Unraveling the Role of IMF Bx in Driving Geomagnetic Activity

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Unraveling the Role of IMF Bx in Driving Geomagnetic Activity. / Kubyshkina, M. V.; Semenov, V. S.; Tsyganenko, N. A.; Wang, X.-G.; Kubyshkin, I. V.

In: Journal of Geophysical Research: Space Physics, Vol. 128, No. 4, e2022JA031275, 24.04.2023.

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

BibTeX

@article{29d3a1f5c50d4b84ae22fa26eb7b68d0,

title = "Unraveling the Role of IMF Bx in Driving Geomagnetic Activity",

abstract = "In this work, we question the existing opinion that the interplanetary magnetic field (IMF) Sun-Earth (Bx) component is of minor importance for the geomagnetic activity and show that both Bx and By, being two principal components of the Parker's spiral, are equally important factors. We show that the asymmetric behavior of activity indices around solstices can be explained as a combination of symmetric (sign-independent) effect of IMF By and asymmetric (sign-dependent) effect of Bx, the latter interpreted as a result of the geodipole tilt influence on the magnetotail stability and nightside reconnection. We also show that, due to the 7.5° inclination of the Earth orbital plane to the solar equatorial plane, the geoeffective IMF Bz component may increase or decrease, depending on the IMF sector polarity and season.",

keywords = "auroral indices, magnetosphere, plasma sheet, solar wind, substorm activity",

author = "Kubyshkina, {M. V.} and Semenov, {V. S.} and Tsyganenko, {N. A.} and X.-G. Wang and Kubyshkin, {I. V.}",

year = "2023",

month = apr,

day = "24",

doi = "10.1029/2022ja031275",

language = "English",

volume = "128",

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

issn = "2169-9380",

publisher = "Wiley-Blackwell",

number = "4",

}

RIS

TY - JOUR

T1 - Unraveling the Role of IMF Bx in Driving Geomagnetic Activity

AU - Kubyshkina, M. V.

AU - Semenov, V. S.

AU - Tsyganenko, N. A.

AU - Wang, X.-G.

AU - Kubyshkin, I. V.

PY - 2023/4/24

Y1 - 2023/4/24

N2 - In this work, we question the existing opinion that the interplanetary magnetic field (IMF) Sun-Earth (Bx) component is of minor importance for the geomagnetic activity and show that both Bx and By, being two principal components of the Parker's spiral, are equally important factors. We show that the asymmetric behavior of activity indices around solstices can be explained as a combination of symmetric (sign-independent) effect of IMF By and asymmetric (sign-dependent) effect of Bx, the latter interpreted as a result of the geodipole tilt influence on the magnetotail stability and nightside reconnection. We also show that, due to the 7.5° inclination of the Earth orbital plane to the solar equatorial plane, the geoeffective IMF Bz component may increase or decrease, depending on the IMF sector polarity and season.

AB - In this work, we question the existing opinion that the interplanetary magnetic field (IMF) Sun-Earth (Bx) component is of minor importance for the geomagnetic activity and show that both Bx and By, being two principal components of the Parker's spiral, are equally important factors. We show that the asymmetric behavior of activity indices around solstices can be explained as a combination of symmetric (sign-independent) effect of IMF By and asymmetric (sign-dependent) effect of Bx, the latter interpreted as a result of the geodipole tilt influence on the magnetotail stability and nightside reconnection. We also show that, due to the 7.5° inclination of the Earth orbital plane to the solar equatorial plane, the geoeffective IMF Bz component may increase or decrease, depending on the IMF sector polarity and season.

KW - auroral indices

KW - magnetosphere

KW - plasma sheet

KW - solar wind

KW - substorm activity

UR - https://www.mendeley.com/catalogue/c6a9e057-b162-34ed-b949-30c2d32daff9/

U2 - 10.1029/2022ja031275

DO - 10.1029/2022ja031275

M3 - Article

VL - 128

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 4

M1 - e2022JA031275

ER -

ID: 104595289