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  • 1
    Electronic Resource
    Electronic Resource
    A Relation Between Solar Radio Emission and Polar Cap Absorption of Cosmic Noise (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 610-613 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IONOSPHERIC absorption of cosmic noise in polar regions (called polar cap absorption) is believed to be caused by ionization of the upper atmosphere by fast protons (in the energy-range of 10-50 MeV.) emitted from the Sun after a big flare1 2. Direct balloon observations of protons have confirmed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186610a0
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  • 2
    Electronic Resource
    Electronic Resource
    Observations at 6 cm of the solar active region (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 465-467 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The WSRT consists of twelve 25 m paraboloids along an east-west baseline, combined to form 20 interferometers. For our observations the minimum spacing was 90 m, the maximum 1,458m, the separation between successive baselines was 72 m and the integration time was 30 s. At the wavelength of 6 cm and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/257465a0
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  • 3
    Electronic Resource
    Electronic Resource
    Lunar Occupation of a Solar Active Region at 4 cm Wavelength (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 1132-1133 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. The curves of immersion and emersion of the eclipse of July 20, 1963. The radiometer intensity is in arbitrary units. Both analogue and digital records at intervals of 4 s were taken. The occultation curves for immersion and emersion are shown in Fig. 1. From the calculated positions of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2171132a0
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  • 4
    Electronic Resource
    Electronic Resource
    Occultation of Taurus- A by the Solar Corona at 430 Mc/s in June 1964 (1965)
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 683-684 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The 1,000-ft. dish has a half-power pencil beam of 9'.5 arc at 430 Mc/s, and because of its large collecting area it is particularly suitable for studying the variation of intensity of Taurus-A, as its radiation passes through different regions of the corona. However, the beam has undesirable side ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/205683a0
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  • 5
    Electronic Resource
    Electronic Resource
    Time Relationship of Metre-Wave and 3-cm. Wave Bursts (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1047-1048 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For this study, the data on metre-wave bursts (200 Mc./s.) provided by the observatory of era in Holland have been used. For those 3-cm. wave bursts which are accompanied by precursors, the time of beginning of the precursor has been taken as the time of beginning of the burst. Fig. la shows the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831047b0
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  • 6
    Electronic Resource
    Electronic Resource
    A type IV burst associated with a coronal streamer disruption event (1987)
    Springer
    Solar physics 111 (1987), S. 53-57 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A type IV burst was observed on February 17, 1985 with the Clark Lake Radio Observatory multifrequency radioheliograph operating in the frequency range 20–125 MHz. This burst was associated with a coronal streamer disruption event. From two-dimensional images produced at 50 MHz, we show evidence of a type II burst and a slow moving type IV burst. The observations of the moving type IV burst suggests that a plasmoid containing energetic electrons can result from the disruption of a coronal streamer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145440
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  • 7
    Electronic Resource
    Electronic Resource
    An eruptive prominence and associated cm-mm emission outside the solar limb (1988)
    Springer
    Solar physics 116 (1988), S. 83-89 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present radio maps at 22 and 44 GHz which show the emission before and after the eruption of a quiescent prominence located at the west limb. The observed radiation following the eruption is not consistent with thermal bremsstrahlung mechanism. It can be interpreted as due to gyrosynchrotron emission of nonthermal electrons. Our observations appear to be similar to the microwave radiation observed in post-flare loops; this radiation is due to nonthermal electrons trapped in the closed magnetic structures formed after the prominence eruption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171716
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  • 8
    Electronic Resource
    Electronic Resource
    A study of coronal bright points at 20 cm wavelength (1988)
    Springer
    Solar physics 117 (1988), S. 37-50 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the results of a study of coronal bright points observed at 20 cm with the VLA on a day when the Sun was exceptionally quiet. Microwave maps of bright points were obtained using data for the entire observing period of 5 hours, as well as for shorter periods of a few minutes. Most bright points, especially those appearing in the full-period maps appear to be associated with small bipolar structures on the photospheric magnetogram. Overlays of bright point (B.P.) maps on the Ca+K picture, show that the brightest part of a B.P. tends to lie on the boundary of a supergranulation network. In general, the bright points exhibit rapid variations in intensity. There is no systematic correlation between the size of a B.P. and its intensity; the apparently slow variation of B.P. emission may have rapid fluctuations superimposed on it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148570
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  • 9
    Electronic Resource
    Electronic Resource
    Meterwave observations of a coronal hole (1987)
    Springer
    Solar physics 111 (1987), S. 419-428 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present meterwave maps showing a coronal hole at 30.9, 50.0, and 73.8 MHz using the Clark Lake Radioheliograph in October 1984. The coronal hole seen against the disk at all three frequencies shows interesting similarities to, and significant differences from its optical signatures in He i λl10830 spectroheliograms. Using the model of coronal holes by Dulk et al. (1977) we derive the electron density from the radio observations of the brightness temperature. The discrepancy between the density value derived from the Skylab EUV data and that computed from our radio data is even larger than in Dulk et al. 's comparison at similar and higher frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148529
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  • 10
    Electronic Resource
    Electronic Resource
    Correlated type III burst emission from distant sources on the Sun (1987)
    Springer
    Solar physics 112 (1987), S. 133-142 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the observation and interpretation of a correlated type III burst emitted from distant sources on the Sun. The angular separation between the distant sources is as large as 26′ or ∼ 106 km. There was an active region ∼ 30° behind the limb, and it is believed that the type III burst emission originated from activity in this region. The implications of the locations of the correlated sources with regard to the geometry of the magnetic structures involved in the flare process are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148493
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