scholarly journals Solar Radio Bursts of Spectral Type V

1965 ◽  
Vol 18 (2) ◽  
pp. 143 ◽  
Author(s):  
The Late AA Weiss ◽  
RT Stewart
Keyword(s):  
Spectral Type ◽  
Solar Radio ◽  
Radio Bursts ◽  
Frequency Range ◽  
Solar Radio Bursts ◽  
Wave Type ◽  
Type V

The properties of the metre-wave type V burst have been-observed by interferometry in the frequency range 40-70 Mc/s, and by dynamic spectroscopy in the frequency range 5-210 Mc/s. Our investigations cover positions, movements, and angular sizes of the sources, and the spectrum and polarization of the emission.

scholarly journals The Positions and Movements of the Sources of Solar Radio Bursts of Spectral Type II

1963 ◽  
Vol 16 (2) ◽  
pp. 240 ◽  
Author(s):  
AA Weiss
Keyword(s):  
Spectral Type ◽  
Solar Radio ◽  
Radio Bursts ◽  
Type Ii ◽  
Frequency Range ◽  
Solar Radio Bursts ◽  
Dynamic Spectra ◽  
Type Ii Radio Bursts ◽  
Optical Flare ◽  
East West

The east-west position coordinates of the sources of 22 type II radio bursts, measured in the range 40-70 Mc/s using a swept-frequency interferometer, are analysed and discussed, in conjunction with dynamic spectra obtained in the frequency range 15-210 Mc/s. Many bursts are multiple and consist of a number of separate bursts excited by disturbances ejected in different directions from the vicinity of an optical flare, which may be equally complex.

A Scattering Hypothesis for Type V Solar Radio Bursts

1974 ◽  
Vol 2 (5) ◽  
pp. 261-263 ◽  
Author(s):  
D. B. Melrose
Keyword(s):  
Spectral Type ◽  
Solar Radio ◽  
Alternative Hypothesis ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Type V

The purpose of this paper is to advance an alternative hypothesis for the underlying distinction between solar radio bursts of spectral type V and ‘inverted U’ bursts, and to explore its implications.

scholarly journals The correlation of solar radio bursts by magnetic activity and cosmic rays

1959 ◽  
Vol 9 ◽  
pp. 210-213
Author(s):  
A. R. Thompson
Keyword(s):  
Cosmic Rays ◽  
Radio Astronomy ◽  
Solar Radio ◽  
Magnetic Activity ◽  
Radio Bursts ◽  
Type Ii ◽  
Frequency Range ◽  
Sweep Frequency ◽  
Solar Radio Bursts ◽  
Auroral Particles

The sweep-frequency equipment at the Harvard Radio Astronomy Station, Fort Davis, Texas, has now been running continuously since 1956 September, recording solar radio activity in the frequency range from 100 to 580 Mc/s. The following contribution describes preliminary investigations of the correlation of the radio data with solar corpuscular emissions. This work was initiated to examine the well-known suggestions that the origins of the type II and type III radio bursts are associated with the ejection of auroral particles and cosmic rays respectively.

A Preliminary Study of the Dynamic Spectra of Solar Radio Bursts in the Frequency Range 500-950 Mc/s.

1961 ◽  
Vol 133 ◽  
pp. 243 ◽  
Author(s):  
C. W. Young ◽  
C. L. Spencer ◽  
G. E. Moreton ◽  
J. A. Roberts
Keyword(s):  
Solar Radio ◽  
Radio Bursts ◽  
Frequency Range ◽  
Solar Radio Bursts ◽  
Dynamic Spectra ◽  
Preliminary Study

scholarly journals The Speed and Acceleration of the Sources of Type III And Type V Solar Radio Bursts Over Large Distances in the Corona

1965 ◽  
Vol 18 (1) ◽  
pp. 67 ◽  
Author(s):  
RT Stewart
Keyword(s):  
Active Region ◽  
Solar Radio ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Mean Velocity ◽  
Lower Corona ◽  
Type Iii ◽  
If Current ◽  
The Mean ◽  
Type V

The outward velocity and acceleration through the solar corona of the disturbances responsible for the emission of 50 type III bursts recorded on the Dapto radio spectrograph are investigated by applying standard electron density models for the corona to the frequency drift of each burst. If current models for an active region are assumed, the velocities often remain unchanged from the lower corona out to heights of at least two solar radii above the photosphere. The mean velocity is about ie. Speeds of sources of type III bursts followed by type V continuum are similar to those for isolated type III bursts.

scholarly journals An Investigation of the Speed of the Solar Disturbances Responsible for Type III Radio Bursts

1959 ◽  
Vol 12 (4) ◽  
pp. 369 ◽  
Author(s):  
JP Wild ◽  
KV Sheridan ◽  
AA Neylan
Keyword(s):  
Spectral Type ◽  
Solar Radio ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Plasma Oscillations ◽  
Type Iii ◽  
Solar Disturbances ◽  
Different Levels

The paper describes an investigation aimed at finding out whether solar radio bursts of spectral type III are due to disturbances which travel out through the corona with velocities exceeding O�lc, as predicted by the well-known hypothesis that the emissions are due to plasma oscillations. If the proposition is correct, emissions at different frequencies would be generated at different levels in the corona-the lower the frequency the higher the source. This property is tested by simultaneous directional observations at a number of frequencies between 40 and 70 Mc/s, using a swept-frequency interferometer.

The transverse motions of the sources of solar radio bursts

1959 ◽  
Vol 9 ◽  
pp. 176-185 ◽  
Author(s):  
J. P. Wild ◽  
K. V. Sheridan ◽  
G. H. Trent
Keyword(s):  
Automatic System ◽  
Solar Radio ◽  
Complex Data ◽  
Radio Bursts ◽  
Frequency Range ◽  
Solar Radio Bursts ◽  
Time Intervals ◽  
Initial Form ◽  
Phase Calibration ◽  
East West

Observations of the spectrum of solar radio bursts at meter wavelengths have indicated the desirability of measuring positions on the sun's disk not only as a function of time but also as a function of frequency. With this objective in view, we are now using a swept-frequency interferometer to determine the east-west disk coordinate of the transient solar sources at time intervals of ½ second and freqency intervals of about 5 Mc/s within the frequency range 40 to 70 Mc/s. The accuracy to which the centroid of the source is located is about ±1 minute of arc. In its initial form [1], the interferometer contained two aerials separated by a distance of 1 km. As a result of preliminary tests, two major additions have been made: (1) a second interferometer of much smaller spacing (¼ km) has been added to resolve the usual ambiguities associated with two-aerial interferometry, and (2) an automatic system of lobe-switching and phase-calibration has been incorporated to facilitate the reduction of the complex data recorded.

scholarly journals An Association Between Solar Radio Bursts at Metre and Centimetre Wavelengths

1959 ◽  
Vol 12 (4) ◽  
pp. 399 ◽  
Author(s):  
AA Neylan
Keyword(s):  
Synchrotron Radiation ◽  
Solar Radio ◽  
Broad Band ◽  
Radio Spectrum ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Type Iii ◽  
Broad Band Emission ◽  
Band Emission ◽  
Type V

From a study of simultaneous metre and centimetre solar radio bursts, it appears that the type III events which coincide with centimetre bursts are frequently followed by a particular form of broad� band emission. This last burst, termed type V, is observed mainly below 150 Mc/s on radio spectrum records where it resembles a bright glow lasting for about 1 min. Synchrotron radiation has been suggested as the mechanism for type V bursts.

scholarly journals The Association of Solar Radio Bursts of Spectral Type III with Chromospheric Flares

1957 ◽  
Vol 10 (4) ◽  
pp. 483 ◽  
Author(s):  
RE Loughhead ◽  
JA Roberts ◽  
Marie K McCabe
Keyword(s):  
Spectral Type ◽  
Solar Flares ◽  
Solar Radio ◽  
Radio Bursts ◽  
Radio Observations ◽  
Solar Radio Bursts ◽  
Type Iii ◽  
Class 1 ◽  
Relationship Of ◽  
The Relationship

The relationship of radio bursts of spectral type III to solar flares is investigated by comparing simultaneous optical and radio observations. Over 300 flares are examined, 85 per cent. of which are microflares (class 1?). About 20 per cent. of the flares are associated with type III events, while more than 60 per cent. of the bursts recorded occur during the lifetime of a flare. These bursts tend to occur near the beginning of the flare or even to precede it slightly.

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