A satellite magnetometer observation of dusk-to-dawn current in the midnight magnetosphere at low-latitude Pi2 onset
© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002
Received: 13 June 2002
Accepted: 11 September 2002
Published: 21 June 2014
A multiple Pi2 event was observed in the midnight sector at the low-latitude ground magnetometer station. Meanwhile, particle fluxes in the midnight sector were measured during the multiple Pi2 event by the AMPTE/CCE spacecrafts in the L range from 4.8 to 5.8 and by geosynchronous satellite, S/C1984-129, at the dawn sector. We present an examination of the magnetic field changes and the associated particle behavior during the multiple Pi2 event. We argue that the temporal intensification of the dusk-to-dawn currents near the geosynchronous altitudes may trigger the Pi2 pulsations. The plasmas injected in the inner magnetosphere are possible candidate for driving the dusk-to-dawn currents.