The Response of Broadband Kilometric Radiation to Compressions of the Jovian Magnetosphere

Abstract

In the planetary magnetosphere, plasma waves act as the medium for particles to transfer energy. Jupiter is the largest planet in our solar system, and the giant magnetosphere is full of energetic particles, producing intense radio emissions. When interplanetary shocks in the solar wind interact with the Jovian magnetosphere, magnetospheric conditions change, and the characteristics of Jovian radio emissions show distinct variations accordingly. This study focuses on the morphological characteristics of Jovian broadband kilometric radiation (bKOM) under different magnetospheric conditions, i.e., relaxed and compressed. Using observations from Juno, both the frequency range and duration of Jovian bKOM radio emissions are studied, and we compare their variations during compressed and relaxed magnetospheric conditions. Our results show that under compressed magnetospheric conditions, the observed frequency range of Jovian bKOM generally exceeded 100 kHz, and their duration extended from 0 to 3 hr during uncompressed conditions to about 4-9 hr. The distinct features of radio emissions under different magnetospheric conditions imply that solar wind conditions have important influences on Jovian radio emissions, and thus the radio emissions can be used as a diagnostic tool of solar wind interaction with the Jovian magnetosphere.