Magnetic field power density spectra during 'scatter-free' solar particle events

Abstract

view Abstract Citations (8) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Magnetic Field Power Density Spectra during ``Scatter-free'' Solar Particle Events Tan, L. C. ; Mason, G. M. Abstract We have examined interplanetary magnetic field power spectral density during four previously identified 3He-rich flare periods when the about 1 MeV nucleon-1 particles exhibited nearly scatter-free transport from the sun to 1 AU. Since the scattering mean free path A was large, it might be expected that interplanetary turbulence was low, yet the spectral density value was low only for one of the four periods. For the other three, however, the spectral index q of the power density spectrum was near 2.0, a value at which quasi-linear theories predict an increase in the scattering mean free path. Comparing the lambda values from the energetic particles with that computed from a recent quasi-linear theory which includes helicity and the propagation direction of waves, we find lambda(QLT)/lambda(SEP) = 0.08 +/- 0.03 for the four events. Thus, the theory fits the q-dependence of lambda; however, as found for previous quasi-linear theories, the absolute value is low. Publication: The Astrophysical Journal Pub Date: May 1993 DOI: 10.1086/186852 Bibcode: 1993ApJ...409L..29T Keywords: Interplanetary Magnetic Fields; Power Spectra; Solar Activity Effects; Solar Cosmic Rays; Mean Free Path; Particle Acceleration; Solar Flares; Astrophysics; ACCELERATION OF PARTICLES; ISM: COSMIC RAYS; MAGNETIC FIELDS; SUN: FLARES; SUN: PARTICLE EMISSION full text sources ADS |