NASA’s Van Allen Probe A, which has been gathering crucial data since its launch in 2012, is expected to re-enter Earth’s atmosphere at approximately 19:45 EST (00:45 GMT) on Tuesday. The space vehicle will disintegrate largely upon re-entry. Some parts may be able to withstand the extreme heat and pressure of atmospheric entry. The agency has established a 24-hour window of uncertainty before or after the timing of this event. This flexibility makes up for subtle variations in the spacecraft’s descent.
The Van Allen Probe A, along with its twin Van Allen Probe B, was designed to study Earth’s two permanent radiation belts. These belts are critical first lines of defense for our planet. They protect us from cosmic radiation, solar storms, and the sly solar wind. For almost seven years, the mission flourished and produced groundbreaking discoveries. One of the most thrilling discoveries was the detection of a temporary third radiation belt. Originally planned as a two-year mission, the duration was extended as a result of the probes’ strong design and capabilities.
NASA recently estimated that Van Allen Probe A had a one in 4,200 chance of harming someone when it re-enters the atmosphere. That means the risk is minimal, but it’s not one to ignore. This 1 in 2731 odds is a testament to the extensive planning and safety measures put into the mission. Despite some components possibly surviving, experts anticipate that the majority of the spacecraft will disintegrate before reaching the Earth’s surface.
Each Van Allen Probe tipped the scales at more than 1,300 pounds (600 kilograms). They were loaded with detector instruments that gauged the physical processes controlling how particles are acquired, and subsequently lost from Earth’s radiation belts. From 2012 to 2019, they flew through halos of charged particles ensnared by Earth’s magnetic field. Through this journey, we gained further insights with rich data that expanded our comprehension of space weather phenomena and its repercussions on both technology and human activities.
Van Allen Probe A will be completing its mission, but not without one last surprise. Van Allen Probe B will not re-enter Earth’s atmosphere until after 2030. This ongoing mission will enable greater science return and further investigation of the complex interactions at play in Earth’s radiation environment.
