The Tenth Symposium on Polar Science/Ordinary sessions: [OS] Space and upper atmospheric sciences, Wed. 4 Dec. /  Institute of Statistics and Mathematics (ISM) Seminar room 2 (D304) (3rd floor

Akira Kadokura

Akira Yukimatu

Natsuo Sato

Tohru Sakurai

Tomoaki Hori

Yoshimasa Tanaka

National Institute of Polar Research Repository

  Pc5 enhancement of auroral arc and modulation of diffuse/pulsating aurora   Natsuo Sato1, Akira Sessai Yukimatu1,2, Yoshimasa Tanaka1,2,3, Tomoaki Hori4, Akira Kadokura1,2,3 , Tohru Sakurai5 1NIPR 2SOKENDAI 3ROIS-DS 4ISEE, Nagoya University 5Tokai University  There are two types of auroral luminosity pulsations. The first type is a short-period pulsation with the main period of a few to a few tens of seconds, which is called pulsating aurora (PsA). The second type is a longer period pulsation in the Pc5 (150–600 s) period range, which is called long-period auroral pulsation. The long-period auroral pulsations have two categories: one is arc aurora luminosity pulsation and other is a patch aurora luminosity modulation. We examined the two different types of long period auroral pulsations, which occurred in association with the Pc5 magnetic pulsations. To understand the generation mechanism of the long period auroral pulsation we focused on events in which the arc pulsation and the patch intensity modulation were observed simultaneously. In general an arc aurora appears just on the poleward side of patch aurora including pulsating aurora. In this study, we examined the temporal and spatial signatures of the two types of long period auroral pulsations using the data obtained by the ground and the geostationary GOES satellite coordinated observations.  

Pc5 enhancement of auroral arc and modulation of diffuse/pulsating aurora

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Pc5 enhancement of auroral arc and modulation of diffuse/pulsating aurora

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