TY - JOUR

T1 - Reply to “Comment on ‘‘Unraveling the Role of IMF Bx in Driving Geomagnetic Activity’’” by Lauri Holappa et al.

AU - Кубышкина, Марина Валерьевна

AU - Семенов, Владимир Семенович

AU - Цыганенко, Николай Алексеевич

AU - Wang, Xiaogang

AU - Кубышкин, Игорь Валерьевич

PY - 2023/10/1

Y1 - 2023/10/1

N2 - We thank Lauri Holappa, Jone Peter Reistad and Anders Ohma for their interest in our research and for having published their comments, referred hereafter as HEA2023. Here we present our counterarguments to the points presented in HEA2023. We explain the observed excess of AL values for different polarities of IMF By over different IMF Bx polarities by an additional negative IMF Bz, which exist due to the 7.25-degree tilt of the solar equatorial plane to the ecliptic plane. We emphasize again that the AL index strongly depends on the dipole tilt, so that under the same driving conditions is more than twice larger during non-tilted dipole periods than at solstices. The IMF Bx component, depending on its polarity, moves the magnetotail plasma sheet away from or toward the equatorial plane, and thus changes the effective dipole tilt angle. That change may be a cause of the asymmetric response of the AL-index to positive or negative values of the IMF Bx.

AB - We thank Lauri Holappa, Jone Peter Reistad and Anders Ohma for their interest in our research and for having published their comments, referred hereafter as HEA2023. Here we present our counterarguments to the points presented in HEA2023. We explain the observed excess of AL values for different polarities of IMF By over different IMF Bx polarities by an additional negative IMF Bz, which exist due to the 7.25-degree tilt of the solar equatorial plane to the ecliptic plane. We emphasize again that the AL index strongly depends on the dipole tilt, so that under the same driving conditions is more than twice larger during non-tilted dipole periods than at solstices. The IMF Bx component, depending on its polarity, moves the magnetotail plasma sheet away from or toward the equatorial plane, and thus changes the effective dipole tilt angle. That change may be a cause of the asymmetric response of the AL-index to positive or negative values of the IMF Bx.

KW - interplanetary magnetic field

KW - magnetospheric activity

KW - magnetospheric configuration

KW - magnetospheric indices

KW - solar wind-magnetosphere interaction

UR - https://www.mendeley.com/catalogue/68535dd6-296d-3a92-be80-6549d76ba121/

U2 - 10.1029/2023ja031894

DO - 10.1029/2023ja031894

M3 - Article

VL - 128

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 10

M1 - e2023JA031894

ER -