摘要：On the records of electron densities obtained by the Langmuir probe, the superpositions of rapid fluctuations (10-100Hz) are often detectable in the auroral E region. These density irregularities have not been investigated in detail because the design of the Langmuir probe method used in the past is not adequate to clarify this phenomenon. A new three spherical probes method is proposed for the self-consistent observation of the electron density, and DC electric field together with the spectra of the small scale irregularities. The possibility of measuring the propagation vector of AC fields is also discussed.
