The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 212
ASTRONOMY. 191 oscillating five degrees, or even ten degrees, within an houror two. These storms are generally accompanied by an aurora,and an aurora is always accompanied by magnetic disturbance.A careful comparison of aurora observations with those of sun-spots shows an almost perfect parallelism… … 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 of…
Astronomy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
