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July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Cosmic rays beyond the boundary of the heliosphere

Jul 31, 2015, 12:00 PM
15m
Mississippi (World Forum)

Mississippi

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution SH-TH Parallel SH 02 Outer Helio

Speaker

Vladimir Florinski

Description

In August of 2012 the Voyager 1 space probe has left the solar-wind bubble of ionized gas we call the heliosphere and entered the denser and colder environment of the interstellar cloud surrounding the solar system. Energetic charged particles underwent dramatic changes past the heliopause: the heliospheric ions disappeared completely, while the galactic cosmic rays were for the first time measured in their unmodulated state. The interstellar medium is almost entirely devoid of turbulent magnetic fluctuations, and the transport of cosmic rays is governed by a large-scale geometry of the magnetic field. We discuss observations of heliospheric ions, including anomalous cosmic rays, near the heliopause transition, and propose interpretations of the measured intensities and pitch-angle distributions based on gradient drift in a weakly nonuniform magnetic field. The heliopause transition appears to be permeated by magnetic flux tubes connected to the interstellar space and facilitating particle escape. The two Flux tube crossings by the spacecraft allowed an indirect measurement of the plasma radial velocity near the heliopause. We also discuss galactic cosmic ray transport properties and their anisotropies in the outer heliosheath.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 948

Primary author

Co-authors

Alan Cummings (California Institute of Technology) Edward Stone (California Institute of Technology) Jakobus le Roux (University of Alabama, Huntsville)

Presentation materials

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