The forecaster on duty at the SIDC observes and processes all relevant Space Weather data, including automated feature alert processes. Based on his/her observations the forecaster on duty triggers alerts where automated processes have failed or are late and follows up and provides complementary information on the automated alerts.
| issue time | alert text |
|---|---|
2026-02-18T19:41:42Z | The CACTUS halo CME alert issued at 13:44 UTC on Feb 18 reporting a halo CME with launch time 05:48 UTC on Feb 18 is a false detection. There is a partial halo CME with launch time around 04:48 UTC on Feb 18, directed south-westward. This CME is backsided and will not affect the Earth. |
This web page forms part of the European Space Agency's network of space weather services and service development activities, and is supported under ESA contract number 4000134036/21/D/MRP.
For further product-related information or enquiries contact helpdesk. E-mail: helpdesk.swe@esa.int
All publications and presentations using data obtained from this site should acknowledge Solar Influences Data analysis Centre (SIDC) at the Royal Observatory of Belgium (ROB) and The ESA Space Safety Programme.
For further information about space weather in the ESA Space Safety Programme see: www.esa.int/spaceweather
Access the ESA SWE portal here: swe.ssa.esa.int
The data contained in the present page are Intellectual Property of the Royal Observatory of Belgium (ROB). Use of the data is restricted by the ROB data policy. We kindly acknowledge the provision by the SOHO/LASCO team of the coronograph data that lie at the basis of these CME detections.
This product can also be used via a Web API (application programming interface) for programmatically accessing the files by requesting specific URL-encoded parameters. The list of mandatory and optional variables for this specific product are included in tables 1 and 2 below:
| Variable | Values required for this product |
|---|---|
| pc | S112 |
| psc | z |
| component | latest | archive |
| Variable | Values |
|---|---|
| dts_start, dts_end | yyyy-MM-ddTHH:mm:ssZ |
To access the latest data, the "component" parameter in the API URL should be set to "latest" (component=latest).
The URL is as follows:
https://ssa.sidc.be/prod/API/index.php?component=latest&pc=S112&psc=z
returns the latest human operator alert.
To access the archived data, the "component" parameter in the API URL should be set to "archive" (component=archive).
The URL is as follows:
https://ssa.sidc.be/prod/API/index.php?component=archive&pc=S112&psc=z
returns any human operator alerts that occurred in the past 7 days in JSON format as default.
In order to select a specific time range, the two parameters "dts_start" and "dts_end" need to be added, using the format yyyy-MM-ddTHH:mm:ssZ
For example, the URL:
https://ssa.sidc.be/prod/API/index.php?component=archive&pc=S112&psc=z&dts_start=2017-09-08T00:00:00Z&dts_end=2017-09-11T23:59:59Z
returns any human operator alerts that occurred from 8 September 2017 to 11 September 2017 in JSON format.
The archive is queryable back to 14 July 2000.
Note 1: All names in the JSON contain 'presto'. This is a database naming convention and should not be confused with the human generated naming convention.
Note 2: Results are (intentionally) not sorted.
JSON example|
{ "presto_text_oldstyle": [ { "id": [unique id] "data": { "text": [alert text], "issue_time": [issue time alert], "creator": [integer_value] }, "name": [unique name for this record], "event_type": "presto_text_oldstyle" }, REPEAT ] } |
The forecaster on duty at the SIDC observes and processes all relevant Space Weather data, including automated feature alert processes (such as the S112a and S112b products).
Based on their observations the forecaster on duty triggers a Presto alert when one of the following conditions are met:
If no data has been received from GOES or from Dourbes then no alert can be issued.
The Latest tab displays the most recent human moderated (Presto) alert issued, giving the alert time and the alert text providing the details of the observations. The alert is also available via the API access in JSON format.
The Query tab displays the archived Presto alerts with any alerts issued in the last 7 days displayed as default. The time range can be modified to access data from another period by providing start and end dates in the format yyyy-MM-ddTHH:mm:ssZ. If no flare alerts were issued in the selected period then no results are given. The archived alerts are also available via the API access in JSON format. The archive begins 14 July 2000 at 12:00 UT (2000-07-14T12:00:00Z).
