Los Alamos Develops Instruments for NASA’s Solar Research Mission

Scientists at Los Alamos National Laboratory (LANL) have designed two advanced instruments for a NASA mission aimed at enhancing our understanding of the sun and its protective heliosphere. The instruments are part of the Interstellar Mapping and Acceleration Probe (IMAP), which launched in September 2023 and is currently en route to the first Lagrange point, a gravitationally stable position between the Earth and the sun. This mission represents a significant step in solar research, aiming to shed light on how the heliosphere protects the solar system from harmful galactic rays.

The IMAP spacecraft is equipped with ten instruments, two of which were developed at LANL. The journey to the Lagrange point is expected to take approximately four months, with full operational capabilities anticipated by mid-January 2024. This mission builds upon data obtained from NASA’s Interstellar Boundary Explorer (IBEX), launched in 2008. The IMAP-Hi instrument, engineered at LANL, promises improved capabilities to filter out background noise, addressing limitations encountered during the IBEX mission.

According to Herb Funsten, the instrument lead on IMAP-Hi, the previous IBEX mission was characterized by unexpected discoveries due to its less optimized design. “We didn’t know what we were actually going to find,” he explained, highlighting the challenges of exploratory missions. The advanced design of IMAP-Hi aims to provide clearer data on galactic rays, which are highly charged particles that pose risks to human DNA and can disrupt communications and satellite operations.

The heliosphere, created by the sun’s solar wind, serves as a protective barrier against galactic radiation, reducing its intensity significantly. The outer layer of this structure, known as the heliosheath, plays a crucial role in safeguarding our solar system. Researchers are keen to investigate the sun’s unique contributions to this phenomenon, as it presents an opportunity for direct study unlike other stars.

Instruments to Enhance Solar Wind Understanding

The two instruments, IMAP-Hi and the Solar Wind Electron instrument, are designed to provide critical data on solar activity. IMAP-Hi is responsible for collecting and mapping energetic neutral atoms, which will help researchers decipher the heliosphere’s composition and the origins of these particles. Meanwhile, the Solar Wind Electron instrument focuses on tracking electrons emitted from the solar wind, enabling scientists to determine the heliosphere’s size and shape, as well as its interactions with the interstellar medium.

LANL scientist Dan Reisenfeld likened the process of tracking solar wind to bats using sonar to navigate. “It has to figure out how far away these things are,” he said, emphasizing the innovative approach employed by the instruments to chart the heliosphere’s boundaries. The heliosphere’s dimensions appear to fluctuate in sync with the sun’s 11-year solar cycle, exhibiting variations that could affect its protective capabilities.

Recent observations by the Solar Wind Electron instrument have already tracked a significant solar storm that occurred around November 2023, resulting in visible northern lights at lower latitudes than usual. While the spectacle is captivating, Ruth Skoug, lead scientist on the Solar Wind Electron instrument, noted that solar storms can have detrimental effects. They can disrupt power systems and pose hazards to astronauts, highlighting the need for enhanced understanding and prediction of solar activity.

As the instruments prepare for their operational phase, scientists are optimistic about their potential to improve predictions of solar storms and their impacts. “We’re going to do even better on the next storm, with all the instruments on,” Skoug stated, emphasizing the mission’s significance for both scientific discovery and practical applications in space weather forecasting.