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  • 1
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    Planetary radio astronomy observations from voyager 2 near jupiter (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-23
    Description: The Voyager 2 Planetary Radio Astronomy experiment to Jupiter has confirmed and extended to higher zenomagnetic latitudes results from the identical experiment carried by Voyager 1. The kilometric emissions discovered by Voyager 1 often extended to 1 megahertz or higher on Voyager 2 and often consisted of negatively or, less frequently, positively drifting narrowband bursts. On the basis of tentative identification of plasma wave emissions similar to those detected by Voyager 1, the plasma torus associated with Io appeared somewhat denser to Voyager 2 than it did to Voyager 1. We report here on quasiperiodic sinusoidal or impulsive bursts in the broadcast band range of wavelengths (800 to 1800 kilohertz). A Faraday effect appears at decametric frequencies, which probably results from propagation of the radiation near its sources on Jupiter. Finally, we discuss the occurrence of decametric emission in homologous arc families.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pearce, J B -- Riddle, A C -- Warwick, J W -- Alexander, J K -- Desch, M D -- Kaiser, M L -- Thieman, J R -- Carr, T D -- Gulkis, S -- Boischot, A -- Leblanc, Y -- Pedersen, B M -- Staelin, D H -- New York, N.Y. -- Science. 1979 Nov 23;206(4421):991-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17733921" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Planetary radio astronomy observations from voyager 1 near saturn (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-04-10
    Description: The Voyager 1 planetary radio astronomy experiment detected two distinct kinds of radio emissions from Saturn. The first, Saturn kilometric radiation, is strongly polarized, bursty, tightly correlated with Saturn's rotation, and exhibits complex dynamic spectral features somewhat reminiscent of those in Jupiter's radio emission. It appears in radio frequencies below about 1.2 megahertz. The second kind of radio emission, Saturn electrostatic discharge, is unpolarized, extremely impulsive, loosely correlated with Saturn's rotation, and very broadband, appearing throughout the observing range of the experiment (20.4 kilohertz to 40.2 megahertz). Its sources appear to lie in the planetary rings.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warwick, J W -- Pearce, J B -- Evans, D R -- Carr, T D -- Schauble, J J -- Alexander, J K -- Kaiser, M L -- Desch, M D -- Pedersen, M -- Lecacheux, A -- Daigne, G -- Boischot, A -- Barrow, C H -- New York, N.Y. -- Science. 1981 Apr 10;212(4491):239-43.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783837" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Planetary radio astronomy observations from voyager 2 near saturn (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-01-29
    Description: Planetary radio astronomy measurements obtained by Voyager 2 near Saturn have added further evidence that Saturnian kilometric radiation is emitted by a strong dayside source at auroral latitudes in the northern hemisphere and by a weaker source at complementary latitudes in the southern hemisphere. These emissions are variable because of Saturn's rotation and, on longer time scales, probably because of influences of the solar wind and Dione. The electrostatic discharge bursts first discovered by Voyager 1 and attributed to emissions from the B ring were again observed with the same broadband spectral properties and an episodic recurrence period of about 10 hours, but their occurrence frequency was only about 30 percent of that detected by Voyager 1. While crossing the ring plane at a distance of 2.88 Saturn radii, the spacecraft detected an intense noise event extending to above 1 megahertz and lasting about 150 seconds. The event is interpreted to be a consequence of the impact, vaporization, and ionization of charged, micrometer-size G ring particles distributed over a vertical thickness of about 1500 kilometers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warwick, J W -- Evans, D R -- Romig, J H -- Alexander, J K -- Desch, M D -- Kaiser, M L -- Aubier, M -- Leblanc, Y -- Lecacheux, A -- Pedersen, B M -- New York, N.Y. -- Science. 1982 Jan 29;215(4532):582-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17771282" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Voyager 1 planetary radio astronomy observations near jupiter (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-01
    Description: We report results from the first low-frequency radio receiver to be transported into the Jupiter magnetosphere. We obtained dramatic new information, both because Voyager was near or in Jupiter's radio emission sources and also because it was outside the relatively dense solar wind plasma of the inner solar system. Extensive radio spectral arcs, from above 30 to about 1 megahertz, occurred in patterns correlated with planetary longitude. A newly discovered kilometric wavelength radio source may relate to the plasma torus near Io's orbit. In situ wave resonances near closest approach define an electron density profile along the Voyager trajectory and form the basis for a map of the torus. Detailed studies are in progress and are out-lined briefly.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warwick, J W -- Pearce, J B -- Riddle, A C -- Alexander, J K -- Desch, M D -- Kaiser, M L -- Thieman, J R -- Carr, T D -- Gulkis, S -- Boischot, A -- Harvey, C C -- Pedersen, B M -- New York, N.Y. -- Science. 1979 Jun 1;204(4396):995-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17800438" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Voyager 2 radio observations of uranus (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-07-04
    Description: Within distances to Uranus of about 6 x 10(6) kilometers (inbound) and 35 x 10(6) kilometers (outbound), the planetary radio astronomy experiment aboard Voyager 2 detected a wide variety of radio emissions. The emission was modulated in a period of 17.24 +/- 0.01 hours, which is identified as the rotation period of Uranus' magnetic field. Of the two poles where the axis of the off-center magnetic dipole (measured by the magnetometer experiment aboard Voyager 2) meets the planetary surface, the one closer to dipole center is now located on the nightside of the planet. The radio emission generally had maximum power and bandwidth when this pole was tipped toward the spacecraft. When the spacecraft entered the nightside hemisphere, which contains the stronger surface magnetic pole, the bandwidth increased dramatically and thereafter remained large. Dynamically evolving radio events of various kinds embedded in these emissions suggest a Uranian magnetosphere rich in magnetohydrodynamic phenomena.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warwick, J W -- Evans, D R -- Romig, J H -- Sawyer, C B -- Desch, M D -- Kaiser, M L -- Alexander, J K -- Carr, T D -- Staelin, D H -- Gulkis, S -- Poynter, R L -- Aubier, M -- Boischot, A -- Leblanc, Y -- Lecacheux, A -- Pedersen, B M -- Zarka, P -- New York, N.Y. -- Science. 1986 Jul 4;233(4759):102-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17812898" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Electronic Resource
    Electronic Resource
    Spectrum of the Extra-galactic Background Radiation at Low Radio Frequencies (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 847-849 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] New low frequency measurements5 obtained using the Radio Astronomy Explorer satellite (RAE-1) have extended the frequency range over which the background spectrum may be studied by more than a decade. At frequencies below 1 MHz, the effect of free-free absorption by electrons in the interstellar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/228847a0
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  • 7
    Electronic Resource
    Electronic Resource
    Low-frequency plasma waves near Saturn (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 714-716 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE low-frequency plasma wave emissions presented here are reminiscent of emissions observed within the Earth's magnetosphere1 and more recently within the jovian magnetosphere2'3. Their most striking feature consists of intense spiky bursts, interpreted as local electrostatic upper hybrid ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/292714a0
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  • 8
    Electronic Resource
    Electronic Resource
    Type III radio bursts in the outer corona (1969)
    Springer
    Solar physics 8 (1969), S. 388-397 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Type III solar radio bursts observed from 3.0 to 0.45 MHz with the ATS-II satellite over the period April–October 1967 have been analyzed to derive two alternative models of active region streamers in the outer solar corona. Assuming that the bursts correspond to radiation near the electron plasma frequency, ‘pressure equilibrium’ arguments lead to streamer Model I in which the streamer electron temperature derived from collision damping time falls off much more rapidly than in the ‘average’ corona and the electron density is as much as 25 times the average coronal density at heights of 10 to 50 solar radii (R ⊙). In Model II the streamer electron temperature is assumed to equal the average coronal temperature, giving a density enhancement which decreases from a factor of 10 close to the Sun to less than a factor of two at large distances (〉 1/4 AU). When the burst frequency drift is interpreted as resulting from the outward motion of a disturbance that stimulates the radio emission, Model I gives a constant velocity of about 0.35c for the exciting disturbance as it moves to large distances, while with Model II, there is a decrease in the velocity to less than 0.2c beyond 10 R ⊙.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155385
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  • 9
    Electronic Resource
    Electronic Resource
    Physics of the Jovian and Saturnian magnetospheres: Highlights of a conference held at the applied physics laboratory, the Johns Hopkins University, October 22–24, 1981 (1983)
    Springer
    Space science reviews 35 (1983), S. 269-292 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182023
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  • 10
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    Above- and belowground linkages shape responses of mountain vegetation to climate change (2019)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2019
    Description: 〈p〉Upward shifts of mountain vegetation lag behind rates of climate warming, partly related to interconnected changes belowground. Here, we unravel above- and belowground linkages by drawing insights from short-term experimental manipulations and elevation gradient studies. Soils will likely gain carbon in early successional ecosystems, while losing carbon as forest expands upward, and the slow, high-elevation soil development will constrain warming-induced vegetation shifts. Current approaches fail to predict the pace of these changes and how much they will be modified by interactions among plants and soil biota. Integrating mountain soils and their biota into monitoring programs, combined with innovative comparative and experimental approaches, will be crucial to overcome the paucity of belowground data and to better understand mountain ecosystem dynamics and their feedbacks to climate.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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