Propagation pattern of auroral hiss: Detailed analysis of multicomponent data received by the Polar PWI high frequency waveform receiver on March 6, 1997. (a) Spectrogram of the electric components; (b) spectrogram of the magnetic components; (c) parallel component of the Poynting vector normalized by its standard deviation; (d) the same for the component in the meridian plane; (e) angle deviation of the wave vector from the ambient magnetic field; (f) azimuth of the wave vector measured from the meridian plane; (g) 2D degree of coherence in the magnetic polarization plane. Universal time (UT), radial geocentric distance (R) in Earth radii, the magnetic dipole latitude (MLAT) in degrees, the magnetic local time (MLT) in hours, and McIlwain's parameter (L) are on the bottom. Local electron cyclotron frequency is displayed on the spectrograms. Analysis results are shown only for sufficiently strong electromagnetic signals. (From Santolik and Gurnett, 2002.) |