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T h e magne t i c O b s e r v a t o r y at A l i b a g (18"38'/V, 72" 52 ' E , 1 8 m i l e SS E of C o l a b a , B o m b a y I is situateti at a low magnet ic l a t i t u d e ( 9'-.5 N). T h e v a r i o m e t e r s a re u s u a l l y r u n on a t ime scale of 15 min, h r . T h o u g h the b r o a d f e a t u r e s of a magnet ic p h e n o m e n o n a re recorded , ihe d e t a i l e d p r o f i l e d u r i n g such per iods can o n l y he o b t a i n e d w h e n an open t i m e scale is used. F o r t h e last f e w years , 011 specia l occasions, t h e i n s t r u m e n t s b a v e been r u n at 1 8 0 m m / h r . It inay j u s t he poss ib le to an t i c ipa te and put t h e q u i c k r u n in act ion f o r magne t i c s to rms and he f o r t u n a t e in ob ta in ing deta i led records of t h e sanie. A m o n g t h e f e w p h e n o m e n a t l iat can h a r d l y he ant ic ipatet i at p resent is t h e so lar Ilare e f fec t o r the 'Crochets ' . A n y sudi r e c o r d i n g of t h e so la r Ilare w o u l d he acc identa l . W h i l e t h e magnetic r e c o r d e r s h a d been on qu ick run , on J u n e 13 th . 1 9 5 1 , a r emar k a b l e r e c o r d was o b t a i n e d . T h e so lar flare e f fect c o m m e n c e d on t h e record at A l i b a g at 0 5 4 6 G M T and t h e e f fec t was o v e r a f t e r about 1 4 0 minutes . S o l a r flares w e r e v i s u a l l y r e c o r d e d at K a n z e l h o h e , Meudon, Zi i r ich , S a l t s j o b a d e n and Hers tn ionceux a b o u t tha t t ime of the day. T h e p a r t i c u l a r o b s e r v a t i o n s c o r r e s p o n d i n g to the c rochet a r e :

THE SOLAR FLARE EFFECT AT ALIBAG ON JUNE 13th. 1951