NOAA / Space Weather Prediction Center

ACE header with logos


Real Time Data

More ACE Links

* Leaving SWPC web site

ACE RTSW News and Announcements


Geomagnetic storms are a natural hazard, like hurricanes and tsunamis, which the National Oceanic and Atmospheric Administration (NOAA) Space Weather Prediction Center (SWPC) forecasts for the public's benefit. Severe geomagnetic storms cause communications problems, abruptly increase drag on spacecraft, and can cause electric utility blackouts over a wide area. The location of ACE at the L1 libration point between the earth and the sun will enable ACE to give about a one hour advance warning of impending geomagnetic activity.

NOAA has arranged for the transmission of a subset of data from four ACE instruments during the times when ACE is not transmitting it's full telemetry to the Deep Space Network. For about 21 of 24 hours per day, ACE will send data (~464 bps) to NOAA operated ground stations. During the other three hours when NASA is getting high rate data through the Deep Space Network, NOAA will get a copy of the real time data. NOAA will process all the data (using algorithms provided by the ACE experimenters) at its Space Weather Operations (SWO) in Boulder, Colorado, which will issue any warnings of expected geomagnetic activity.

The four ACE instruments and the data they will supply are:

  • EPAM *- Energetic Ions and Electrons
  • MAG *- Magnetic Field Vectors
  • SIS *- High Energy Particle Fluxes
  • SWEPAM * - Solar Wind Ions

Last Page Update: May 19, 2011
Questions and comments concerning these pages or the operational use of ACE Real Time Solar Wind can be addressed to: