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Article
Preliminary observations of solar radio sources with the Culgoora radioheliograph operating at four frequencies
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 ...
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Chapter
Evidence for Open Field Lines from Active Regions: Short Communication
A paper that has considerable relevance of the subject matter of this symposium is the following: “Evidence for Extreme Divergence of Open Field Lines from Solar Active Regions,” by G. A. Dulk (Division of Rad...
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Chapter
The Association of Type III Bursts and Coronal Transient Activity
Metric Type III radio bursts are nearly always associated with solar active regions. In particular, the occurrence of Type III bursts within a few minutes of the onset of the solar flares (Wild et al. 1954) is...
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Chapter
Radio Observations of Coronal Holes
Coronal holes have been observed on several occasions with the 80 and 160 MHz radioheliograph at Culgoora. At 160 MHz the holes invariably appear as areas of low brightness, either on the disk or at the limb. ...
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Article
Observations of the circular polarization of fundamental and harmonic type III bursts throughout the frequency range 24 to 220 MHz
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Article
Radio and EUV studies of coronal holes
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Article
Radio and EUV observations of a coronal hole
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, ...
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Article
White light and radio studies of the coronal transient of 14–15 September 1973
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-interferomete...
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Article
The structure of the middle corona from observations at 80 and 160 MHz
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 ma...
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Article
Coronal magnetic field structure derived from two-frequency radioheliograph observations
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 r...
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Chapter
Coronal Magnetic Field Structure Derived from Two-Frequency Radioheliograph Observations
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 radio-heliograph at 80 and 160 MHz.
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Chapter
Observations of Split-Band Harmonic Type II Bursts with the Culgoora Radioheliograph at 80 and 160 MHz
(Solar Phys.) When the Culgoora radioheliograph started operating at both 80 MHz (the initial frequency) and 160 MHz (from May 1972) it became possible for the first time to make simultaneous observations of the ...
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Chapter
On Split-Band Structure in Type II Radio Bursts from the Sun
(Astrophys. Letters). The measured amount of band-splitting, Δf, in the spectra of nine harmonic type II bursts is illustrated in Figure 1. Here, as in previous, smaller samples (Roberts, 1959; Maxwell and Thomps...
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Article
A damped train of regular metre-wave pulses from the sun
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 phen...
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Article
Radio evidence of twisted bi-polar magnetic fields in the solar corona
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 t...
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Article
Regular Pulses from the Sun and a Possible Clue to the Origin of Solar Cosmic Rays
A CURIOUS but rare feature of the metre–wave continuum (type IV) radiation received from certain large solar flares is the pulsating structure which modulates the intensity in a periodic or quasi-periodic manner1...
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Article
Evidence of type II and type IV solar radio emission from a common flare-induced shock wave
A solar radio outburst is described in which a moving type IV burst is observed to break up into several components. A close association is found to exist between this source and a type II burst which occurred...
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Article
80 MHz Photography of the Eruption of a Solar Prominence
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 emissions.
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Article
Absorption of 3.5-m. Radiation in the Optical Emission Nebula, NGC 6357
IN the course of a radio survey of bright emission nebulæ with the 1,500-ft. Sydney cross-aerial, some fourteen nebulæ were studied at a wave-length of 3.5 m. Six were probably observed in emission, seven were...
