62 Result(s)

Article

Origin of the Solar Corona

IF the distributions of electron density and temperature in the sun's atmosphere are known, thermal emission at any frequency in the radio spectrum may be calculated. Conversely, properties of the atmosphere m...

J. H. PIDDINGTON, R. D. DAVIES in Nature (1953)

Article

Eruptive Prominence of February 26, 1953, and Associated Radio Noise-Burst: Radio Observations at the Time of an Ascending Solar Prominence

R. D. DAVIES in Nature (1953)

Article

A Method for the Measurement of the Distance of Radio Stars

THE existence of a large number of discrete sources of extraterrestrial radio radiation (radio stars) has now been established. For the majority of the sources there is no information about their distance; onl...

D. R. W. WILLIAMS, R. D. DAVIES in Nature (1954)

Article

An Alternative Identification of the Radio Source in the Direction of the Galactic Centre

A RADIO source the co-ordinates of which agree closely with those of the centre of the Galaxy has been reported by several observers, and it has been suggested that it may be identified with the nucleus of the...

R. D. DAVIES, D. R. W. WILLIAMS in Nature (1955)

Article

Red-Shift Absorption Spectrum of the Cygnus-A Radio Source

A MEASUREMENT to check the 21-cm. hydrogen line absorption spectrum of Cygnus-A (19N4A) reported by Lilley and McClain¹ is important in view of the cosmological significance of their result. The absorption was ob...

R. D. DAVIES, R. C. JENNISON in Nature (1959)

Article

Measurements of OH Emission Sources with an Interferometer of High Resolution

PREVIOUS experiments at Lincoln Laboratories, M.I.T.¹, California Institute of Technology² and Jodrell Bank (to be published) to determine the angular size of the OH emission regions have used interferometers wit...

R. D. DAVIES, B. ROWSON, R. S. BOOTH, A. J. COOPER, H. GENT, R. L. ADGIE… in Nature (1967)

Article

Structure of the Galactic Magnetic Field

Faraday rotation measurements have shown that there is a basic order in the galactic magnetic field which can be fitted by simple models. The data also indicate the presence of irregularities in electron densi...

R. D. DAVIES in Nature (1968)

Article

Interstellar Magnetic Fields determined from Zeeman Effect Measurements

THE Zeeman splitting of the 21 cm line in interstellar neutral hydrogen clouds provides the only direct measure of the line of sight component of the magnetic fields in the interstellar medium. It gives the fi...

R. D. DAVIES, R. S. BOOTH, A. J. WILSON in Nature (1968)

Article

Neutral Hydrogen Asymmetry in the Galaxy M101 as Evidence for Tidal Effects

Measurements of the distribution of neutral hydrogen in the galaxy M101 reveal an asymmetry which raises interesting points about tidal effects in galaxies due to nearby companions.

J. S. BEALE, R. D. DAVIES in Nature (1969)

Article

The Jodrell Bank Radio Frequency Digital Autocorrelation Spectrometer

A versatile digital autocorrelation spectrometer designed and built at Jodrell Bank is described, together with some examples of observations made with the new instrument.

R. D. DAVIES, J. E. B. PONSONBY, L. POINTON, G. DE. JAGER in Nature (1969)

Article

Distance of Pulsars and the Interstellar Electron Gas

Information about the interstellar distribution of hydrogen can help to refine estimates of pulsar distances.

R. D. DAVIES in Nature (1969)

Chapter

The Relative Density of H, OH and H₂CO in Interstellar Clouds

I have attempted to obtain an answer to the question “In which gas (neutral hydrogen) clouds do we find molecules?” By limiting the investigation to those clouds which might be considered normal (i.e. specific...

R. D. Davies in Highlights of Astronomy (1971)

Article

Spiral Arms in Space

The Spiral Structure of Our Galaxy

R. D. DAVIES in Nature (1971)

Article

Outer Spiral Structure and High Velocity Clouds in the Galaxy

New observations of high velocity clouds show that these may be interpreted in terms of an extension of the outermost spiral arm, confirming and extending the model of Habing.

R. D. DAVIES in Nature (1972)