Accession Number : ADA131448

Title :   Geomagnetic Pulsations-Production/Interpretation.

Descriptive Note : Final scientific rept. 1 Sep 78-30 Sep 81,

Corporate Author : EMMANUEL COLL BOSTON MA

Personal Author(s) : Maple,Elwood

PDF Url : ADA131448

Report Date : Sep 1982

Pagination or Media Count : 58

Abstract : Work has been devoted to experimental studies of middle-latitude geomagnetic pulsations in the period range 0.2 to 50 minutes. The principal effort has been on the resonant periods of the pulsations which arise from hydromagnetic resonances in the magnetosphere. The resonant periods appear as peaks in the period distributions and frequency spectra of the pulsations. The present work utilizes polarization traces which provide continuous displays of the polarization of the pulsations in selected period bands. This analysis technique was conceived some time ago. The early studies established that hydromagnetic (HM) waves were frequently observed throughout the 0.2 to 50 minute period range and that waves of several different periods were often observed simultaneously during both magnetically quiet and disturbed intervals. That effort was terminated before the potentialities of the technique had been exploited, and the early results were not widely disseminated. Some of the original data have been resurrected for the initial work under this grant, and the analysis technique has been extended.

Descriptors :   *Geomagnetism, *Pulses, *Magnetohydrodynamics, Magnetosphere, Magnetic resonance, Standing waves, Polarization, Bandpass filters, Waveforms, Harmonics, Magnetometers, Plasmasphere

Subject Categories : Geomagnetism
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE