12 Feb 2021

12 Feb 2021

Review status: this preprint is currently under review for the journal ANGEO.

Io's auroral emissions via global hybrid plasma simulations

Štěpán Štverák1,2, Pavel Trávníček3, Ondřej Šebek1, and David Herčík1 Štěpán Štverák et al.
  • 1Institute of Atmospheric Physics, CAS, Prague, Czech Republic
  • 2Astronomical Institute, CAS, Ond ˇ rejov, Czech Republic
  • 3Space Sciences Laboratory, UCB, Berkeley, CA, USA

Abstract. We tackle the Io's aurora source and topology by carrying out a set of global hybrid simulations of Io's interaction with the plasma torus under different model geometry and background conditions. Based on the simulated results, we compute the photon emission rates above the Io's surface and present the resulting images from a virtual telescope and topological maps showing the distribution of the emission sources across the moon's surface. This allows us to compare the structure of the aurora with the real observations and conclude on the different assumptions. We found a reasonable agreement with the real observations in the case of non-collisional background electron populations. From the comparison of the local magnetic field topology with model aurora structures, we also infer that an induced dipole feature is more probable to play a role in the interaction of Io with the Jovian magnetosphere. In addition we also examine the potential contribution of energetic electron beams, being observed in the Io's wake region, to the overall auroral emissions.

Štěpán Štverák et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2021-10', Anonymous Referee #1, 23 Feb 2021
  • RC2: 'Comment on angeo-2021-10', Anonymous Referee #2, 14 Apr 2021

Štěpán Štverák et al.

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Io hybrid simulations Štěpán Štverák

Štěpán Štverák et al.


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Short summary
We present a study of Io's aurora patters based on global numerical simulations of the moon's interaction with the Jovian magnetospheric plasma torus. We demonstrate how different configurations of plasma interactions with the neutral atmosphere affect the resulting aurora's morphology. Comparison to real remote observations indicate existence of Io's induced magnetic dipole and low collisionality of thermal electrons. The conducted research was supported by Czech Science Foundation.