# Magnetospheric Multiscale 4

> spacecraft in the Magnetospheric Multiscale constellation

**Wikidata**: [Q113274851](https://www.wikidata.org/wiki/Q113274851)  
**Source**: https://4ort.xyz/entity/magnetospheric-multiscale-4

## Summary
Magnetospheric Multiscale 4 (MMS4) is a spacecraft in NASA's Magnetospheric Multiscale Mission constellation, designed to study Earth's magnetosphere. Launched on March 13, 2015, it is part of a four-satellite formation that measures magnetic reconnection events in space. MMS4 operates in a highly elliptical orbit, contributing to NASA's solar-terrestrial research.

## Key Facts
- **Part of the Magnetospheric Multiscale Mission**, a NASA constellation of four satellites.
- **Launched on March 13, 2015**, at 02:44 UTC from Cape Canaveral Space Launch Complex 41.
- **Operated by the National Aeronautics and Space Administration (NASA)**.
- **Launched aboard an Atlas V 421 rocket**, flight designation AV-053.
- **Orbits Earth in a highly elliptical orbit**, part of a formation to study magnetic reconnection.
- **Has the COSPAR ID 2015-011D** and NSSDCA ID 2015-011D.
- **Nicknamed "Ringo"** among the MMS satellites.
- **Designed as a geomagnetic satellite**, focusing on Earth's magnetosphere.
- **Operates alongside MMS1, MMS2, and MMS3** in a coordinated mission.

## FAQs
### Q: What is the purpose of Magnetospheric Multiscale 4?
A: MMS4 is part of NASA's Magnetospheric Multiscale Mission, which studies magnetic reconnection events in Earth's magnetosphere. The four satellites work together to measure plasma dynamics and magnetic field interactions.

### Q: When was Magnetospheric Multiscale 4 launched?
A: MMS4 was launched on March 13, 2015, at 02:44 UTC from Cape Canaveral Space Launch Complex 41.

### Q: What launch vehicle carried Magnetospheric Multiscale 4?
A: MMS4 was launched aboard an Atlas V 421 rocket, designated AV-053 by United Launch Alliance.

### Q: How does Magnetospheric Multiscale 4 differ from other MMS satellites?
A: While all four MMS satellites have identical instruments and operate in formation, each is individually named (MMS1, MMS2, MMS3, MMS4) and may have slight variations in orbit or operational focus.

### Q: What is the significance of the "Ringo" nickname?
A: The nickname "Ringo" is one of the four MMS satellites' informal names, referencing the Beatles member. The other satellites are named "John," "Paul," and "George."

## Why It Matters
Magnetospheric Multiscale 4 plays a critical role in NASA's Magnetospheric Multiscale Mission, which aims to unravel the mysteries of magnetic reconnection—one of the most fundamental energy conversion processes in the universe. By studying how magnetic fields around Earth interact with solar wind, the mission helps scientists understand space weather, which can disrupt satellites, power grids, and communication systems. The four-satellite formation allows for high-resolution measurements of plasma dynamics, providing unprecedented insights into how magnetic energy is released and transferred in space. This research not only advances our understanding of Earth's magnetosphere but also has broader implications for astrophysical phenomena across the cosmos.

## Notable For
- **Part of a pioneering four-satellite constellation** studying magnetic reconnection in Earth's magnetosphere.
- **Launched alongside three identical counterparts**, forming a unique orbital formation for scientific measurements.
- **Operates in a highly elliptical orbit**, enabling detailed observations of plasma dynamics.
- **Nicknamed "Ringo"** among the MMS satellites, reflecting its role in the mission.
- **Contributes to NASA's solar-terrestrial research**, helping predict space weather impacts.

## Body
### Mission Overview
Magnetospheric Multiscale 4 (MMS4) is the fourth and final spacecraft in NASA's Magnetospheric Multiscale Mission, launched on March 13, 2015. The mission consists of four identical satellites—MMS1, MMS2, MMS3, and MMS4—each equipped with advanced instruments to measure magnetic fields, plasma, and energetic particles. The satellites operate in a highly elliptical orbit, flying in a precise formation to study magnetic reconnection events, where magnetic energy is converted into kinetic and thermal energy.

### Launch and Deployment
MMS4 was launched aboard an Atlas V 421 rocket, designated AV-053, from Cape Canaveral Space Launch Complex 41. The launch occurred at 02:44 UTC on March 13, 2015. The four satellites were deployed into a highly elliptical orbit, allowing them to observe Earth's magnetosphere from varying distances and angles.

### Scientific Contributions
MMS4's primary role is to contribute to NASA's understanding of magnetic reconnection, a process crucial for space weather and astrophysical phenomena. By working in conjunction with the other MMS satellites, MMS4 provides high-resolution data on plasma dynamics, magnetic field interactions, and energy dissipation. This research helps scientists model and predict space weather events, which can affect satellite operations, power grids, and communication systems.

### Operational Details
MMS4 is part of a constellation of four geomagnetic satellites, each named after Beatles members ("John," "Paul," "George," and "Ringo"). The satellites maintain a tight formation, with separations as small as 10 kilometers, to capture detailed measurements of magnetic reconnection events. The mission's data has been instrumental in advancing our knowledge of how magnetic energy is released and transferred in space.

### Legacy and Impact
The Magnetospheric Multiscale Mission, including MMS4, has significantly contributed to solar-terrestrial research. Its findings have improved models of space weather and enhanced our understanding of fundamental plasma processes. The mission's success has paved the way for future studies of magnetic reconnection in Earth's magnetosphere and beyond.

## References

1. Jonathan's Space Report