Occurrence of EMIC Waves in the Magnetosphere According to Their Distance to the Magnetopause

Wave growth of electromagnetic ion cyclotron (EMIC) emissions observed in the outer magnetosphere is mainly controlled by compression events resulting from solar wind dynamic pressure pulses. During such wave expected to be maximum close magnetopause. In previous studies, distribution EMIC waves was analyzed according their distance Earth, which inadequate for studying magnetopause region. We map a data set Time History Events and Macroscale Interactions during Substorms (THEMIS) spacecraft case-by-case modeled occurrence rate found within two Earth radii then it linearly decreases with an increasing distance, especially local noon. Asymmetries between morning evening magnetic sectors are explained asymmetries upstream conditions presence another population different origin.