Power spectra of low frequency MHD turbulence up- and downstream of interplanetary fast shocks within 1 AU

Details Power spectra of low frequency MHD turbulence up- and downstream of interplanetary fast shocks within 1 AU Power spectra of low frequency MHD turbulence up- and downstream of interplanetary fast shocks within 1 AU

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4..439l&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences (ISSN 0980-8752), vol. 4, Dec. 1986, p. 439-446.

Physics

Interplanetary Space, Low Frequencies, Magnetohydrodynamic Turbulence, Power Spectra, Shock Waves, Interplanetary Magnetic Fields, Mach Number, Radial Distribution, Spectral Methods

Scientific paper

Studies of cosmic ray modulation and Fermi acceleration of charged particles at interplanetary shock waves benefit from information on the characteristics of low frequency MHD turbulence immediately upstream and downstream of these events. Using 40.5 s averages of the magnetic field and plasma parameters preceding and following 20 fast transient interplanetary shock waves, power spectra covering the frequency range from 3.9 x 10 to the -4th to 1.2 x 10 to the -2nd Hz were computed. These shocks were observed by the Helios spacecraft at heliocentric radial distances between 0.29 and 1 AU and with various angles between the shock normal and the upstream magnetic field direction. An increase with increasing distance in the upstream and downstream wave activity is observed, particularly in the compressional fluctuations, whereas a radial decrease has been reported for the average, nonshock associated Alfvenic turbulence.

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