Magnetic field micropulsations and electron Bremsstrahlung

This note is to report the observation of enhanced magnetic micropulsation activity in the auroral zone near College, Alaska, simultaneous with increases in the intensity of bremsstrahlung from energetic electrons. Measurements of the magnetic field fluctuations were made with a 2-meter-diameter loop antenna of 21,586 turns with its axis in the magnetic northsouth direction. The system had a flat response to magnetic flux density in the frequency range of 0.4 to 0.04 c/s. Balloon flights were made near the same site [Brown, 1961] in June and July 1960.