The NOAA Real-Time Solar-Wind (RTSW) System using ACE Data |
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Authors: | Zwickl RD Doggett KA Sahm S Barrett WP Grubb RN Detman TR Raben VJ Smith CW Riley P Gold RE Mewaldt RA Maruyama T |
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Institution: | (1) Space Environment Center, NOAA, Boulder, Colorado, 80303, U.S.A.;(2) Bartol Research Institute, University of Delaware, Newark, Delaware, 19716, U.S.A.;(3) Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, 20707, U.S.A.;(4) California Institute of Technology, Pasadena, California, 91125, U.S.A.;(5) Communications Research Laboratory, Tokyo 184, Japan |
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Abstract: | The Advanced Composition Explorer (ACE) RTSW system is continuously monitoring the solar wind and produces warnings of impending
major geomagnetic activity, up to one hour in advance. Warnings and alerts issued by NOAA allow those with systems sensitive
to such activity to take preventative action. The RTSW system gathers solar wind and energetic particle data at high time
resolution from four ACE instruments (MAG, SWEPAM, EPAM, and SIS), packs the data into a low-rate bit stream, and broadcasts
the data continuously. NASA sends real-time data to NOAA each day when downloading science data. With a combination of dedicated
ground stations (CRL in Japan and RAL in Great Britain), and time on existing ground tracking networks (NASA's DSN and the
USAF's AFSCN), the RTSW system can receive data 24 hours per day throughout the year. The raw data are immediately sent from
the ground station to the Space Environment Center in Boulder, Colorado, processed, and then delivered to its Space Weather
Operations center where they are used in daily operations; the data are also delivered to the CRL Regional Warning Center
at Hiraiso, Japan, to the USAF 55th Space Weather Squadron, and placed on the World Wide Web. The data are downloaded, processed
and dispersed within 5 min from the time they leave ACE. The RTSW system also uses the low-energy energetic particles to warn
of approaching interplanetary shocks, and to help monitor the flux of high-energy particles that can produce radiation damage
in satellite systems.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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