By National Academy of Sciences, ed. by H. Odishaw & S. Ruttenberg U.S. National Committee for the International Geophysical Year
About The Product
Published by means of the yank Geophysical Union as a part of the Geophysical Monograph Series.
The current quantity assembles a bunch of papers overlaying a wide selection of subject matters in geophysics. those papers have been awarded at a unique symposium, June 28 and 29, 1957, performed by means of the U.S. nationwide Committee for the foreign Geophysical yr previous to the IGY software officially began.
The papers aren't basically of basic and ancient curiosity, yet lots of them include stories on early result of the IGY. even supposing the IGY officially started on July 1, 1957, a couple of our personal tasks have been initiated significantly sooner than that point; in addition, convinced geophysical learn which shaped the foundation for the IGY departure is usually encompassed during this quantity. eventually, the papers offer not just the prestige of our tasks at first of the IGY yet usually current experiences of the final prestige of a self-discipline. For all of those purposes, the Committee believes that the current quantity could be of price to geophysicists widely.
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Dinger of the Naval Research Laboratory, and the author, each heard this presentation and reacted in somewhat similar fashion: What an ideal object of basic research combining interest in radio wave propagation, geophysics, and solarterrestrial relationships! Each of us has been amply rewarded in the five years which have passed since that time. At Dartmouth we were engaged in high-frequency studies for the U. S. Navy Bureau of Ships and it was by their indulgence that we got started. Whistlers are audio-frequency radio waves arising from lightning flashes.
When this restriction was removed a different equation was obtained which predicted a most surprising characteristic [Helliwell and others, 1956]. f ( IH — f) 3 / 2 /bno (2) which reduces to (1) when hi is large compared with f. It shows that when the whistler frequency becomes one-quarter of the gyrofrequency the group velocity reaches a maximum (corresponding to minimum time delay) and decreases for either increasing or decreasing frequencies. The new theory thus predicted a double whistler with simultaneous falling and rising components.
Soc. , 39, 413, 1949. , The study of the solar corona and prominences without eclipses, Mon. Not. R. Asiron. , 99, 580, 1939. , Le filtre monochromatique polarisant, Ann. d'Astrophysique, 1, 31, 1944. , Tower telescopes and ac- cessories, The Sun, G. P. ), Univ. Chicago Press, pp. 605-626, 1953. PAWSEY, J. , AND S. F. SMERD, Solar radio emission, The Sun, G. P. ), Univ. Chicago Press, pp. 466-531, 1953. ROBERTS, W. , Ninth Report of the Commission for Study of Solar Terrestrial Relationships, Int.