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Electron flux characteristics observed by THEMIS and DMSP spacecraft associated with Pc 5 auroral arc pulsations

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Electron flux characteristics observed by THEMIS and DMSP spacecraft associated with Pc 5 auroral arc pulsations

Natsuo Sato

1,2

, Akira Sessai Yukimatu

1,2

, Yoshimasa Tanaka

1,2

, Tomoaki Hori

3

, Akira Kadokura

1,2

1

National Institute of Polar Research

2

The Graduate University for Advanced Studies

3

Institute for Space-Earth Environmental Research, Nagoya University

Pc 5 auroral arc pulsations observed on the ground exhibit east-west-aligned auroral arcs elongated ~ 1000-3000 km and

behave poleward moving form with the recurrence period of ~ 2-10 minutes (Pc 5 range). Ground-based magnetic field

variations (Pc 5 magnetic pulsations) are associated with the luminosity pulsations. Previous study reported that this type of Pc

5 magnetic pulsations could be generated by the field-line resonances (FLRs). We examined the ground-space coordinated

observations with the THEMIS spacecraft whose footprint traversed near the region of Pc 5 auroral arc pulsations observed on

the ground. Field and particle characteristics observed by the spacecraft are as follows: 1) Electric field variations and plasma

velocity modulations show one to one correlation with the Pc 5 auroral luminosity pulsations, 2) Magnetic field variations also

show the same periods but the wave form is not so clear as that of electric field and plasma velocity variations, 3) Occasionally

electron flux shows the same modulation as the electric field variations. In this study we focus on the characteristics of electron

flux variations in association with the Pc 5 auroral arc pulsations observed onboard the THEMIS and DMSP spacecraft. The

THEMIS satellites were located near the equatorial plane in the magnetosphere and the DMSP satellites traversed in the

ionosphere and crossed over the field of view of all-sky imager at Syowa Station.

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