the Journal of Geophysical Research. These effects included the rapid upwards drift of plasma, the strong depletion of ionospheric density ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/353705a0
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  • 13
    Digitale Medien
    Digitale Medien
    Detection of a radio emission at 3 kHz in the outer heliosphere (1984)
    [s.l.] : Nature Publishing Group
    Nature 312 (1984), S. 27-31 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A radio source in the outer heliosphere has been detected by the plasma wave receivers on Voyagers 1 and 2. The radio emission is observed in the frequency range 2–3 kHz, and is above the local solar wind electron plasma frequency whenever supporting plasma density data are available. The ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/312027a0
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  • 14
    Digitale Medien
    Digitale Medien
    Heliosphere in a bottle (1994)
    [s.l.] : Nature Publishing Group
    Nature 368 (1994), S. 585-585 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] WITH Pioneers 10 and 11 and Voyagers 1 and 2 now forming a veritable fleet of heliospheric probes, interest in the outermost reaches of the Sun's influence is mounting. When can we expect them to reach the regions where the solar wind's influence gives way to that of the local interstellar medium, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/368585a0
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  • 15
    Digitale Medien
    Digitale Medien
    Narrowband electromagnetic emissions from Jupiter's magnetosphere (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 385-388 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Recent studies of wideband plasma wave data from Voyagers 1 and 2 have revealed the existence of narrowband radio emissions escaping from Jupiter's magnetosphere in the frequency range 1–12 kHz. These narrowband emissions are very similar to narrowband emissions previously discovered ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/302385a0
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  • 16
    Digitale Medien
    Digitale Medien
    Tweaking the magnetosphere (1992)
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 18-19 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE dramatic effects of magnetic storms above the Earth's neutral atmosphere have been highlighted several times during the recent maximum in the cycle of solar activity1. But although the loose association between solar activity and the terrestrial storms has long been made, the details of cause ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/356018a0
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  • 17
    Digitale Medien
    Digitale Medien
    Narrowband electromagnetic emissions from Saturn's magnetosphere (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 733-737 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] During the Saturn flyby the Voyager 1 plasma wave instrument observed a series of narrowband electromagnetic emissions at frequencies between 3 and 30 kHz (ref. 1). These bands are remarkable because of their extremely complex spectral structure, consisting of a large number of nearly monochromatic ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/292733a0
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  • 18
    Digitale Medien
    Digitale Medien
    Jupiter tail phenomena upstream from Saturn (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 585-586 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Voyager 2 plasma wave and plasma probe measurements from February 1981 suggest that phenomena associated with a well defined tail of Jupiter have been detected at a distance of about 6,200 RJ. This indicates that Saturn's magnetosphere will be affected by the jovian tail and that by ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/292585a0
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  • 19
    Digitale Medien
    Digitale Medien
    Solar wind dynamic pressure and electric field as the main factors controlling Saturn's aurorae (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 433 (2005), S. 720-722 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The interaction of the solar wind with Earth's magnetosphere gives rise to the bright polar aurorae and to geomagnetic storms, but the relation between the solar wind and the dynamics of the outer planets' magnetospheres is poorly understood. Jupiter's magnetospheric dynamics ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/nature03333
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  • 20
    Digitale Medien
    Digitale Medien
    Radio emissions from the outer heliosphere (1996)
    Springer
    Space science reviews 78 (1996), S. 53-66 
    Details
    ISSN: 1572-9672
    Schlagwort(e): Heliospheric Radio Emissions ; Heliosphere ; Heliopause ; Termination Shock
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract For nearly fifteen years the Voyager 1 and 2 spacecraft have been detecting an unusual radio emission in the outer heliosphere in the frequency range from about 2 to 3 kHz, Two major events have been observed, the first in 1983–84 and the second in 1992–93. In both cases the onset of the radio emission occurred about 400 days after a period of intense solar activity, the first in mid-July 1982, and the second in May–June 1991. These two periods of solar activity produced the two deepest cosmic ray Forbush decreases ever observed. Forbush decreases are indicative of a system of strong shocks and associated disturbances propagating outward through the heliosphere. The radio emission is believed to have been produced when this system of shocks and disturbances interacted with one of the outer boundaries of the heliosphere, most likely in the vicinity of the the heliopause. The emission is believed to be generated by the shock-driven Langmuir-wave mode conversion mechanism, which produces radiation at the plasma frequency (f p ) and at twice the plasma frequency (2f p ). From the 400-day travel time and the known speed of the shocks, the distance to the interaction region can be computed, and is estimated to be in the range from about 110 to 160 AU.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00170792
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