sidc_k_forecast.ivo://ksb-orb.dc/sidc_k_forecast/q/epn_coreSIDC: Solar Influences Data analysis CenterRoyal Observatory of Belgium2026-10-27T13:30:37Zsidc support

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sidc-support@oma.bethe-sunsolar-physicssolar-system-astronomy One predicted local geomagnetic K index per three-hour interval and source forecast issue.https://vo-tap.oma.be/tableinfo/sidc_k_forecast.epn_coreGeneralUniversityResearchIsServedByROB Virtual Observatory Data Center TAP servicesidc_k_forecast Historical 3-hour geomagnetic K-index forecasts. Each row covers one [start_time, end_time) interval and one forecast issue. Different issues forecasting the same interval are retained separately.sidc_k_forecast.epn_core One predicted local geomagnetic K index per three-hour interval and source forecast issue.granule_uidStable identifier built from source forecast ID and complete three-hour interval start timestamp.meta.id;meta.maincharindexedprimarysource_forecast_idPrimary key of the original forecast record in SIDC MySQL.meta.idlongissue_timeEffective issue time in JD: Nominally matching the issue time of the ursigram (ursigram.date_of_issue); otherwise forecast.forecast_date plus 750 minutes.dtime.epochdoubleindexedstart_timeStart time of the interval for the K index forecast, expressed as Julian Date (JD); source times assumed UTC.dtime.startdoubleindexedend_timeEnd time of the interval for the K index forecast, expressed as Julian Date (JD); nominally +3h after the start_time.end; boundary is exclusive; source times assumed UTC.dtime.enddoublek_indexPredicted three-hour local geomagnetic K index (dimensionless); not automatically a planetary Kp forecast. The first four entries (corresponding to the forecast, i.e. 00:00-12:00 UTC of the first day) are replaced by measured values.int