Signal propagation time from the magnetotail to the ionosphere: OpenGGCM simulation

Abstract

AbstractDistinguishing the processes that occur during the first 2 min of a substorm depends critically on the correct timing of different signals between the plasma sheet and the ionosphere. To investigate signal propagation paths and signal travel times, we use a magnetohydrodynamic global simulation model of the Earth magnetosphere and ionosphere, OpenGGCM‐CTIM model. By creating single impulse or sinusoidal pulsations in various locations in the magnetotail, the waves are launched, and we investigate the paths taken by the waves and the time that different waves take to reach the ionosphere. We find that it takes approximately about 27, 36, 45, 60, and 72 s for waves to travel from the tail plasma sheet at x =− 10,−15,−20,−25, and −30RE, respectively, to the ionosphere, contrary to previous reports. We also find that waves originating in the plasma sheet generally travel faster through the lobes than through the plasma sheet.