Heliophysics Foundational Research

The Heliophysics Foundational Research (HFR) program element supports investigations aimed at enhancing our fundamental understanding of the physical processes that drive space weather activity and govern the interconnectedness of the Sun-Earth system, as well as the broader heliosphere. The HFR program distinguishes itself by its emphasis on the foundational physics and drivers of space weather, rather than solely focusing on forecasting capabilities. While the insights gained may have implications for future prediction improvements, the primary objective is to build a more comprehensive and fundamental understanding of the Heliophysics system. The HFR program element is intended to support forward-looking research that is on the forefront of Heliophysics science, and which will help motivate and enable the next generation of Heliophysics missions. Within this broad scientific scope, the HFR program element solicits Strategic Science Topics (SST) that directly support current strategic needs of NASA Heliophysics. SSTs to be solicited this year will be described in an amendment to this program element. The HFR program element is a component of the Heliophysics Research Program and proposers are encouraged to see B.1 The Heliophysics Research Program Overview for Heliophysics-specific requirements. Common requirements for all ROSES elements and proposals are found in the ROSES Summary of Solicitation and the NASA Grant and Cooperative Agreement Manual, and the order of precedence for proposers is the following: 1. ROSES-2025 Element B.2 (this document), 2. ROSES-2025 B.1 The Heliophysics Research Program Overview 3. The ROSES-2025 Summary of Solicitation, and 4. The NASA Grant and Cooperative Agreement Manual (GCAM). Proposers to HFR should be familiar with all these resources.