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dc.contributor.authorScherer, K.
dc.contributor.authorVan der Schyff, A.
dc.contributor.authorFerreira, S.E.S.
dc.contributor.authorStrauss, R.D.
dc.contributor.authorBomans, D.J.
dc.date.accessioned2016-08-26T06:14:53Z
dc.date.available2016-08-26T06:14:53Z
dc.date.issued2015
dc.identifier.citationScherer, K. et al. 2015. Cosmic rays in astrospheres. Astronomy & astrophysics, 576: Article no A97. [https://doi.org/10.1051/0004-6361/201425091]en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/18413
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201425091
dc.identifier.urihttp://www.aanda.org/articles/aa/full_html/2015/04/aa25091-14/aa25091-14.html
dc.description.abstractContext: Cosmic rays passing through large astrospheres can be efficiently cooled inside these “cavities” in the interstellar medium. Moreover, the energy spectra of these energetic particles are already modulated in front of the astrospherical bow shocks. Aims: We study the cosmic ray flux in and around λ Cephei as an example for an astrosphere. The large-scale plasma flow is modeled hydrodynamically with radiative cooling. Methods: We study the cosmic ray flux in a stellar wind cavity using a transport model based on stochastic differential equations. The required parameters, most importantly, the elements of the diffusion tensor, are based on the heliospheric parameters. The magnetic field required for the diffusion coefficients is calculated kinematically. We discuss the transport in an astrospheric scenario with varying parameters for the transport coefficients. Results: We show that large stellar wind cavities can act as sinks for the Galactic cosmic ray flux and thus can give rise to small-scale anisotropies in the direction to the observer. Conclusions: Small-scale cosmic ray anisotropies can naturally be explained by the modulation of cosmic ray spectra in huge stellar wind cavitiesen_US
dc.language.isoenen_US
dc.publisherEDP Sciencesen_US
dc.subjectStars: winds, outflowsen_US
dc.subjectcosmic raysen_US
dc.subjecthydrodynamicsen_US
dc.titleCosmic rays in astrospheresen_US
dc.typeArticleen_US
dc.contributor.researchID12834858 - Van der Schyff, Augusts Eric
dc.contributor.researchID10713158 - Ferreira, Stephanus Esaias Salomon
dc.contributor.researchID13065440 - Strauss, Roelf Du Toit


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