Variation of Total Ozone during 24 August 2005 Magnetic Storm: A Case Study
- 1 Departamento de Física, Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, San Miguel de Tucumán, Argentina
Abstract
This paper presents the longitudinal distribution of total ozone along several latitudinal circles from both hemispheres during a strong geomagnetic storm that occurred on 24 August 2005 after a solar proton event (the maximum flux of protons with energy > 10 MeV was 1.70 × 10 7 protons cm -2. day -1. sr -1 on 23 August). For that, we use average daily values of total ozone observations (=column ozone amount) in Dobson units for the period 18-25 August 2005 ( obtained from the Total Ozone Mapping Spectrometer, TOMS). The considered storm occurred after a relatively quiet geomagnetic period and it is not superposed by another perturbation, which permit us to identify clearly the effects of the geomagnetic storm on total ozone. The results show s tatistically significant decreases in ozone a long the latitudinal circles 70 ° N and 70 ° S (summer and winter), no statistically significant effects at middle latitudes (40 ° S) and sparse statistically significant increases at low latitudes (20 ° S). The role of some mechanisms to explain the features observed is considered.
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