Description of the PC index


      The PC index characterizes the polar cap magnetic activity, generated by the geeffective interplanetary electric field (Em). The index is derived by magnetic data of only two stations Thule and Vostok, located in the northern (PCN) and southern (PCS) near-pole regions. The index was put into practice about 25 years ago, but obtained his final design as late as 2006. The unified procedure provides the on-line calculation of the PCN and PCS indices consistent the Em value irrespective of the UT time, season and solar cycle. The full description of procedure adopted in AARI for derivation of the unified PC index is given on the report:

hghg PC_description_final.pdf