Transmission of foreshock waves through Earth’s bow shock

0565946 - ÚFA 2024 RIV GB eng J - Journal Article
Turc, L. - Roberts, O. W. - Verscharen, D. - Dimmock, A.P. - Kajdic, P. - Palmroth, M. - Pfau-Kempf, Y. - Johlander, A. - Dubart, M. - Kilpua, E. K. J. - Souček, Jan - Takahashi, K. - Takahashi, N. - Battarbee, M. - Ganse, U.
Transmission of foreshock waves through Earth’s bow shock.
Nature Physics. Roč. 19, č. 1 (2023), s. 78-86. ISSN 1745-2473. E-ISSN 1745-2481
Institutional support: RVO:68378289
Keywords : quasi-parallel shocks * low-frequency waves * solar-wind * upstream * pulsations * propagation * simulation * magnetosheath
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 19.5, year: 2022
Method of publishing: Open access
https://www.nature.com/articles/s41567-022-01837-z

The Earth’s magnetosphere and its bow shock, which is formed by the interaction of the supersonic solar wind with the terrestrial magnetic field, constitute a rich natural laboratory enabling in situ investigations of universal plasma processes. Under suitable interplanetary magnetic field conditions, a foreshock with intense wave activity forms upstream of the bow shock. So-called 30 s waves, named after their typical period at Earth, are the dominant wave mode in the foreshock and play an important role in modulating the shape of the shock front and affect particle reflection at the shock. These waves are also observed inside the magnetosphere and down to the Earth’s surface, but how they are transmitted through the bow shock remains unknown. By combining state-of-the-art global numerical simulations and spacecraft observations, we demonstrate that the interaction of foreshock waves with the shock generates earthward-propagating, fast-mode waves, which reach the magnetosphere. These findings give crucial insight into the interaction of waves with collisionless shocks in general and their impact on the downstream medium.
Permanent Link: https://hdl.handle.net/11104/0337432