bright auroramaximum poleward advanceOne of the central issues in substorm research is what determines the substorm intensity. Through an introduction on what constitutes a magnetospheric substorm, we discuss several parameters which are available to measure the substorm intensity. In terms of ionospheric...
e show generallythatwithina randomdirectionwavefield,wavelengthlsargecomparetdo theinterfer- ometerlengthproducelargecoherenc(ynearly1),butwavelengthtsheorderof a fewtimesthein- terferometelerngtho, rsmallerp, roducesmallcoherenc(yclosetozero).We applythisprinciple firstto examiningaurorahl issandlower...