Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 212
ity of the magnetic disturbance. (2) Occasionally so-called magnetic storms occur, duringwhich the compass-needle is sometimes violently disturbed. ASTRONOMY. I9I oscillating five degrees, or even ten degrees, within an houror two. These storms are generally accompanied by an aurora,and an aurora… … Fig. 207. (3) A number of observations render it very probable thatevery intense disturbance of the* solar surface is propagatedto our terrestrial magnetism with the speed of light. Fig. 207 shows certain of the solar lines as they wereobserved by Professor Young on Aug. 3, 1872. The contor-tions…
Astronomy
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