4:00 PM - 4:15 PM
[PEM18-15] Conjugate observation of auroral finger-like structures by ground all-sky cameras and the THEMIS sarellite
Keywords:THEMIS, All-sky imager, auroral finger-like structure, magnetosphere
In this study, we observed finger-like structures of aurora using the THEMIS satellites and ground all-sky imagers to investigate physical processes that cause auroral fragmentation. We succeeded the first conjugate observation of auroral finger-like structures with magnetospheric satellites and investigated dynamical variation of magnetospheric plasma.
We searched conjugate ground-satellite events for the interval between October 2007 and December 2014. However, we found only one conjugate event that is observed at Narsarsuaq (MLAT: 69.3) in Greenland at 0720-0830UT (0506-0616LT) on 17 February 2012. Investigation of the event produced following observation facts: plasma pressure and magnetic pressure fluctuate in anti-phase with time scales of 5-20min, parallel electron flux and plasma pressure fluctuate in same time scales, and perpendicular ion velocity is very small (less than 50km/s) during the event.