Other
Scientific paper
Sep 1947
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1947natur.160..395c&link_type=abstract
Nature, Volume 160, Issue 4064, pp. 395 (1947).
Other
1
Scientific paper
IN a most comprehensive and interesting study of the magnetic field of massive rotating bodies, Prof. P. M. S. Blackett1 has revived and discussed the formula for the magnetic moment P of such a body, with angular momentum U, where G denotes the gravitational constant, c the speed of light and β a constant of order unity. For the earth, taking account of the central condensation, he finds β = 0.30. For the sun, taking its field to be that of a dipole, with polar intensity 52 gauss, and making reasonable assumptions as to its central condensation and mean angular speed, he finds β = 1.14. For 78 Virginis, the magnetic field of which has lately been detected by H. W. Babcock2a, by a pioneer research brilliant both in conception and execution, Blackett similarly finds β = 1.16. More recently2b,c, Babcock has made determinations for certain other stars, most notable being that for the peculiar A-type star B.D.-18° 3789 , (HD 125248), for which the polar field is found to be 5,500 gauss; this is the strongest measured natural magnetic field, so that this star displaces sunspots as the most naturally magnetic region known.
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