Constraining the Charge-Sign and Rigidity-Dependence of Solar Modulation. (arXiv:2007.00669v1 [astro-ph.HE])

Constraining the Charge-Sign and Rigidity-Dependence of Solar Modulation. (arXiv:2007.00669v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Cholis_I/0/1/0/all/0/1">Ilias Cholis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hooper_D/0/1/0/all/0/1">Dan Hooper</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Linden_T/0/1/0/all/0/1">Tim Linden</a>

Our ability to identify the sources of cosmic rays and understand how these
particles propagate through the interstellar medium is hindered by the combined
effects of the solar wind and its embedded magnetic field, collectively known
as solar modulation. In this paper, we build upon our previous work to model
and constrain the effects of solar modulation on the cosmic-ray spectrum, using
data from AMS-02 and BESS Polar II collected between 2007 and 2012, during
which the heliospheric magnetic field was in a state of negative polarity. Our
model uses measurements of the heliospheric magnetic field and the tilt angle
of the heliospheric current sheet to accurately predict the effects of solar
modulation as a function of time, charge, and rigidity. By incorporating data
from a period of negative polarity, we have been able to robustly observe and
constrain the charge-dependent effects of solar modulation.

Our ability to identify the sources of cosmic rays and understand how these
particles propagate through the interstellar medium is hindered by the combined
effects of the solar wind and its embedded magnetic field, collectively known
as solar modulation. In this paper, we build upon our previous work to model
and constrain the effects of solar modulation on the cosmic-ray spectrum, using
data from AMS-02 and BESS Polar II collected between 2007 and 2012, during
which the heliospheric magnetic field was in a state of negative polarity. Our
model uses measurements of the heliospheric magnetic field and the tilt angle
of the heliospheric current sheet to accurately predict the effects of solar
modulation as a function of time, charge, and rigidity. By incorporating data
from a period of negative polarity, we have been able to robustly observe and
constrain the charge-dependent effects of solar modulation.

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