Speaker
Roelf Du Toit Strauss
(NWU, ZA)
Description
In this talk I’ll give a brief introduction to the physics of cosmic ray modulation in the heliosphere and the time-dependent drivers thereof. The Parker transport equation formalism, used to model solar modulation, will also be introduced, along with a discussion regarding the necessary input parameters. A frequently applied approximation to the Parker transport equation, especially when very long-term modulation is studied, is the so-called Force-field approximation. I’ll show where this approximation originates from, what approximations are made during its derivation, why it seems to work, and what we can learn from applying this approximation to historical cosmic ray observations and proxies.
Author
Roelf Du Toit Strauss
(NWU, ZA)