DOI

Although magnetotail bursty bulk flows (BBFs)/plasma bubbles are widely recognized as major plasma transport structures that provide particle acceleration and injection, their ionospheric signatures in energetic particles have not been established. In this study, we combine the ionospheric energetic proton flux (as a proxy to the equatorial pressure) and energetic electron loss-cone filling rate (as a marker of the equatorial magnetic field) to detect a rapid traversal from stretched to dipolarized field lines across the BBF channel. During a nonsubstorm episode when multiple flow bursts were observed in the plasma sheet, we show remarkable step-like increases of energetic proton flux (approaching 103 in some events) observed in the middle of nightside auroral zone. We also conduct a high-resolution Rice Convection Model (RCM) simulation of a plasma-sheet bubble intrusion into the inner magnetosphere. Besides confirmation of the observed signatures, the simulation illustrates variability of the ionospheric signatures of bubbles and provides guidance in future studies of flow burst interactions.

Язык оригиналаанглийский
Номер статьиe2021GL093543
Число страниц10
ЖурналGeophysical Research Letters
Том48
Номер выпуска15
DOI
СостояниеОпубликовано - 16 авг 2021

    Предметные области Scopus

  • Геофизика
  • Планетоведение и науки о земле (все)

ID: 86304809