Magnetotail configurations during ballooning-interchange instability signatures

In situ observations revealed both linear and non-linear signatures of the kinetic (electron) ballooning-interchange instability (BICI) operating in the Earth’s magnetotail, which appear to drive auroral beads and pseudo-breakups in the ionosphere. Observation of the magnetotail configurations with inversed gradient of the vertical magnetic field, which is believed to drive the BICI is challenged by sparse spacecraft coverage. We use the adapted modeling based on in situ spacecraft observations, and low-altitude particle observations to extract some information on such magnetotail configurations. We present two in situ events with both linear and non-linear BICI development signatures and compare the magnetotail configurations during the two events using the two methods.