第2回極域科学シンポジウム/第35回極域宙空圏シンポジウム 11月16日（水） 統計数理研究所 3階リフレッシュフロ

Akira Kadokura

Keisuke Hosokawa

Natsuo Sato

Tetsuo Motoba

Yasunobu Ogawa

National Institute of Polar Research Repository

  Simultaneous ground-satellite observations of meso-scale auroral arc undulations  Tetsuo Motoba1, Keisuke Hosokawa2, Yasunobu Ogawa1, Natsuo Sato1, and Akira Kadokura1 1National Institute of Polar Research 2University of Electro-Communications   We present simultaneous ground-based and in situ measurements of a train of meso-scale (about 100300 km) auroral arc undulations, occurring in the postmidnight sector (~1 MLT) between 0040 UT and 0054 UT on September 21, 2009.  The undulations appeared at the poleward edge of the preexisting diffuse aurora, and then moved eastward with a speed of 0.92.2 km s-1.  Dynamic behaviors of the associated meso-scale ionospheric plasma flows and current systems were also detected with the ground-based magnetometer and radar measurements within the all-sky camera field-of-view.  During the interval of interest, simultaneous Cluster observations in the central near tail region (1114 RE down tail) were available, and especially the ionospheric footprint of Cluster 2 (CL2) was close to the optical auroral forms.  Whenever a bright arc area (a trailing dark area adjacent to it) of the auroral undulations passed the CL2 footprint, CL2 observed strong perturbations in the in-situ By field with amplitude of 510 nT.  The By field changes at CL2 could be considered as a manifestation of localized upward and downward field-aligned current sheets moving eastward at the central near-Earth tail boundary, linked to the drifting meso-scale auroral structures.  

Simultaneous ground-satellite observations of meso-scale auroral arc undulations

https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=13526&item_no=1&attribute_id=16&file_no=1

Simultaneous ground-satellite observations of meso-scale auroral arc undulations

Abstract

Similar works

Full text

Available Versions

National Institute of Polar Research Repository