Non-polar Auroral Light from the Night Sky in the Tropics

Details Non-polar Auroral Light from the Night Sky in the Tropics Non-polar Auroral Light from the Night Sky in the Tropics

Apr 1932

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1932natur.129q.545r&link_type=abstract

Nature, Volume 129, Issue 3258, pp. 545 (1932).

Physics

Scientific paper

IN a previous communication from one of us,1 it was stated that the brightness of the auroral green line in the northern and southern night skies at Poona (lat. 18° 31' N.) does not show the midnight maximum observed by Lord Rayleigh and by McLennan and his collaborators in temperate latitudes. Further estimates of intensity obtained by exposing Mimosa extreme orthochromatic plates through suitable green and orange filters, and with an aperture of about 45° towards the zenith, shows definitely that, in general, the brightness of the overhead sky gradually decreases from sunset to a minimum at about midnight, and increases after midnight.

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