Аннотация:We study the topology of high latitude plasma domains and reanalyze the problem of the auroral
oval mapping without using magnetic field models. The location of the trapping boundary of
energetic particles inside the auroral oval is demonstrated. We compare the distribution of plasma
pressure at low altitudes using data of DMSP observations and plasma pressure at the equatorial
plane using data of THEMIS mission. It is shown that most part of the auroral oval is mapped to the
surrounding the Earth plasma ring at geocentric distances smaller than 10-12Re in contrast to the
ordinary suggestion of the auroral oval mapping to the plasma sheet proper. Transverse currents in
the ring are the high latitude continuation of the traditional ring current. We show that obtained
results can help in the creation of the non contradictory explanation of many magnetospheric
phenomena including the formation of quite auroral arc in the conditions of the high level of
plasma sheet turbulence. The main reasons leading to the real changes of the well established
positions are discussed.