NASA’s Van Allen Probe A concluded its nearly 14-year mission in space with a dramatic reentry to Earth on Wednesday, March 11.
The satellite, which tipped the scales at over 1,300 pounds, made its descent through Earth’s atmosphere before making a splashdown in the eastern Pacific Ocean. The landing occurred south of Mexico and west of Ecuador at 6:37 a.m. EDT, precisely at coordinates 2 degrees south latitude and 255.3 degrees east longitude, as confirmed by the U.S. Space Force.
Prior to its reentry, NASA had assessed the risk of any potential harm from the satellite as minimal, estimating a 1 in 4,200 chance of causing damage to Earth.
Throughout its years in orbit, NASA anticipated that the satellite would primarily burn up and disintegrate during reentry, although it acknowledged that certain components might survive the fiery descent.
Initial forecasts had slated the satellite’s reentry around 7:45 p.m. EDT on March 10, allowing for a 24-hour window of uncertainty.
Launched to explore the belts of charged particles encircling our planet, the Van Allen Probe A has provided invaluable data during its mission.
From 2012 to 2019, the satellite, along with its twin, Van Allen Probe B, spent time exploring how Earth’s magnetic field captures and releases radiation.
After the mission came to a close in 2019, they analyzed data that showed the spacecraft to re-enter Earth’s atmosphere in 2034, but scientists calculated those findings before the current solar cycle, “which has proven far more active than expected,” they said.
By 2024, the Sun had reached its solar maximum, sparking frequent and intense space weather events.
These conditions increased atmospheric drag on the spacecraft well beyond initial projections, speeding up its descent and causing it to re-enter earlier than expected.
The mission yielded major discoveries about how the radiation belts operate, including data that revealed the existence of a transient third radiation belt.
The data collected from both probes will keep enhancing scientists’ understanding of Earth’s radiation belts and play a crucial role in studying space weather and its wide-ranging effects.
