Global morphology and spectral properties of EMIC waves derived from CRRES observations

Gyroresonant wave particle interactions with electromagnetic ion cyclotron (EMIC) waves are a potentially important loss process for relativistic electrons in the Earth's radiation belts. Here we perform a statistical analysis of the EMIC waves observed by the Combined Release and Radiation Effects Satellite (CRRES) to determine the global morphology and spectral properties of the waves and to help assess their role in radiation belt dynamics. Helium band EMIC waves, with intensities, inline image, greater than 0.1 nT2, are most prevalent during active conditions (AE > 300 nT), from 4