München 2019 – wissenschaftliches Programm
EP 9.16: Poster
Donnerstag, 21. März 2019, 16:30–19:00, Durchgangshalle
Observations of charge sign dependent modulation of galactic cosmic rays during four successive solar cycles — •Bernd Heber, Marlon Koeberle, Patrick Kuehl, and Johannes Marquardt — Christian-Albrechts-Universität, 24118 Kiel, Germany
The intensity of galactic cosmic rays (GCRs) is modulated as they traverse the turbulent magnetic field embedded in the solar wind. These particles are scattered by irregularities in the interplanetary magnetic field and undergo convection and adiabatic deceleration in the expanding solar wind. The large-scale heliospheric magnetic field leads to gradient and curvature drifts leading to charge sign dependent variations. In this contribution we investigate the time period from 1980 to 2017, including two and one solar minima during the A < 0 and A > 0 solar magnetic epoch as well as four solar magnetic field polarity reversals. Observations are taken from instruments aboard IMP-8, ISEE-3, Ulysses as well as from PAMELA and AMS-02. While the latter two separate between particle and its corresponding anti-particle the instruments utilized in this study before cannot. In order to compare these measurements with each other we utilize here the electron plus positron flux. Since the proton to antiproton ratio is smaller than 10−3 the contribution of antiprotons is neglected. The measurements by the Kiel Electron Telescope aboard Ulysses are altered by the variation along the orbit of the spacecraft that needs to be taken into account.