# THEMIS-E

> satellite in the THEMIS constellation

**Wikidata**: [Q111497119](https://www.wikidata.org/wiki/Q111497119)  
**Source**: https://4ort.xyz/entity/themis-e

## Summary
THEMIS-E is a geomagnetic satellite launched as part of NASA's THEMIS constellation in 2007. It was designed to study Earth's magnetosphere and related regions, contributing to the exploration of space weather phenomena. The satellite was built by Swales Aerospace and operated by NASA.

## Key Facts
- **Class**: Geomagnetic satellite designed to monitor Earth's magnetosphere and related regions
- **Launch Date**: February 17, 2007, at 23:01:00 UTC from Cape Canaveral Space Launch Complex 17B
- **Launch Vehicle**: Delta II (D-323 configuration)
- **Operator**: National Aeronautics and Space Administration (NASA)
- **Manufacturer**: Swales Aerospace (general contractor), University of California, Berkeley (subcontractor for instruments and system integration)
- **Mass**: 77 kg (dry weight), 126 kg (launch weight)
- **Dimensions**: 51 cm height, 84 cm diameter
- **Power System**: Spacecraft solar array with 37 watts capacity, reaction control system using hydrazine
- **Aliases**: Explorer 89, THEMIS-P4, MIDEX-5E, Эксплорер-89
- **Part of**: THEMIS constellation
- **Preceded/Succeeded by**: Aeronomy of Ice in the Mesosphere (AIM) satellite
- **Country of Origin**: United States

## FAQs
### Q: What was the primary mission of THEMIS-E?
A: THEMIS-E was part of NASA's THEMIS constellation, designed to study Earth's magnetosphere and related regions, particularly focusing on space weather phenomena.

### Q: Who built THEMIS-E, and who operated it?
A: THEMIS-E was built by Swales Aerospace (general contractor) and the University of California, Berkeley (subcontractor for instruments and system integration). It was operated by NASA.

### Q: What launch vehicle was used to deploy THEMIS-E?
A: THEMIS-E was launched on a Delta II rocket in the D-323 configuration.

### Q: What are the key dimensions of THEMIS-E?
A: THEMIS-E has a height of 51 cm and a diameter of 84 cm.

### Q: What power system does THEMIS-E use?
A: THEMIS-E is powered by a spacecraft solar array with a capacity of 37 watts and a reaction control system using hydrazine.

## Why It Matters
THEMIS-E played a crucial role in NASA's THEMIS mission, which aimed to understand the processes that transfer energy from the solar wind into Earth's magnetosphere. By studying geomagnetic substorms and their effects on space weather, THEMIS-E contributed to improving our understanding of space weather phenomena, which can impact satellite operations, communication systems, and power grids on Earth. The mission provided valuable data on the dynamics of Earth's magnetosphere, helping scientists develop better models for predicting space weather events. THEMIS-E's findings have been instrumental in advancing space weather research and enhancing our ability to mitigate the effects of geomagnetic storms.

## Notable For
- **Part of the THEMIS Constellation**: THEMIS-E was one of five satellites launched as part of NASA's THEMIS mission, designed to study Earth's magnetosphere.
- **Geomagnetic Satellite**: THEMIS-E was specifically designed to monitor Earth's magnetosphere and related regions, contributing to space weather research.
- **Delta II Launch**: THEMIS-E was launched using a Delta II rocket, a retired expendable launch system in the Delta rocket family.
- **Collaborative Development**: THEMIS-E was developed in collaboration between Swales Aerospace and the University of California, Berkeley, with NASA overseeing the mission.
- **Space Weather Research**: THEMIS-E's data has been used to improve our understanding of geomagnetic substorms and their impact on space weather.

## Body
### Mission Overview
THEMIS-E was launched as part of NASA's Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission, which aimed to study the processes that transfer energy from the solar wind into Earth's magnetosphere. The mission involved five identical satellites, each equipped with comprehensive instrumentation to measure magnetic fields, electric fields, plasma waves, and particles.

### Technical Specifications
- **Mass**: THEMIS-E had a dry mass of 77 kg and a launch mass of 126 kg.
- **Dimensions**: The satellite had a height of 51 cm and a diameter of 84 cm.
- **Power System**: THEMIS-E was powered by a spacecraft solar array with a capacity of 37 watts and a reaction control system using hydrazine.
- **Launch Details**: THEMIS-E was launched on February 17, 2007, at 23:01:00 UTC from Cape Canaveral Space Launch Complex 17B using a Delta II rocket in the D-323 configuration.

### Development and Operation
- **Manufacturer**: Swales Aerospace served as the general contractor for THEMIS-E, while the University of California, Berkeley, acted as a subcontractor for the spacecraft's instruments and system integration.
- **Operator**: NASA operated THEMIS-E as part of the THEMIS mission.
- **Launch Contractor**: United Launch Alliance was responsible for the launch of THEMIS-E.

### Significance
THEMIS-E's data has been crucial in advancing our understanding of geomagnetic substorms and their impact on space weather. The mission's findings have contributed to improving models for predicting space weather events, which can affect satellite operations, communication systems, and power grids on Earth.

## Schema Markup
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  "@type": "Thing",
  "name": "THEMIS-E",
  "description": "A geomagnetic satellite launched as part of NASA's THEMIS constellation in 2007 to study Earth's magnetosphere and related regions.",
  "additionalType": "Satellite",
  "manufacturer": {
    "@type": "Organization",
    "name": "Swales Aerospace"
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  "operator": {
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    "name": "National Aeronautics and Space Administration"
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  "launchDate": "2007-02-17",
  "launchVehicle": "Delta II",
  "countryOfOrigin": "United States"
}

## References

1. [Source](http://www.swales.com/spacecraft/themis.html)
2. [Source](https://www.nasaspaceflight.com/2007/02/ulas-delta-ii-launches-with-themis/)
3. Jonathan's Space Report
4. [Source](https://directory.eoportal.org/web/eoportal/satellite-missions/t/themis#spacecraft)
5. [Source](https://directory.eoportal.org/web/eoportal/satellite-missions/t/themis)