Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances

Y. Nishimura; S. R. Zhang; L. R. Lyons; Y. Deng; A. J. Coster; J. I. Moen; L. B. Clausen; W. A. Bristow; N. Nishitani

doi:10.1029/2020GL089451

Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances

Y. Nishimura, S. R. Zhang, L. R. Lyons, Y. Deng, A. J. Coster, J. I. Moen, L. B. Clausen, W. A. Bristow, N. Nishitani

Meteorology and Atmospheric Science

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3 Scopus citations

Abstract

We examined the source region of dayside large-scale traveling ionospheric disturbances (LSTIDs) and their relation to cusp energy input. Aurora and total electron content (TEC) observations show that LSTIDs propagate equatorward away from the cusp and demonstrate the cusp region as the source region. Enhanced energy input to the cusp initiated by interplanetary magnetic field (IMF) southward turning triggers the LSTIDs, and each LSTID oscillation is correlated with a TEC enhancement in the dayside oval with tens of minutes periodicity. Equatorward-propagating LSTIDs are likely gravity waves caused by repetitive heating in the cusp. The cusp source can explain the high LSTID occurrence on the dayside during geomagnetically active times. Poleward-propagating ΔTEC patterns in the polar cap propagate nearly at the convection speed. While they have similar ΔTEC signatures to gravity wave-driven LSTIDs, they are suggested to be weak polar cap patches quasiperiodically drifting from the cusp into the polar cap via dayside reconnection.

Original language	English (US)
Article number	e2020GL089451
Journal	Geophysical Research Letters
Volume	47
Issue number	19
DOIs	https://doi.org/10.1029/2020GL089451
State	Published - Oct 16 2020

All Science Journal Classification (ASJC) codes

Geophysics
Earth and Planetary Sciences(all)

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10.1029/2020GL089451

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@article{ff2c7fcd4bbb44bc95aef00ff3334739,

title = "Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances",

abstract = "We examined the source region of dayside large-scale traveling ionospheric disturbances (LSTIDs) and their relation to cusp energy input. Aurora and total electron content (TEC) observations show that LSTIDs propagate equatorward away from the cusp and demonstrate the cusp region as the source region. Enhanced energy input to the cusp initiated by interplanetary magnetic field (IMF) southward turning triggers the LSTIDs, and each LSTID oscillation is correlated with a TEC enhancement in the dayside oval with tens of minutes periodicity. Equatorward-propagating LSTIDs are likely gravity waves caused by repetitive heating in the cusp. The cusp source can explain the high LSTID occurrence on the dayside during geomagnetically active times. Poleward-propagating ΔTEC patterns in the polar cap propagate nearly at the convection speed. While they have similar ΔTEC signatures to gravity wave-driven LSTIDs, they are suggested to be weak polar cap patches quasiperiodically drifting from the cusp into the polar cap via dayside reconnection.",

author = "Y. Nishimura and Zhang, {S. R.} and Lyons, {L. R.} and Y. Deng and Coster, {A. J.} and Moen, {J. I.} and Clausen, {L. B.} and Bristow, {W. A.} and N. Nishitani",

note = "Funding Information: This work was supported by NASA NNX17AL22G, 80NSSC18K0657 and 80NSSC20K0604, NSF AGS‐1907698 and AGS‐1762141, and AFOSR FA9559‐16‐1‐0364. J. I. M. and L. B. N. C. acknowledge support by Research Council of Norway Grant 275653. We thank support from the CEDAR workshop “Grand Challenge: Multi scale I‐T system dynamics” and ISSI workshops “Multiple‐instrument observations and simulations of the dynamical processes associated with polar cap patches/aurora and their associated scintillations” and “Multi‐Scale Magnetosphere‐Ionosphere‐Thermosphere Interaction.” Publisher Copyright: {\textcopyright}2020. American Geophysical Union. All Rights Reserved.",

year = "2020",

month = oct,

day = "16",

doi = "10.1029/2020GL089451",

language = "English (US)",

volume = "47",

journal = "Geophysical Research Letters",

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T1 - Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances

AU - Nishimura, Y.

AU - Zhang, S. R.

AU - Lyons, L. R.

AU - Deng, Y.

AU - Coster, A. J.

AU - Moen, J. I.

AU - Clausen, L. B.

AU - Bristow, W. A.

AU - Nishitani, N.

N1 - Funding Information: This work was supported by NASA NNX17AL22G, 80NSSC18K0657 and 80NSSC20K0604, NSF AGS‐1907698 and AGS‐1762141, and AFOSR FA9559‐16‐1‐0364. J. I. M. and L. B. N. C. acknowledge support by Research Council of Norway Grant 275653. We thank support from the CEDAR workshop “Grand Challenge: Multi scale I‐T system dynamics” and ISSI workshops “Multiple‐instrument observations and simulations of the dynamical processes associated with polar cap patches/aurora and their associated scintillations” and “Multi‐Scale Magnetosphere‐Ionosphere‐Thermosphere Interaction.” Publisher Copyright: ©2020. American Geophysical Union. All Rights Reserved.

PY - 2020/10/16

Y1 - 2020/10/16

N2 - We examined the source region of dayside large-scale traveling ionospheric disturbances (LSTIDs) and their relation to cusp energy input. Aurora and total electron content (TEC) observations show that LSTIDs propagate equatorward away from the cusp and demonstrate the cusp region as the source region. Enhanced energy input to the cusp initiated by interplanetary magnetic field (IMF) southward turning triggers the LSTIDs, and each LSTID oscillation is correlated with a TEC enhancement in the dayside oval with tens of minutes periodicity. Equatorward-propagating LSTIDs are likely gravity waves caused by repetitive heating in the cusp. The cusp source can explain the high LSTID occurrence on the dayside during geomagnetically active times. Poleward-propagating ΔTEC patterns in the polar cap propagate nearly at the convection speed. While they have similar ΔTEC signatures to gravity wave-driven LSTIDs, they are suggested to be weak polar cap patches quasiperiodically drifting from the cusp into the polar cap via dayside reconnection.

AB - We examined the source region of dayside large-scale traveling ionospheric disturbances (LSTIDs) and their relation to cusp energy input. Aurora and total electron content (TEC) observations show that LSTIDs propagate equatorward away from the cusp and demonstrate the cusp region as the source region. Enhanced energy input to the cusp initiated by interplanetary magnetic field (IMF) southward turning triggers the LSTIDs, and each LSTID oscillation is correlated with a TEC enhancement in the dayside oval with tens of minutes periodicity. Equatorward-propagating LSTIDs are likely gravity waves caused by repetitive heating in the cusp. The cusp source can explain the high LSTID occurrence on the dayside during geomagnetically active times. Poleward-propagating ΔTEC patterns in the polar cap propagate nearly at the convection speed. While they have similar ΔTEC signatures to gravity wave-driven LSTIDs, they are suggested to be weak polar cap patches quasiperiodically drifting from the cusp into the polar cap via dayside reconnection.

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U2 - 10.1029/2020GL089451

DO - 10.1029/2020GL089451

M3 - Article

AN - SCOPUS:85092438754

SN - 0094-8276

VL - 47

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 19

M1 - e2020GL089451

ER -

Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances

Abstract

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