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Michael L. Kaiser
STEREO Project Scientist
NASA/Goddard Space Flight Center
STEREO
June 11, 2008
STEREO at 1.4 years
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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
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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.
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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/
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Comets Lose Their Tails
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EUV Wave Structure/Evolution• First EUV wave with
– High cadence (< 2.5 min)– Multi-temperature (4 wavelengths within
minute)– Stereoscopic (EUVI-A, -B, EIT)
• A-B separation = 42 deg
• Cadence = 2.5 min
• Mild wavelet enhancement
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EUV Wave Structure/Evolution (Implications)
• Loops start to rise @ 04:21:00 UT– 10 min BEFORE wave
• Wave appears @ 04:28:30 UT
– No flare, no CME!
– Connection between wave & rising loops?
• Flare ribbons appear @ 04:31:00 UT
– Wave accelerates?
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Eruption in the Low Corona• A-B separation = 28 deg• Cadence = 10 min• Mild wavelet enhancement
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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
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STEREO Actually ‘sees’ CIRs
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90° 180°STEREO separation
STEREO into cycle 24
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