Sunspot activity and associated temperature Variations

Abstract

From an investigation of daily relative sunspot numbers and maximum temperatures at 20 stations it is shown that during 1946-47 a significant relationship existed between the two variables continuously over period from about 60 to 300 days.  In the Indian region north of about Lat.  22^oN the temperature changes followed the changes in sunspot numbers by intervals of 12 to 18 days.  The response time was much shorter in the peninsular India, the interval being only 2 to 4 days.  At some stations in the interior Mysore, Rayalaseema and Telengana, the relationship was exceedingly strong, and lasted over long intervals.  Recurrent sunspot activity similar to 1946-47 is not encountered often and when present it lasts only for a few solar rotations.  At other times the activity is highly sporadic.  However, the results of the present investigation suggest that analysis of temperature data of stations where the response time is only of the order of 1 to 2 days may yield valuable information on the short-period (2 to 10 days) relationships between sunspot activity and air temperatures even during periods of sporadic sunspot activity.