NASA's IRIS mission targets the sun's mysterious million-degree atmosphere
In short: How does the sun power its million-degree atmosphere and drive the solar wind? To reveal how solar matter behaves in transit, NASA's IRIS project intends to examine the poorly grasped zone separating the corona from the sun's photosphere.
The Interface Region Imaging Spectrograph (IRIS) mission represents a significant step in solar physics. Departing California's Vandenberg Air Force Base on 26 June, this Small Explorer Mission is known as IRIS. Its primary objective is to observe the characteristics of solar material as it transitions through the interface region. This specific zone sits between the sun's photosphere and the corona, a region that remains poorly understood by scientists but is responsible for powering the sun's extreme atmosphere.
This research is vital for understanding the solar wind and high-energy space weather. Space weather events, such as coronal mass ejections and the aftermath of solar flares, pose tangible risks to human infrastructure. These phenomena can disrupt satellites, impact air travel, and threaten power grids on Earth. NASA seeks to offer more dependable predictions by investigating the core physics of such occurrences, a necessity for safeguarding spacefarers on upcoming journeys to Mars and the Moon.
IRIS joins a suite of sophisticated solar observations, including the Parker Solar Probe. Launched in August 2018, the Parker Solar Probe has already completed 29 close approaches to the sun. During its most recent encounter on September 4, it reached a top speed of 430,000 miles per hour and came within 3.8 million miles of the solar surface. While IRIS focuses on the interface region, Parker explores the corona directly, sampling nearly 40% of the solar circumference in a single day.
The broader context of these missions is framed by the 'Living With a Star' program. This project investigates elements of the sun-earth system that have a direct impact on human life and the community. As the sun reached its solar maximum period in 2024, these missions provide critical data on the sun's behavior during its most active phases. These efforts are managed by the Goddard Space Flight Center and the Johns Hopkins Applied Physics Laboratory to ensure humanity can navigate the complexities of our nearest star.
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Sources
- Summary by Intellect · source: Latest Solar Mission Launched on NASA TV
- Also: After Latest Swing Past Sun, NASA’s Parker Solar Probe Checks in
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