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Dive into the research topics where Emily M. Willis is active.

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Featured researches published by Emily M. Willis.


AIAA SPACE 2016 | 2016

Observations of Transient ISS Floating Potential Variations during High Voltage Solar Array Operations

Emily M. Willis; Joseph I. Minow; Linda N. Parker; Maria Z. A. Pour; Charles Merrill Swenson; Ken-ichi Nishikawa; Linda Krause

The International Space Station (ISS) continues to be a world-class space research laboratory after over 15 years of operations, and it has proven to be a fantastic resource for observing spacecraft floating potential variations related to high voltage solar array operations in Low Earth Orbit (LEO). Measurements of the ionospheric electron density and temperature along the ISS orbit and variations in the ISS floating potential are obtained from the Floating Potential Measurement Unit (FPMU). In particular, rapid variations in ISS floating potential during solar array operations on time scales of tens of milliseconds can be recorded due to the 128 Hz sample rate of the Floating Potential Probe (FPP) pro- viding interesting insight into high voltage solar array interaction with the space plasma environment. Comparing the FPMU data with the ISS operations timeline and solar array data provides a means for correlating some of the more complex and interesting transient floating potential variations with mission operations. These complex variations are not reproduced by current models and require further study to understand the underlying physical processes. In this paper we present some of the floating potential transients observed over the past few years along with the relevant space environment parameters and solar array operations data.


Journal of Spacecraft and Rockets | 2017

Transient Floating Potential Variations Attributed to High-Voltage Solar Array Operations

Emily M. Willis; Joseph I. Minow; Maria Z. A. Pour; Ken-ichi Nishikawa; Charles Merrill Swenson

The International Space Station continues to be a productive space research laboratory after over 15 years of operations, and it has proven to be a valuable resource for observing spacecraft floati...


Archive | 2014

Characteristics of Extreme Auroral Charging Events

Joseph I. Minow; Emily M. Willis; Linda Neergard Parker


IEEE Transactions on Plasma Science | 2018

A New Model for Plasma Interactions With High-Voltage Solar Arrays on the International Space Station

Emily M. Willis; Maria Z. A. Pour


Archive | 2017

Temporal Evolution of the Plasma Sheath Surrounding Solar Cells in Low Earth Orbit

Emily M. Willis; Maria Z. A. Pour


Archive | 2016

iSat Surface Charging and Thruster Plume Interactions Analysis

L. Neergaard Parker; Emily M. Willis; Joseph I. Minow


Archive | 2016

Spacecraft Charging Current Balance Model Applied to High Voltage Solar Array Operations

Emily M. Willis; Maria Z. A. Pour


Archive | 2014

Correlation of ISS Electric Potential Variations with Mission Operations

Emily M. Willis; Joseph I. Minow; Linda N. Parker


Archive | 2014

Natural Environment Capabilities at MSFC

Linda N. Parker; Emily M. Willis; Joseph I. Minow


Archive | 2014

Spacecraft Charging Analysis of a CubeSat

Emily M. Willis; Joseph I. Minow; Linda N. Parker

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Joseph I. Minow

Marshall Space Flight Center

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Maria Z. A. Pour

University of Alabama in Huntsville

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Albert C. Whittlesey

California Institute of Technology

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Edward J. Wollack

Goddard Space Flight Center

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Ira Katz

National Oceanic and Atmospheric Administration

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Kenneth H. Wright

University of Alabama in Huntsville

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Todd A. Schneider

Marshall Space Flight Center

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Antti Pulkkinen

Goddard Space Flight Center

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