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  • 1
    Electronic Resource
    Electronic Resource
    Absorption of 3.5-m. Radiation in the Optical Emission Nebula, NGC 6357 (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 178-178 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Tracings of records obtained at five declinations superimposed to display the absorption effect at the position of NGCSZbl. Declinations: (a) - 35 11'; (b) - 34 51'; (o) - 34 31' ; (d) - 34 11'; (e) - 33 51' The radio telescope has a pencil-beam response, 50' between half-power points, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/177178a0
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  • 2
    Electronic Resource
    Electronic Resource
    Radio evidence of twisted bi-polar magnetic fields in the solar corona (1972)
    Springer
    Solar physics 26 (1972), S. 176-182 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of bi-polar type I storm centers with the Culgoora radioheliograph operating at 80 MHz show that in many cases they are not oriented as we should expect for emission in the ordinary mode and for the simplest magnetic field geometry. We interpret this as evidence for a twist in the magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155118
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  • 3
    Electronic Resource
    Electronic Resource
    White light and radio studies of the coronal transient of 14–15 September 1973 (1976)
    Springer
    Solar physics 49 (1976), S. 369-394 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of a coronal transient event were obtained in white light by the Skylab coronagraph and at metric wavelengths by the radioheliograph and spectrograph at Culgoora and the spectrograph-interferometer at Boulder. The continuum radio burst was found to originate above the outward-moving white light loop - a region of compressed material headed by a bow wave. The computed density in the region of radio emission, based on either gyro-synchrotron or harmonic plasma radiation mechanisms, was approximately 10 times the ambient coronal density; this is compatible with the density deduced from the white light observations. The magnetic energy density derived from the radio observations was greater than 10 times the thermal energy density, marginally larger than the kinetic energy density in the fastest moving portion of the transient, and considerably larger in most other regions. The ambient medium, the white light front, the compression region, the loop, and the slower, massive flow of material behind are each examined. It is found that the plasma was magnetically controlled throughout, and that magnetic forces provided the principal mechanism for acceleration of the transient material from the Sun.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162459
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  • 4
    Electronic Resource
    Electronic Resource
    Preliminary observations of solar radio sources with the Culgoora radioheliograph operating at four frequencies (1983)
    Springer
    Solar physics 83 (1983), S. 167-177 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Culgoora radioheliograph has been modified for observing at 327.4 MHz, which is in addition to the three frequencies (43.25, 80, and 160 MHz) previously available. At the new frequency the array beamwidth is 56″, which represents the highest resolution yet available for metre-wavelength solar mapping. At 327.4 MHz the sources of radio emission are mainly in the lowest layers of the corona. Some preliminary four-frequency observations have been made of type I storms. It is found that the source size generally decreases with increasing observing frequency. This result confirms earlier suggestions that the sources of both type I and type III emission are contained in structures whose boundaries diverge outwards in the corona.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148251
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  • 5
    Electronic Resource
    Electronic Resource
    Radio and EUV observations of a coronal hole (1977)
    Springer
    Solar physics 52 (1977), S. 349-367 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present observations of a coronal hole made with the EUV spectroheliometer of the Harvard College aboard Skylab and with ‘high resolution’ (2–4′) radio telescopes at Culgoora and Fleurs Australia and Bonn, West Germany. We attempt to derive the density and temperature distributions in the transition region and inner corona from the combined observations. No one ‘standard’ model can explain both sets of observations; characteristically, models based on EUV data yield higher radio brightnesses than are observed, while models based on radio data yield lower EUV line intensities than are observed. The discrepancy is essentially that the electron density inferred from the EUV data is about three times that inferred from the radio data. After examining several possible modifications of the standard models we suggest that the discrepancy would disappear if the abundances of the heavier elements were increased by about a factor of 10. Such increases could result from differential diffusion in the large temperature gradient of the transition region. We conclude therefore that models which incorporate thermal diffusion, as well as mass outflow and departures from ionization equilibrium, offer the greatest hope of reconciling the EUV and radio observations of coronal holes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149652
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  • 6
    Electronic Resource
    Electronic Resource
    Coronal magnetic field structure derived from two-frequency radioheliograph observations (1974)
    Springer
    Solar physics 35 (1974), S. 181-192 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An exceptional variety of positions and polarizations was found for two type I storms and numerous sporadic bursts observed during 15 consecutive days with the Culgoora radioheliograph at 80 and 160 MHz. The radio data are combined with optical data to derive a model of the coronal magnetic field structure for a complex of active regions; in this model the type I sources are located on multiple strong-field loops, and the sources of the sporadic bursts on widely diverging weak-field arches. It is also shown that this model can explain the seemingly erratic placement of the storm sources and the appearance of the sporadic sources round a large arc. The observed positions and polarizations support, rather convincingly, the hypothesis that type I and type III radiations are of the ordinary magnetoionic mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156966
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  • 7
    Electronic Resource
    Electronic Resource
    Regular Pulses from the Sun and a Possible Clue to the Origin of Solar Cosmic Rays (1971)
    [s.l.] : Nature Publishing Group
    Nature 234 (1971), S. 140-142 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our work was stimulated by an extraordinary pulsating event recorded with the Culgoora radiospectrograph on September 27, 1969 (Fig. 1). A remarkably regular series of about 50 sharp pulses were received in the frequency range 100 to 200 MHz, each pulse occurring almost simultaneously throughout ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/234140a0
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  • 8
    Electronic Resource
    Electronic Resource
    80 MHz Photography of the Eruption of a Solar Prominence (1968)
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 536-539 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Photographs of the eruption of a solar prominence made in its radiation at 80 MHz by the Culgoora radioheliograph reveal relationships between the prominence, a flare and solar radio ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/218536a0
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  • 9
    Electronic Resource
    Electronic Resource
    The structure of the middle corona from observations at 80 and 160 MHz (1974)
    Springer
    Solar physics 36 (1974), S. 191-202 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Maps of the brightness distribution of the ‘quiet Sun’ at 80 and 160 MHz reveal the presence of features both brighter and darker than average. The ‘dark’ regions are well correlated with dark regions on UV maps; we deduce that they result from ‘coronal holes’. The ‘bright’ regions are associated with quiescent filaments and not plages or bright regions on microwave or UV maps; we deduce that they result from ‘coronal helmets’. When coronal holes appear near the centre of the disk we can estimate the density and kinetic temperature in the holes from the radio observations. For a hole observed on 1972 July 20–21, we find T ≈ 0.8 × 106 inside the hole and T ≈ 1.0 × 106 in average regions outside the hole. Inside the hole the density is estimated to be about one-quarter of that in Newkirk's model of the spherically symmetric corona. Variations in brightness at a fixed height above the limb are generally well correlated with scans at a similar height made with a K-coronameter. Occasional differences may result from streamers protruding beyond the limb from the back of the Sun. These can be seen by the K-coronameter but, because of refraction of the radio rays, not by the radio-heliograph.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151560
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  • 10
    Electronic Resource
    Electronic Resource
    A damped train of regular metre-wave pulses from the sun (1973)
    Springer
    Solar physics 32 (1973), S. 485-489 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The metre-wave observations presented here of a damped train of regular pulses from the Sun appear much simpler than other similar events previously described. The interpretations so far proposed for such phenomena do not adequately explain the asymmetry observed in this case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154961
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