Projekteja vuodessa
Abstrakti
We study the solar wind interaction with Mercury using a global three-dimensional hybrid model. In the analysed simulation run, we find a well-developed, dynamic Hermean ion foreshock ahead of the quasi-parallel bow shock under upstream solar wind and interplanetary magnetic field (IMF) conditions corresponding to the orbital perihelion of the planet. A portion of the incident solar wind ion flux is scattered back upstream near the quasi-parallel bow shock including both major solar wind ion species, protons and alphas. The scattered particles form the Hermean suprathermal foreshock ion population. A significant part of the suprathermal population is backstreaming with a velocity component towards the Sun in the near-foreshock at the planetocentric distance of few planetary radii in the plane of the IMF. The ion foreshock is associated with large-scale, oblique fast magnetosonic waves in the ultra-low-frequency (ULF) range convecting downstream with the solar wind. The ULF wave period is about 5 s in the analysed upstream condition case at Mercury, which corresponds to the 30-s foreshock waves at Earth when scaled by the IMF magnitude.
Alkuperäiskieli | Englanti |
---|---|
Sivut | 4147-4161 |
Sivumäärä | 15 |
Julkaisu | Monthly Notices of the Royal Astronomical Society |
Vuosikerta | 491 |
Numero | 3 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 1 tammik. 2020 |
OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Sormenjälki
Sukella tutkimusaiheisiin 'Ultra-low frequency waves in the ion foreshock of Mercury: A global hybrid modeling study'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Projektit
- 1 Päättynyt
-
Shokit ja turbulentit välivyöhykkeet heliosfäärissä
Pulkkinen, T. (Vastuullinen tutkija)
01/09/2017 → 31/08/2022
Projekti: Academy of Finland: Other research funding