Michael L. Kaiser
STEREO Project Scientist
NASA/Goddard Space Flight Center
STEREO
May 2, 2008
STEREO at 1.25 years
STEREO-B (BEHIND) OBSERVATORY
Deployed SWAVES Electric Field Antenna
(3 places)
DeployedIMPACT Boom
IMPACTSolar Wind Electron Analyzer (SWEA)
IMPACTSuprathermal Electron Detector
(STE)
IMPACTMagnetometer
(MAG)
SECCHI Heliospheric Imager
(HI)
SECCHISun-Centered ImagingPackage (SCIP) Assy
(COR-1, COR-2, EUVI, GT)
PLASTIC Instrument
IMPACT SEP
1.1m X 2.0 m X 1.2 m
610 kg
≥ 600 W
STEREO Orbits
Sun SunEarth
Ahead @ +22/year
Behind @ -22/year
Heliocentric Inertial Coordinates(Ecliptic Plane Projection)
Geocentric Solar Ecliptic CoordinatesFixed Earth-Sun Line
(Ecliptic Plane Projection)
Ahead
BehindEarth
1 yr.
2 yr.
3 yr.4 yr.
1yr.
2yr.
3 yr.4 yr.
STEREO Space Weather Data Products
Highest resolution data – available 24-48 hrsSECCHI: 2048 X 2048 imagesIMPACT: fluxes (10s sec), moments (few sec) and B (<1 sec)PLASTIC: fluxes and moments 1 min resolutionSWAVES: intensities from all frequencies (~367) every 15 sec
Other data products – available TBDKey parametersCatalogs and event tablesMovies
Research
Beacon (space weather) data – available ‘immediately’SECCHI: ~7 256 X 256 images every hour SECCHI: ~7 256 X 256 images every hour IMPACT: 1 min aves of B, 1 min aves solar wind moments and selected SEP fluxesIMPACT: 1 min aves of B, 1 min aves solar wind moments and selected SEP fluxesPLASTIC: 1 minute resolution selected moments and fluxesPLASTIC: 1 minute resolution selected moments and fluxesSWAVES: 1 minute summaries of alternate frequencies (0.1-16 MHz)SWAVES: 1 minute summaries of alternate frequencies (0.1-16 MHz)
‘Operational’
http://stereo-ssc.nascom.nasa.gov/beacon/
SECCHI
IMPACT/PLASTIC
IMPACT SEP
Beacon Status• Receive beacon telemetry from England, Japan,
and France on a regular basis – overall coverage 50-90%
– Toulouse station recently added
– Not certain about continued funding for station in England
– Wallops tracking is top priority—paperwork is main delay
– NOAA examining link margins for extended mission
• All SECCHI telescopes are now included in the beacon pages.
• SWAVES radio plots are now generated in realtime.
March 25, 2008 – Our first big success
Eruption in the Low Corona• A-B separation = 28 deg• Cadence = 10 min• Mild wavelet enhancement
Eruption in the Low Corona (Implications)
•Visibility of prominence top depends on projection
– Gap of several hours between A &B.– Height-time analyses of eruptive
prominences from single viewpoint are unreliable for CME studies!
•The existence of kinked structures is projection-depended
– “kinked” structure seen in B, not A– Footpoints of eruptive prominence seen in
B, not A– Shape, configuration of erupting structures
is very uncertain from single viewpoint.
Kinked structures
STEREO Actually ‘sees’ CIRs
90° 180°STEREO separation
STEREO into cycle 24
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