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Cross scale plasma processes: investigating plasma transport and acceleration across the heliosphere with OCHRE, TRACERS, Magnetospheric Multiscale and Voyager 1
Thesis   Open access

Cross scale plasma processes: investigating plasma transport and acceleration across the heliosphere with OCHRE, TRACERS, Magnetospheric Multiscale and Voyager 1

Brendan N. Powers
University of Iowa
Master of Science (MS), University of Iowa
Spring 2026
DOI: 10.25820/etd.008460
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Abstract

At the boundary between the solar wind and Earth’s magnetic field, plasma transport is achieved through two main processes. The polar cusp, a magnetic depression between the day side and nightside field lines, allows solar wind plasma direct transport to the low altitude magnetosphere and ionosphere, and supports a host of acceleration and ionospheric feedback processes. As solar wind piles up around Earth, in the nightside equatorial plasma sheet magnetic reconnection is forced. That, in turn, feeds the plasma sheet and accelerates particles towards Earth where they propagate to geosynchronous orbit and can be observed as auroral features. Beyond Earth, at a distance of approximately 120 AU, stands the heliopause; the boundary between the solar wind and the interstellar magnetic field. This interaction, also supports a variety of particle acceleration processes. The following work highlights current and ongoing attempts to characterize the plasma transport and acceleration within these regions with a variety of sounding rocket, and satellite data.

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