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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Polarization measurements of unusual cases of medium frequency burst emissions extending below 1.5 MHz

Fig. 5

a The average value of frequency of the lower cutoff of MFB emission, as a function of the magnetic field strength 100 km above the observing station. The frequency increases with magnetic field strength. Values of the electron gyrofrequency at altitudes of 100–400 km are indicated for reference. b Altitudes where the electron gyrofrequency matches the top and bottom frequency of the gap in MFB emissions, for selected spectra at each observing site

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