Here's a breakdown of what heliophysics encompasses:

* Solar Physics: Focuses on the Sun itself, its internal structure, composition, and the processes happening within it, like nuclear fusion.

* Solar Astronomy: Studies the Sun's external features like the photosphere, chromosphere, and corona, as well as phenomena like sunspots, flares, and coronal mass ejections.

* Space Weather: Explores the effects of solar activity on Earth and other planets, including the impact of solar flares, solar wind, and coronal mass ejections on our atmosphere, satellites, and power grids.

* Solar System Physics: Investigates how the Sun interacts with the rest of the solar system, including the influence of its gravity and radiation on the planets and their moons.

Heliophysics is a multidisciplinary field that draws on knowledge from physics, astronomy, astrophysics, and space science. It's vital for understanding the Sun's role in the solar system and its influence on our planet.