on atmospheric processes in Antarctica

• Main Authors: O. Troshichev, L. Egorova, A. Janzhura, V. Vovk
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; Leningradskaya; Pacific; Russkaya; Soi; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.531.5567; http://sait.oats.inaf.it/MSAIt760405/PDF/2005MmSAI.76.890T.pdf

Abstract. The dramatic deviations of atmospheric winds from the regular pattern (anoma-lous winds) at two Antarctic coast stations located in the Western Pacific, Leningradskaya and Russkaya, and at the near-pole station Vostok have been examined in relation to strong disturbances in the interplanetary magnetic field (IMF), on the one hand, and ENSO vari-ations, on the other hand. The Southern Oscillation Index (SOI) has been used to charac-terize the phase and intensity of the ENSO activity. Taking into account that the negative SOI values tend to appear and develop strictly during March-August, the winds in the win-ter Antarctica were only analyzed. The anomalous winds at three stations turned out to be observed 1-2 months ahead of the event. On the other hand, the statistically significant rela-tionships between anomalous winds and the southward IMF take place. To check a possible link between the El-Nino events and Space Weather the behavior of SOI for 1987-2001 has been compared with variation of the AE index. It is shown, that El-Nino events follow the magnetic activity increase with delay time of 2-3 months. Key words. Solar wind, interplanetary electric field, Antarctica, atmosphere processes, anomalous winds, El-Nino Southern Oscillation. 1.