title: Charge exchange in cometary coma: Discovery of H-ions in the solar wind close to comet 67P/Churyumov-Gerasimenko.
abstract: As Rosetta was orbiting comet 67P/Churyumov-Gerasimenko, the Ion and Electron Sensor detected negative particles with angular distributions like those of the concurrently measured solar wind protons but with fluxes of only about 10% of the proton fluxes and energies of about 90% of the proton energies. Using well-known cross sections and energy-loss data, it is determined that the fluxes and energies of the negative particles are consistent with the production of H-ions in the solar wind by double charge exchange with molecules in the coma.
authors.affiliation: Southwest Research Institute San Antonio Texas USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Burch
authors.affiliation: Physics and Astronomy Department University of Kansas Lawrence Kansas USA.
authors.forename: T E
authors.initials: TE
authors.lastname: Cravens
authors.affiliation: Physics and Astronomy Department University of Texas at San Antonio San Antonio Texas USA.
authors.forename: K
authors.initials: K
authors.lastname: Llera
authors.affiliation: Southwest Research Institute San Antonio Texas USA.
authors.forename: R
authors.identifier: 0000-0002-7156-6402
authors.initials: R
authors.lastname: Goldstein
authors.affiliation: Southwest Research Institute San Antonio Texas USA.
authors.forename: P
authors.initials: P
authors.lastname: Mokashi
authors.affiliation: Physics Institute University of Bern Bern Switzerland.
authors.forename: C-Y
authors.initials: CY
authors.lastname: Tzou
authors.affiliation: Southwest Research Institute San Antonio Texas USA.
authors.forename: T
authors.initials: T
authors.lastname: Broiles
keywords: charge exchange; comet; solar wind