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Some remaining contributions were read in a first part of this session. R. F. Benson (Goddard Space Flight Center, GSFC, Greenbelt, Md., USA) read two papers concerned with resonances observed in topside sounders. The first paper considered the small frequency shifts which are found for successive harmonics of the electron gyro frequency, ƒ<sub>B</sub>. When the magnetic field is computed from observed frequencies, there is agreement with the result of the well‐known computer programs (using Legendre development) for the sixth‐order resonance. |