Physics
Scientific paper
Jan 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961natur.189..127w&link_type=abstract
Nature, Volume 189, Issue 4759, pp. 127-128 (1961).
Physics
28
Scientific paper
THE existence of a high concentration of interplanetary dust near the Earth has recently been demonstrated from rocket, satellite and space-probe observations of acoustical impact. Suspected by Beard1, the concentration has been proved by me2 and by Hibbs3. To a distance of approximately 105 km., the concentration falls off roughly as the inverse 1.4 power of the distance from the Earth's surface (Fig. 1). The impact-rates on randomly oriented surfaces include all particles greater than mass 10-9 gm. and are adjusted for the differing sensitivities of the equipment. Data are from six U.S. rocket firings; from satellites Explorer I (1958 Alpha), Sputnik III (1958 Delta) and Vanguard III (1959 Eta) ; and from the space probes Explorer VI (1959 Delta) and Pioneer I. At some distance greater than 105 km., the impact-rates approximate those expected from calculations on the zodiacal cloud ; the maximum concentration with respect to the interplanetary medium is perhaps as high as 105.
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