Solar Features And Events

Helioviewer.org’s solar features and events annotation layer is powered by the Heliophysics Events Knowledgebase (HEK) provided by the Lockheed Martin Solar & Astrophysics Laboratory (LMSAL).

Consult LMSAL’s HEK API Documentation for more information.

Events

GET /v2/events

Returns a list of HEK events in the Heliovewer Event Format.

Request Parameters
Parameter	Required	Type	Example	Description
startTime	Required	string	2023-01-01T00:00:00Z	Specific time to get predictions for.
sources	Optional	string	HEK,DONKI	Specify the external data sources to use for the request If not provided, all sources will be queried Current options are HEK and DONKI.

See Heliovewer Event Format for the response format.

Event specific data conforms to the HEK Event Specification

Example: Get HEK Events for 2023-03-30

Example Query

https://api.helioviewer.org/v2/events/?date=2023-03-30T00:00:00Z

Example Response

[
    {
        "name": "Active Region",
        "pin": "AR",
        "groups": [
        {
            "name": "NOAA SWPC Observer",
            "contact": "http://www.swpc.noaa.gov/",
            "url": "N/A",
            "data": [
            {
                "absnetcurrenthelicity": null,
                "active": "true",
                "area_atdiskcenter": 213057280,
                "area_atdiskcenteruncert": null,
                "area_raw": null,
                "area_uncert": null,
                "area_unit": "km2",
                "ar_axislength": null,
                "ar_compactnesscls": "",
                "ar_lengthunit": "",
                "ar_mcintoshcls": "HAX",
                "ar_mtwilsoncls": "ALPHA",
                "ar_neutrallength": null,
                ...
            },
            ...
            ]
        },
        ...
        ]
    },
    ...
]