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CRL. Winter. CRL. RAL England. PREPROCESSOR. Summer. Summer. Winter. RAL. Outside User System. CRL Japan. Summer. Summer. Winter. SEC. Summer. Z-axis. RAL. Ingest/ Queue. ACE Instrument Algorithms. Physical Units. DMS. Operations Center. NOAA. ISRO India. RAL

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CRL

Winter

CRL

RAL

England

PREPROCESSOR

Summer

Summer

Winter

RAL

Outside User System

CRL

Japan

Summer

Summer

Winter

SEC

Summer

Z-axis

RAL

Ingest/

Queue

ACE Instrument

Algorithms

Physical

Units

DMS

Operations

Center

NOAA

ISRO

India

RAL

England

Unpack

Winter

Internet

Winter

Possible

Coverage

CRL

Japan

Summer

Internet

Summer

SEC

Bx,

By,

Bz

25 Re

SEC

  • 434 bps

SELRAS

MAG

Winter

UD

ISRO

India

Winter

Summer

Summer

LANL

KRU

Y-axis

40 Re

SWEPAM

n, v, T

Possible

Coverage

BAN

USAF

SEC

6944 bps

or 434 bps

APL

Low

Energy

Particles

BAN

EPAM

Real-Time Data Server

High

Energy

Particles

NASA

SIS

Caltech

UTC Day

UTC Day

CRL

Japan

434 bps

Period: 177 days

X-axis: ~235 Re where 1 Re = 6378 km

4

0

4

8

0

8

12

12

16

16

20

0

20

0

USAF

NHS

NHS

VTS

VTS

GTS

GTS

Store

Real Time Solar Wind Ground System

DGS

DGS

USAF’s SCN

USAF’s SCN

HTS

HTS

USAF Spacecraft Control Network

NASA’s Deep Space Network Antenna’s

NASA’s DSN

NASA’s DSN

NOAA’s Real Time Solar Wind System

R.D. Zwickl, K.A. Doggett, S. Sahm, W.P. Barrett, R.N. Grubb, T.R. Detman, and V.J. Raben

NOAA Space Environment Center

The NASA ACE satellite was launched in August 1997, with NOAA’a Real Time Solar Wind system becoming operational January 21, 1998. A ground system has been developed with tracking from our partners in Japan, England, France, and India that is complimented with tracking by NASA’a Deep Space Network, the USAF Satellite Control Network, and NOAA’s own station in Boulder. The raw data are broadcast from ACE, collected by the ground stations, and sent to SEC where they are processed and available for operational use within five minutes. The data are now used worldwide in forecast operations, to generate predictive products, and to drive models.

Ground Stations and Tracking

Instruments, Parameters, and Products

Magnetometer - MAG

Bartol Research Institute, University of Delaware

ACE Orbit

Ground Station Location

Calculated Physical Parameters:

Bx, By, Bz, Bt, Time

Operational Resolution = 1-min avg.

ACE

Sun

Solar Wind Electron, Proton, & Alpha Monitor - SWEPAM

Los Alamos National Laboratory

Calculated Physical Parameters:

Density, Speed, Temp, Time

Operational Resolution = 1-min snapshot

Current Tracking Coverage (winter/summer)

Future Tracking Coverage (winter/summer)

Tracking Performance (day/month%)

Electron, Proton, & Alpha Monitor - EPAM

Applied Physics Laboratory, John Hopkins University

Calculated Physical Parameters:

Differential Flux (p/sec/sr/cm2/sec/MeV)

Electrons (keV): 38-53 Protons (keV): 47-65

175-315 112-187

310-580

761-1220

1060-1910

Operational Resolution = 5-min avg.

Solar Isotope Spectrometer - SIS

California Institute of Technology

Updated July 2000

Calculated Physical Parameters:

Integral Proton Flux (p/sec/sr/cm2)

> 10 MeV

> 30 MeV

Operational Resolution = 5-min avg.

Updated July 2000

Updated July 2000

ACE data is received at SEC from our worldwide tracking partners through a variety of ground stations. Tracking coverage is depicted above for each location for winter-time minimum and summer-time maximum conditions. Tracking performance (96% target) shows continued improvement as new stations are added.

Real Time System Data Flow

Derived Products and Driven Models

ACE real-time data is used worldwide to drive space weather models and generate forecast products. SEC uses the data in a variety of ways, including to drive model predictions of a geomagnetic index similar to kp (example at right). A few of the institutions using ACE data for real time operations include:

Australian Space Forecast Centre: Representation of solar wind speed and IMF direction

Chandra Science Operations Team: Alerts of large low-energy proton events

CRL/Hiraiso Solar Terrestrial Research Center, Japan: Predictions of Dst index, and proton distribution in the inner magnetosphere

Danish Meteorological Institute/Swedish Institute of Space Physics: Predictions of AE, Dst, and Kp indices

Geospace Hydrodynamics Laboratory, Sofia, Bulgaria: 3-D determination of the magnetosheath

Ionospheric and Space Physics Group at SRI International: Space weather alert webpage utilizing updates from SWEPAM and EPAM

Lockheed Martin Advanced Technology Center, Palo Alto, CA: Dynamic modeling of the Earth's bow shock and magnetopause

Nonlinear Dynamics and Space Physics (NDSP) Group at NASA's Goddard Space Flight Center: Prediction of Dst, AL, and AU indices

Southwest Research Institute: Real time Assimilative Mapping of Ionospheric Electrodynamics (rtAMIE)

Space Physics Research Group at U.C. Berkeley: Prediction of Dst index

Space Physics Research Laboratory, University of Michigan: Linear Modeling of Ionospheric Electrodynamics (LiMIE)

Space Research Institute, Moscow: Geomagnetic storm and substorm warnings

University of Alaska Fairbanks and the Arctic Region Supercomputing Center: UAF Eulerian Parallel Polar Ionosphere Model

This diagram shows the general data flow through the entire real time solar wind system, including data ingest and unpack from the ground stations, calculation of the physical units, and distribution to the primary data destinations. Public access to the real time data is through the SEC Outside User System (www.sec.noaa.gov).

© July 2000 NOAA SEC