Similarity and dissimilarity of conjugate relationships of Pi magnetic pulsations observed during excellent similar auroras

• Main Authors: Tohru Sakurai, Akira Kadokura, Natsuo Sato, Yutaka Tonegawa
• Format: Report
• Language: English
• Published: Department of Aeronautics and Astronautics, School of Engineering, Tokai University/National Institute of Polar Research/National Institute of Polar Research/Department of Aeronautics and Astronautics, School of Engineering, Tokai University 2006
• Subjects: Pi magnetic pulsations; conjugate relationships; auroras; magnetosphere physics; Syowa Station; Antarc*; Antarctica; Iceland; Advances in polar upper atmosphere research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6416; http://id.nii.ac.jp/1291/00006416/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6416&item_no=1&attribute_id=18&file_no=1

Similarity and dissimilarity of conjugate relationships of Pi magnetic pulsations observed during excellent similar auroras at the conjugate stations, Tjornes in Iceland and Syowa Station in Antarctica are examined. The study revealed that characteristic Pi pulsations, Pi 2 pulsations and impulsive Pi 1 pulsations were prominently observed with a close relationship to aurora activities. During the substorm growth phase they showed a good similarity between the conjugate stations. How ever, at the onset of substorm expansion, the appearance of Pi pulsations showed prominent dissimilarity between the conjugate stations, suggesting that there might be some asymmetry of the ionosphere and magnetosphere conditions in between the northern and the southern hemispheres.