ANALYSIS OF INTERNATIONAL SPACE STATION PLASMA INTERACTION (PLASMA
INTERACTION MODEL)
Research Area: Technology Development and Demonstration: Spacecraft and
Orbital Environments
Expedition(s): 16, 18-20, 29, 30
Principal Investigator(s): ● Ronald R. Mikatarian, Boeing, Houston, Texas
RESEARCH OBJECTIVES
This analysis created a model to predict the voltage difference between the International Space
Station (ISS) and the plasma background. The ionospheric plasma interacts with the ISS solar
arrays and conducting surfaces, causing excess charge to be accumulated, thus creating the
potential difference. This model will be used to predict the ISS floating potentials to assess
vehicle and extravehicular mobility unit dielectric breakdown.
EARTH BENEFITS
This model will be the standard for solar arrays in space. With an energy crisis upon us, solar
power is a viable alternative. Ultimately, solar arrays in space create more power than solar
arrays on the ground. This model will be invaluable for those seeking to pioneer solar arrays in
space for the private sector.
SPACE BENEFITS
This Plasma Interaction Model models the interaction of the spacecraft, with high-voltage solar
arrays, to the local plasma environment.
RESULTS
The Plasma Interaction Model has been used to predict the charge build-up and associated
dangers for future ISS solar array configurations. Ground data were collected from various
locations around the world. Additionally, historical data—eg, the IRI 2001 model, FPP data, and
the Dynamics Explorer-2 Satellite data, are available. Using these data, the PIM has been able
to characterize the peak voltage levels for the various ISS stage builds. (Reddell 2006).
PUBLICATION(S)
Reddell B, Alred J, Kramer L, Mikatarian RR, Minow J, Koontz S. Analysis of ISS plasma
interaction. 44th Aerospace Sciences Meeting and Exhibit. Reno, NV; January 9-12, 2006.
This investigation is complete; however additional results are pending publication.