30 H. Wild, Das magn. üngewitter vom 30. Jan. bis 1. Febr. (n. St.) 1881. 
scured. Düring tliis Aurora the tliree self-recording magnets werc very much disturbed, 
their movements being all rapid and extended. Daring the whole of the morning of the 
31 -st. the Declination was ver}^ irregulär but it was only about noon that tho storm be- 
gan in earnest. From 3 30 until 9 p. m. the Declination Magnet was oscillating incessantly 
in long vibrations, several of fully a degree in extent; and between 7 53 and 8 p. m. the 
Western bearing increased by l"" 37' 24''. Many other movements were nearly equally ra- 
pid, but not so extensive. The movements of the horizontal force Magnet were irregulär 
from Noon tili after Midnigiit, and they лѵеге very much exaggerated between 3 45 p. m. 
and 8 15; the most rapid change was the remarkable diminution of 2'_°1 in the Ordinate 
between 6 14 and 6 20 p. m.; this was preceded by a very quick rise, and followed by an- 
other, nearly equallz sharp. 
The Vertical force Magnet was most irregulär between 2 p. m. on 31 -st and 1 am on 
the morning of 1-st. The extreme maximum was attained at 4'' 20"\ and the two principal 
Minima at 8^ 12"^p.'m., and 12"' after Midnigiit. The Movement was most rapid at 8 p. m., 
and this principal disturbance on all the curves coincided with the grand outbursts of red 
streamers which converged towards a point some 30° soutli of the zenith. 
Stonyhurst Observatory S. J. Perry. 
