An Inner Magnetosphere Empirical EMIC Wave Amplitude Prediction Model

We have developed an empirical model which can estimate inner magnetosphere (L ≤ 7) electromagnetic ion cyclotron (EMIC) waves. Measurements from the Van Allen Probes (r = 1.1 - 5.8 Re) are used. EMIC wave events were identified from the polarization analysis of high-resolution magnetic field data from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) onboard the Van Allen Probes. The time span is from August 2014 to June 2016, which is one complete Van Allen Probes magnetic local time (MLT) precession. For over 2,000 EMIC wave events, we have correlated their maximum wave power to the Sym-H, AE, and solar wind dynamic pressure measurements. Each EMIC wave event characterized by wave-band (H⁺-band or He⁺-band) and the intensity of each respective parameter (i.e., quiet, moderate, and disturbed activity levels). Average wave power per MLT bin and L shell is determined. Results from the data analysis reveal that more disturbed activity produces more EMIC wave activity with higher wave powers than the quiet or moderate level counterparts. Disturbed activity levels produce enhanced EMIC waves in the afternoon (1200 -1800) MLT sector and the lower L shells. Quiet and moderate activity levels generate a MLT symmetric, L = 6 EMIC wave distribution. From these respective distributions, we calculate a series of polynomial fit functions for each MLT sector under the varying levels of geomagnetic activity to produce estimates for EMIC wave power.