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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 3
Ann. Geophys., 18, 332–336, 2000
https://doi.org/10.1007/s00585-000-0332-3
© European Geosciences Union 2000
Ann. Geophys., 18, 332–336, 2000
https://doi.org/10.1007/s00585-000-0332-3
© European Geosciences Union 2000

  31 Mar 2000

31 Mar 2000

Total ozone decrease in the Arctic after REP events

V. C. Roldugin1, M. I. Beloglazov1, and G. F. Remenets2 V. C. Roldugin et al.
  • 1Polar Geophysical Institute, Apatity, Murmansk reg., Russia
  • E-mail: roldugin@pgi.kolasc.net.ru
  • 2Institute of Radiophysics, University of St.-Petersburg, Russia
  • Correspondence to: V. C. Roldugin

Abstract. Eight periods of relativistic electron precipitation (REP) with electron energies of more than 300 keV are identified from VLF data (10-14 kHz) monitored along the Aldra (Norway) - Apatity (Kola peninsula) radio trace. In these cases, anomalous ionization below 55-50 km occurred without disturbing the higher layers of the ionosphere. The daily total ozone values in Murmansk for six days before and six days after the REP events are compared. In seven of eight events a decrease in the total ozone of about 20 DU is observed. In one event of 25 March, 1986, the mean total ozone value for six days before the REP is bigger than that for six days after, but this a case of an extremely high ozone increase (144 DU during the six days). However, on days 3 and 4 there was a minimum of about 47 DU with regard to REP days, so this case also confirms the concept of the ozone decrease after REP. The difference between mean ozone values for periods six days before and six days after the REPs was found also for 23 points in Arctic on TOMS data. The difference was negative only in Murmansk longitudinal sector. Along the meridian of the trace it was negative at high latitudes in both hemispheres and was near zero at low latitudes.

Key words: Atmospheric composition and structure (middle atmosphere - composition and chemistry) - Meteorology and atmospheric dynamics (polar meteorology)

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