1. Michael L. Kaiser STEREO Project Scientist NASA/Goddard Space Flight Center STEREO June 11, 2008 STEREO at 1.4 years

2. STEREO-B (BEHIND) OBSERVATORY Deployed SWAVES Electric Field Antenna (3 places) Deployed IMPACT Boom IMPACT Solar Wind Electron Analyzer (SWEA) IMPACT Suprathermal Electron Detector (STE) IMPACT Magnetometer (MAG) SECCHI Heliospheric Imager (HI) SECCHI Sun-Centered Imaging Package (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

3. STEREO Orbits Sun Earth Ahead @ +22  /year Behind @ -22  /year Heliocentric Inertial Coordinates (Ecliptic Plane Projection) Geocentric Solar Ecliptic Coordinates Fixed Earth-Sun Line (Ecliptic Plane Projection) Ahead Behind Earth 1 yr. 2 yr. 3 yr. 4 yr. 1yr. 2yr. 3 yr. 4 yr.

4. STEREO Space Weather Data Products Highest resolution data – available 24-48 hrs SECCHI: 2048 X 2048 images IMPACT: fluxes (10s sec), moments (few sec) and B (<1 sec) PLASTIC: fluxes and moments 1 min resolution SWAVES: intensities from all frequencies (~367) every 15 sec Other data products – available TBD Key parameters Catalogs and event tables Movies Research Beacon (space weather) data – available ‘immediately’ SECCHI: ~7 256 X 256 images every hour IMPACT: 1 min aves of B, 1 min aves solar wind moments and selected SEP fluxes PLASTIC: 1 minute resolution selected moments and fluxes SWAVES: 1 minute summaries of alternate frequencies (0.1-16 MHz) ‘Operational’ http://stereo-ssc.nascom.nasa.gov/beacon/

5. Comets Lose Their Tails

6. 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

7. 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?

8. Eruption in the Low Corona A-B separation = 28 deg Cadence = 10 min Mild wavelet enhancement

9. 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

10. STEREO Actually ‘sees’ CIRs

11. 90 ° 180 ° STEREO separation STEREO into cycle 24

12. Click here to be dazzled

13. http://stereo.gsfc.nasa.gov or http://www.nasa.gov/stereo