Accession Number : AD0669492

Title :   VLF ELECTRIC AND MAGNETIC FIELDS OBSERVED WITH THE JAVELIN 8.45 SOUNDING ROCKET,

Corporate Author : IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Shawhan,Stanley D. ; Gurnett,Donald A.

Report Date : MAR 1968

Pagination or Media Count : 55

Abstract : The Javelin 8.45 rocket VLF experiment flown from Wallops Island at 07:38 UT, 21 September 1967, to an altitude of 763 km is described and the experiment results are discussed. This experiment carried three electric dipole and three magnetic loop antennas, five wideband receivers (30 Hz to 10 KHz), one step frequency receiver (7 KHz to 70 KHz), an instrument to measure the phase and magnitude of the electric antenna impedance (20 KHz to 20 Hz) and a VLF transmitter in the nose cone. A noise band between about 7.5 KHz and 30 KHz was observed with both the electric and magnetic receivers. The field geometry of this noise suggests that the noise is propagating perpendicular to the geomagnetic field and that the lower cutoff frequency may be the lower hybrid resonance frequency. Some evidence suggests that this electric antenna noise may be generated by the motion of the payload. (Author)

Descriptors :   (*SOUNDING ROCKETS, MAGNETIC FIELDS), (*ATMOSPHERIC SOUNDING, ELECTRIC FIELDS), ELECTROMAGNETIC FIELDS, VERY LOW FREQUENCY, EMISSIVITY, NOISE(RADIO), PAYLOAD, INSTRUMENTATION, LOOP ANTENNAS, ALTITUDE, RADIO TRANSMITTERS, BROADBAND, PHASE STUDIES, INTENSITY, ATMOSPHERICS

Subject Categories : Atmospheric Physics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE