6:15 PM - 7:30 PM
[PEM28-P16] Spatial characteristic of mid- and low-latitude Pi2 pulsations observed by the Swarm satellite in the upper ionosphere
In this study, we compare Pi2 pulsations observed in the upper ionosphere and on low-latitude ground, using the magnetic field data obtained by the Swarm satellite and at Kakioka (KAK, 27.19 degrees geomagnetic latitude, 208.79 degrees geomagnetic longitude) and San Juan (SJG, 28.20 degrees geomagnetic latitude, 6.10 degrees geomagnetic longitude). The Swarm satellite was launched on November 2013 and consists of the three identical satellites (Swarm-A, -B, and -C) in polar orbits. We statistically investigate Pi2 pulsations observed by the Swarm satellites. On the nightside, Pi2 pulsations in the compressional and radial components have high coherence with those at the low-latitude ground stations. On the other hand, Pi2 pulsations observed by Swarm on the dayside do not show high coherence with those on the low-latitude ground stations. We will show typical Pi2 events observed by the Swarm satellites at different local times and discuss possible mechanisms of low-latitude Pi2 pulsations.