en.Wedoany.com Reported - NASA has selected the Dynamic Atmosphere-Ionosphere Explorer (DAPHNE) mission concept to officially enter Phase B development, advancing its plans to protect orbital infrastructure and human spaceflight.
The project will study how turbulence in Earth's lower atmosphere propagates upward and disrupts the space environment. By detailing the collision mechanisms between Earth's energy and solar forces, the mission aims to fundamentally improve space weather forecasting models. These disturbances can degrade the accuracy of the Global Positioning System (GPS), affect the operation of satellites in Low Earth Orbit (LEO), and increase radiation risks for astronauts beyond Earth's magnetic shielding. Phase B development will focus on refining the flight architecture, finalizing instrument designs, and planning mission operations.
The mission tracks ionization fronts. For decades, heliophysics research has primarily focused on top-down models, tracking the effects of solar flares, coronal mass ejections, and solar wind on the upper atmosphere. However, modern scientific assessments show that a significant portion of upper atmospheric variability is actually driven from below, influenced by weather patterns, temperature fluctuations, and wind vectors closer to Earth's surface. The DAPHNE architecture fills this scientific gap by deploying a pair of identical satellites in very low Earth orbit for formation flying. Operating as a coordinated pair, these satellites will obtain multi-point simultaneous measurements within the thermosphere and ionosphere—the thin, highly variable boundary layer where Earth's neutral atmosphere transitions to space-borne ionized plasma.
Each satellite will carry three dedicated remote sensing instruments: the Global High-Resolution Thermospheric Imaging Michelson Interferometer (MIGHTI), the Far Ultraviolet Ionospheric Imager (FUVI), and the Orbital Plasma Analysis Telescope (PLATO). This payload suite provides high-fidelity data on neutral winds, ambient temperature, and gas composition. By incorporating lower atmospheric energy into space weather models, researchers can clearly trace the path of energy propagating upward through the orbital column.
The DAPHNE mission is characterized by high heritage and low risk. Initially proposed as a tailored concept study in response to NASA's Dynamic Neutral Atmosphere-Ionosphere Coupling (DYNAMIC) opportunity, it has been identified as a key structural priority by the National Academies' Heliophysics Decadal Survey. The mission is led by Principal Investigator Aimee Merkel from the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado Boulder. LASP is collaborating with BAE Systems Space & Mission Systems in Boulder for spacecraft manufacturing and with the Naval Research Laboratory in Washington, D.C., for core instrument integration. Merkel stated after the project selection that DAPHNE will fill a major gap in scientific understanding, helping to answer long-standing questions about how Earth interacts with the Sun.
The project is designed as a low-risk, high-heritage endeavor, leveraging proven engineering frameworks to maximize scientific data return per unit of funding. Upon completion of Phase B, the mission will face a formal NASA confirmation review in 2027 to assess development progress and allocate final flight funding. If confirmed, the total mission cost is strictly capped at $250 million (in fiscal year 2023 dollars), excluding launch procurement, with a target launch window no earlier than 2029. Full lifecycle management oversight will be conducted through the Solar-Terrestrial Probes program at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
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