NOUS41 KWBC 221330



Service Change Notice 16-22

National Weather Service Headquarters Washington DC

930 AM EDT Wed Jun 22 2016


TO:        Subscribers:

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           Other NWS partners and NWS employees


FROM:      Dr. William H. Bauman III

           Chief, Aviation and Space Weather Services Branch


Subject:   NOAA DSCOVR spacecraft to replace NASA ACE at the

           Space Weather Prediction Center (SWPC) effective

           July 27, 2016


Beginning at 1600 Coordinated Universal Time (UTC) on Wednesday,

July 27, 2016, the National Centers for Environmental Prediction

(NCEP) Space Weather Prediction Center (SWPC) will begin using

data from the Deep Space Climate Observatory (DSCOVR) spacecraft

in its operations.


DSCOVR replaces data currently used operationally at SWPC from

NASA's aging research satellite, the Advanced Composition

Explorer (ACE). DSCOVR was launched on February 11, 2015, and

reached final orbit on June 8, 2015. DSCOVR is 1 million miles

from Earth where the gravitational influence of the Sun and the

Earth are in equilibrium. From that point, DSCOVR serves as a

distant early-warning sentinel, like a tsunami buoy in space, to

alert NOAA of incoming eruptions from the Sun.


DSCOVR's primary space weather sensors are the Faraday Cup

plasma sensor, which measures the speed, density and temperature

of the solar wind, and a magnetometer, which measures the

strength and direction of the solar wind magnetic field.

Together, the instruments provide SWPC forecasters with the

necessary information to issue geomagnetic storm warnings.


Data from DSCOVR's instrumentation will provide better

information to forecasters and allow existing and future

forecast models to run more reliably. The improvements will also

open new opportunities for researchers to better understand

coronal mass ejections along with high-speed solar wind and

shocks, and to find ways to improve space weather forecasting.


DSCOVR data will be available in real-time at:


From the webpage above, users can download data, create plots,

and find links to other ways to access real-time and archived

data. These links are currently populated with NASA ACE data. 

On July 27, the links will be populated with data from DSCOVR. 


Archived data from DSCOVR (data older than 1 day) will be

available at the NOAA Satellite and Information Service (NESDIS)

National Centers for Environmental Information (NCEI) site

located at:


For questions regarding the transition to DSCOVR please contact:


   Doug Biesecker

   NCEP SWPC/Boulder, Colorado



National Service Change Notices are online at: