The TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) mission is a pair of satellites that will study how the solar wind, the continuous stream of ionized particles escaping the Sun and pouring out into space, interacts with Earth’s magnetosphere, the region around Earth dominated by our planet’s magnetic field. The mission will help answer key questions about how the Sun influences Earth, and ultimately drives space weather that impacts technology and communications.

Specifically, TRACERS will study the phenomenon of magnetic reconnection, an explosive transfer of energy that can happen when two magnetic fields meet.

Magnetic reconnection happens throughout space but is of special relevance to us where the solar wind first meets Earth’s magnetosphere, a region known as the magnetopause. A reconnection event can shoot solar wind particles, normally diverted around our planet, directly into our atmosphere at high speeds. These particles ignite the beautiful northern and southern lights, known as aurora, and help drive space weather on Earth. Understanding space weather patterns is paramount in our increasingly technologically driven society, as space weather events can affect our power grids and communications satellites, and create potentially hazardous conditions for astronauts.

To study magnetic reconnection at Earth’s magnetopause, TRACERS’ twin satellites will fly in tandem — one behind the other — through the polar cusps, funnel-shaped regions where Earth’s magnetic field opens over the north and south poles. This will allow scientists to observe how quickly reconnection changes and evolves by comparing data collected by each satellite.

The TRACERS mission is led by David Miles at the University of Iowa and managed by the Southwest Research Institute in San Antonio. NASA’s Heliophysics Explorers Program Office at the agency’s Goddard Space Flight Center in Greenbelt, Maryland, provides mission oversight to the project for the agency’s Heliophysics Division at NASA Headquarters in Washington.

Courtesy of NASA.

Falcon 9 is a reusable, two-stage rocket designed and manufactured by SpaceX for the reliable and safe transport of people and payloads into Earth orbit and beyond.

Falcon 9 is the world’s first orbital-class reusable rocket.

Stats

Completed missions: 460

Total landings: 415

Total reflights: 387

The Falcon 9 has launched 62 humans into orbit since May 2020

Specs

Height: 70 m / 229.6 ft

Diameter: 3.7 m / 12 ft

Mass: 549,054 kg / 1,207,920 lb

Payload to Low Earth Orbit (LEO): 22,800 kg / 50,265 lb

Payload to Geostationary Transfer Orbit (GTO): 8,300 kg / 18,300 lb

Payload to Mars: 4,020 kg / 8,860 lb

On January 24, 2021, Falcon 9 launched the first ride-share mission to Sun Synchronous Orbit. It was delivering a record-setting 143 satellites to space. And while this was an important mission for SpaceX in itself, it was also the moment Falcon 9 overtook United Launch Alliance’s Atlas V for the total number of consecutive successful launches.

SpaceX’s Falcon 9 had become America’s workhorse rocket, launching 31 times in 2021. It has already beaten that record this year, launching almost an average of once a week. While most of the launches deliver Starlink satellites to orbit, the company is still launching the most commercial payloads to orbit, too.

Falcon 9 is a medium-lift launch vehicle, with the capability to launch over 22.8 metric tonnes to low earth orbit. Unlike any other rocket, its first stage lands back on Earth after separating from its second stage. In part, this allows SpaceX to offer the cheapest option for most customers with payloads that need to reach orbit.

Under its ride-share program, a kilogram can be placed in a sun-synchronous orbit for a mere 1.1 million dollars, far cheaper than all other currently operating small satellite launch vehicles.

The reusability and fast booster turnaround times have made Falcon 9 the preferred choice for private companies and government agencies. This has allowed SpaceX to capture a huge portion of the launch market.

Photo courtesy of Jenny Hautmann for Supercluster.

Space Launch Complex 4 (SLC-4) at Vandenberg Space Force Base is SpaceX’s west coast launch and landing facility, with its launch pad designated SLC-4E (the eastern-most of the two areas). Originally built in the early 1960s for Atlas-Agena rockets, the pad served that rocket line until 1967, when it was taken offline and rebuilt for Titan IIID rockets. From 1971 to 1988, SLC-4E launched Titan IIID rockets, after which it was reconfigured for Titan IV missions, which continued between 1991 and 2005.

In 2011, SpaceX leased SLC-4E and spent two years rebuilding the pad for its Falcon 9 rocket. From 2013 to 2019, the pad exclusively supported Falcon 9 polar missions. However, in 2020, SpaceX began splitting polar launches between Vandenberg and Cape Canaveral, after the Air Force lifted a 51-year ban on Florida-based polar launches, previously imposed due to the risk of overflying Cuba during launch. Despite these new opportunities from Florida, SpaceX plans to continue utilizing Vandenberg, with many more launches scheduled from this location.

Photo by Supercluster

"Of Course I Still Love You" (OCISLY) is one of SpaceX’s Autonomous Spaceport Drone Ships used to recover Falcon 9 rocket boosters from the ocean. Like its sister ships, "Just Read the Instructions" (JRTI) and "A Shortfall of Gravitas" (ASOG), OCISLY plays a crucial role in SpaceX’s reusability program, which aims to make spaceflight more cost-effective and sustainable.

The name "Of Course I Still Love You" is inspired by science fiction author Iain M. Banks' Culture series, known for its imaginative and whimsical ship names. This naming theme extends to SpaceX's other drone ships.

OCISLY originally operated in the Atlantic Ocean, primarily from Cape Canaveral, Florida. It has since been retired and replaced by ASOG in the Atlantic, with its operations shifting to the Pacific Ocean.

Equipped with advanced navigation systems and thrusters for precise positioning, OCISLY featured a large landing platform designed for recovering rocket boosters at sea. It was instrumental in supporting missions where boosters couldn’t return to solid ground, enabling SpaceX to reuse rocket stages and contribute to lowering costs and improving the sustainability of space missions.