Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions

Sung Jun Noh; Hyomin Kim; Dogacan Ozturk; Ilya Kuzichev; Zhonghua Xu; Hui Zhang; Andrew Vu; Terry Liu; James M. Weygand; Michael D. Hartinger; Xueling Shi; Mark Engebretson; Andrew Gerrard; Eun Hwa Kim; Marc Lessard; Christopher T. Russell

doi:10.1029/2023JA031596

Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions

Sung Jun Noh, Hyomin Kim, Dogacan Ozturk, Ilya Kuzichev, Zhonghua Xu, Hui Zhang, Andrew Vu, Terry Liu, James M. Weygand, Michael D. Hartinger, Xueling Shi, Mark Engebretson, Andrew Gerrard, Eun Hwa Kim, Marc Lessard, Christopher T. Russell

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Abstract

Foreshock transient (FT) events are frequently observed phenomena that are generated by discontinuities in the solar wind. These transient events are known to trigger global-scale magnetic field perturbations (e.g., ULF waves). We report a series of FT events observed by the Magnetospheric Multiscale mission in the upstream bow shock region under quiet solar wind conditions. During the event, ground magnetometers observed significant Pc1 wave activity as well as magnetic impulse events in both hemispheres. Ground Pc1 wave observations show ∼8 min time delay (with some time differences) from each FT event which is observed at the bow shock. We also find that the ground Pc1 waves are observed earlier in the northern hemisphere compared to the southern hemisphere. The observation time difference between the hemispheres implies that the source region of the wave is the off-equatorial region.

Original language	English (US)
Article number	e2023JA031596
Journal	Journal of Geophysical Research: Space Physics
Volume	128
Issue number	9
DOIs	https://doi.org/10.1029/2023JA031596
State	Published - Sep 2023

All Science Journal Classification (ASJC) codes

Geophysics
Space and Planetary Science

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Noh, S. J., Kim, H., Ozturk, D., Kuzichev, I., Xu, Z., Zhang, H., Vu, A., Liu, T., Weygand, J. M., Hartinger, M. D., Shi, X., Engebretson, M., Gerrard, A., Kim, E. H., Lessard, M., & Russell, C. T. (2023). Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions. Journal of Geophysical Research: Space Physics, 128(9), Article e2023JA031596. https://doi.org/10.1029/2023JA031596

@article{fba35f32ba014a0cba5266c317e63d17,

title = "Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions",

abstract = "Foreshock transient (FT) events are frequently observed phenomena that are generated by discontinuities in the solar wind. These transient events are known to trigger global-scale magnetic field perturbations (e.g., ULF waves). We report a series of FT events observed by the Magnetospheric Multiscale mission in the upstream bow shock region under quiet solar wind conditions. During the event, ground magnetometers observed significant Pc1 wave activity as well as magnetic impulse events in both hemispheres. Ground Pc1 wave observations show ∼8 min time delay (with some time differences) from each FT event which is observed at the bow shock. We also find that the ground Pc1 waves are observed earlier in the northern hemisphere compared to the southern hemisphere. The observation time difference between the hemispheres implies that the source region of the wave is the off-equatorial region.",

author = "Noh, {Sung Jun} and Hyomin Kim and Dogacan Ozturk and Ilya Kuzichev and Zhonghua Xu and Hui Zhang and Andrew Vu and Terry Liu and Weygand, {James M.} and Hartinger, {Michael D.} and Xueling Shi and Mark Engebretson and Andrew Gerrard and Kim, {Eun Hwa} and Marc Lessard and Russell, {Christopher T.}",

note = "Publisher Copyright: {\textcopyright}2023. The Authors.",

year = "2023",

month = sep,

doi = "10.1029/2023JA031596",

language = "English (US)",

volume = "128",

journal = "Journal of Geophysical Research: Space Physics",

issn = "2169-9380",

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Noh, SJ, Kim, H, Ozturk, D, Kuzichev, I, Xu, Z, Zhang, H, Vu, A, Liu, T, Weygand, JM, Hartinger, MD, Shi, X, Engebretson, M, Gerrard, A, Kim, EH, Lessard, M & Russell, CT 2023, 'Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions', Journal of Geophysical Research: Space Physics, vol. 128, no. 9, e2023JA031596. https://doi.org/10.1029/2023JA031596

TY - JOUR

T1 - Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions

AU - Noh, Sung Jun

AU - Kim, Hyomin

AU - Ozturk, Dogacan

AU - Kuzichev, Ilya

AU - Xu, Zhonghua

AU - Zhang, Hui

AU - Vu, Andrew

AU - Liu, Terry

AU - Weygand, James M.

AU - Hartinger, Michael D.

AU - Shi, Xueling

AU - Engebretson, Mark

AU - Gerrard, Andrew

AU - Kim, Eun Hwa

AU - Lessard, Marc

AU - Russell, Christopher T.

PY - 2023/9

Y1 - 2023/9

N2 - Foreshock transient (FT) events are frequently observed phenomena that are generated by discontinuities in the solar wind. These transient events are known to trigger global-scale magnetic field perturbations (e.g., ULF waves). We report a series of FT events observed by the Magnetospheric Multiscale mission in the upstream bow shock region under quiet solar wind conditions. During the event, ground magnetometers observed significant Pc1 wave activity as well as magnetic impulse events in both hemispheres. Ground Pc1 wave observations show ∼8 min time delay (with some time differences) from each FT event which is observed at the bow shock. We also find that the ground Pc1 waves are observed earlier in the northern hemisphere compared to the southern hemisphere. The observation time difference between the hemispheres implies that the source region of the wave is the off-equatorial region.

AB - Foreshock transient (FT) events are frequently observed phenomena that are generated by discontinuities in the solar wind. These transient events are known to trigger global-scale magnetic field perturbations (e.g., ULF waves). We report a series of FT events observed by the Magnetospheric Multiscale mission in the upstream bow shock region under quiet solar wind conditions. During the event, ground magnetometers observed significant Pc1 wave activity as well as magnetic impulse events in both hemispheres. Ground Pc1 wave observations show ∼8 min time delay (with some time differences) from each FT event which is observed at the bow shock. We also find that the ground Pc1 waves are observed earlier in the northern hemisphere compared to the southern hemisphere. The observation time difference between the hemispheres implies that the source region of the wave is the off-equatorial region.

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JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

IS - 9

M1 - e2023JA031596

ER -

Interhemispheric Observations of ULF Waves Caused by Foreshock Transients Under Quiet Solar Wind Conditions

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