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Author Ganguly, Nandita D. ♦ Iyer, K. N.
Source IACS Kolkata
Content type Text
Publisher Indian J. Phys.
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Ozone depletion, solar proton event (SPE) ♦ Coronal mass ejection (CME) ♦ HOx ♦ NOx
Abstract The ozone data obtained from Nimbus-7 and Earth probe Total Ozone Mapping Spectrometer (TOMS) has been used to study theimpact of coronal mass ejection (CME) on the columnar ozone concentration in India. A comparison of columnar ozone values for different solarproton events (SPE) observed at Srinagar indicates that although the 20th Jan., 2005 SPE was the most intense in the last 15 years, the ozone depletionwas found to be maximum in the 23rd March, 1991 event followed by 20th Jan., 2005, 4th Nov., 2001, 19th Oct., 1989 and 28th Oct., 2003 events. Acomparison between the ozone levels observed in different Indian cities for a few days after the 20th Jan., 2005 SPE indicates that the ozone values werefound to decrease sharply at higher latitudes compared to places located in the tropics .The ozone values measured by TOMS, Dobson Spectrometerand AURA Ozone Monitoring Instrument (OMI) were found to decrease for a short period from 20th January to 25th January after which the ozonelevels started recovering to normal values. The vertical ozone profiles obtained from Microwave Limb Sounder for New Delhi, indicate that the ozonemixingratio in the 3.0 to 10.0 hPa pressure range decreased consistently from 21st Jan., 2005 to 25th Jan., 2005 and thereafter, recovered by the 31stJanuary, 2005.
Education Level UG and PG
Learning Resource Type Article
Journal Indian J Phys
Volume Number 80
Issue Number 4
Page Count 5
Starting Page 335
Ending Page 339