Manifestations of Magnetotail Flow Channels in Energetic Particle Signatures at Low-Altitude Orbit

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Manifestations of Magnetotail Flow Channels in Energetic Particle Signatures at Low-Altitude Orbit. / Sergeev, V. A.; Sun, Weiqin; Yang, Jian; Panov, Evgeny.

In: Geophysical Research Letters, Vol. 48, No. 15, e2021GL093543, 16.08.2021.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{fdc2d874a9a24940a82b00fd93f92770,

title = "Manifestations of Magnetotail Flow Channels in Energetic Particle Signatures at Low-Altitude Orbit",

abstract = "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.",

keywords = "energetic particles, flow burst, magnetotail, plasma sheet, CONVECTION, BURSTS, MHD, MODEL, MAGNETOSPHERE, CURRENT SHEET, BUBBLES, PLASMA, PRECIPITATION, RCM-E SIMULATION",

author = "Sergeev, {V. A.} and Weiqin Sun and Jian Yang and Evgeny Panov",

year = "2021",

month = aug,

day = "16",

doi = "10.1029/2021gl093543",

language = "English",

volume = "48",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "American Geophysical Union",

number = "15",

}

RIS

TY - JOUR

T1 - Manifestations of Magnetotail Flow Channels in Energetic Particle Signatures at Low-Altitude Orbit

AU - Sergeev, V. A.

AU - Sun, Weiqin

AU - Yang, Jian

AU - Panov, Evgeny

PY - 2021/8/16

Y1 - 2021/8/16

N2 - 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.

AB - 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.

KW - energetic particles

KW - flow burst

KW - magnetotail

KW - plasma sheet

KW - CONVECTION

KW - BURSTS

KW - MHD

KW - MODEL

KW - MAGNETOSPHERE

KW - CURRENT SHEET

KW - BUBBLES

KW - PLASMA

KW - PRECIPITATION

KW - RCM-E SIMULATION

UR - http://www.scopus.com/inward/record.url?scp=85112088196&partnerID=8YFLogxK

U2 - 10.1029/2021gl093543

DO - 10.1029/2021gl093543

M3 - Article

AN - SCOPUS:85112088196

VL - 48

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 15

M1 - e2021GL093543

ER -

ID: 86304809