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Related Experiment Video
Updated: Nov 23, 2025

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters
Published on: February 16, 2019
The integrated miniaturized electrostatic analyzer: A space plasma environment sensor.
G R Wilson1, C A Maldonado2, C L Enloe3
1Physics Department, University of Colorado at Colorado Springs, 1420 Austin Bluffs Pkwy, Colorado Springs, Colorado 80918, USA.
The integrated Miniaturized Electrostatic Analyzer (iMESA) successfully measured ion density, ion temperature, and spacecraft potential in Earth's ionosphere. This satellite-based sensor met all scientific mission objectives, validating its performance.
Area of Science:
- Space physics and atmospheric science
- Satellite-based remote sensing
- Ionospheric research
Background:
- The ionosphere plays a crucial role in space weather and satellite operations.
- Accurate in-situ measurements of ionospheric plasma properties are essential for scientific understanding.
- Previous instruments have provided valuable data, but continuous improvements in sensor technology are needed.
Purpose of the Study:
- To deploy and evaluate the integrated Miniaturized Electrostatic Analyzer (iMESA) on the STPSat-3 satellite.
- To measure key ionospheric parameters: plasma density, plasma temperature, and spacecraft potential.
- To assess the overall success of the iMESA scientific mission based on data quality and achievement of objectives.
Main Methods:
- The iMESA instrument utilized electrostatic analysis to measure ion current density.
- Spacecraft motion through the ionosphere enabled sampling every 10 seconds.
- Ground-based post-processing and numerical analysis of current density spectra derived plasma parameters.
Main Results:
- The iMESA instrument successfully measured ion density and ion temperature within expected ranges.
- Quantification of spacecraft potential relative to the ambient plasma potential was achieved.
- Data analysis confirmed that measured values align with existing literature predictions.
Conclusions:
- The iMESA instrument successfully met all three primary scientific objectives.
- The performance evaluation indicates a successful scientific mission for ionospheric research.
- The study validates the design and data processing of the iMESA sensor for future applications.

