The Helioviewer Project is an open-source project designed to enable everyone to explore the sun and its inner heliosphere. The project allows users to view all kinds of features and events, including coronal cavities, coronal jets, coronal rains, eruptions, filaments, flares, oscillations, sunspots, and more. The Helioviewer Project is funded by the ESA and NASA. Its datasets can be accessed programmatically via REST API.
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So far, we don't have a record of any changes to this API