Introducing our new HAPI server

July 31, 2026

We are happy to announce the release of our new HAPI server, available at https://api.phys.ucalgary.ca/hapi. The Heliophysics Application Programmer's Interface (HAPI) is a community-developed specification that defines a standard RESTful interface for serving time series data. It is widely used across the heliophysics community, and a growing ecosystem of client libraries and analysis tools can talk to any HAPI-compliant server, including ours. The server currently provides 46 datasets from our RF instrument networks:

• NORSTAR riometer - K0 raw signal and K2 absorption data
• SWAN Hyper Spectral Riometer (HSR) - K0 raw power data

Alongside the server, we have added a new HAPI Server documentation page to this website. It includes:

• An interactive plot viewer - Choose a dataset and time range, load the data directly into your browser, and plot it. No code required!
• A live dataset catalog - Browse all available datasets and their metadata (time range, cadence, location, parameters, and more)
• A download builder - Select a dataset, time range, and output format to generate a direct download URL, along with matching Python and curl examples

Since HAPI is designed for time series data, optical data (all-sky imagers, spectrographs) is not served by the HAPI server. For that data, please continue to use our Python and IDL libraries, our main API endpoints, or any of the other standard access methods we provide (HTTP, FTP, Rsync).

For more information about the protocol/specification, and to explore other HAPI servers, visit hapi-server.org.

Explore HAPI server and data further