Authors: K. Bamert, R. Kallenbach, N. F. Ness, C. W. Smith, T. Terasawa,
M. Hilchenbach, R. F. Wimmer-Schweingruber, and B. Klecker
Reference: ApJL 601, L99-102 (2004)
Abstract:
Using data of the Highly Suprathermal Time-Of-Flight sensor of the Charge,
Element, and Isotope Analysis System on board the Solar and Heliospheric Observatory
spacecraft located at Lagrangian point L1 near Earth, we have measured proton
spectra in the energy range 60 keV-2 MeV associated with the Bastille Day
coronal mass ejection of 2000 July 14-16. For the same event, the power spectral
densities of the magnetic field fluctuations in the solar wind have been
measured with the magnetometer on board the Advanced Composition Explorer
in the frequency range from about 0.05 mHz to 0.5 Hz. Within 0.11 AU upstream
of the main shock, the flux of protons in the energy range 150 keV-2 MeV
decreases much more rapidly with distance from the shock than is expected
from diffusion in typical solar wind magnetic turbulence. In the same upstream
region, the excitation of hydromagnetic waves in the frequency range 0.25-3
mHz and with power spectral density levels of up to 100 times the typical
levels in the ambient solar wind is observed.