1 / 43

STEREO Today

STEREO Today. Status report presented by Janet Luhmann and Peter Schroeder for the ACE/STEREO/WIND/SOHO Workshop 2010 June 8-10, Kennebunkport

cynara
Download Presentation

STEREO Today

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. STEREO Today • Status report presented by • Janet Luhmann and Peter Schroeder for the • ACE/STEREO/WIND/SOHO Workshop • 2010 June 8-10, Kennebunkport • (Material drawn in part from this year’s STEREO Senior Review presentation by Joe Gurman, Toni Galvin and Bill Thompson-using material provided by the STEREO teams)

  2. STEREO Science Goals • To Understand the causes and mechanisms of Coronal Mass Ejection (CME) initiation • To Characterize the propagation of CMEs through the heliosphere • To Discover the mechanisms and sites of energetic particle acceleration in the low corona and the interplanetary medium • To Develop a 3D time-dependent model of the solar wind Pre-STEREO SOHO images

  3. STEREO investigations and measurements • SECCHI- Remote Sensing Package of imagers • Two White Light Coronagraphs (COR1,COR2)- COR1 explores 1.4 – 4 Rsun. COR2 explores 2 – 15 Rsun • Extreme Ultra Violet Imager (EUVI)- Observes chromosphere and inner corona • Heliospheric Imager (HI1, HI2)- Observes Coronal Mass Ejections from the Sun to the Earth (12 – 300 Rsun) • IMPACT- Samples the distribution of solar wind electrons, the characteristics of the energetic ions and electrons, and magnetic field. • Solar Wind Electron Analyzer (SWEA)-Measures ~0-3 keV electrons with wide angle coverage • Suprathermal Electron Telescope (STE)-Measures electrons from 2-100 keV with wide angle coverage • Magnetometer Experiment (MAG)-Measures the vector magnetic field at 65,536 nT and 500 nT ranges • Solar Energetic Particle Experiment (SEP) Suite (LET,SIT,SEPT,HET) • Measures electrons from 0.02-6 MeV • Measures protons from 0.02 – 100 MeV • Measures helium ions from 0.03 – 100 MeV/nucleon • Measures heavier ions form 0.03 – 40 MeV/nucleon • PLASTIC- Provides the plasma characteristics of protons, alphas, and heavy ions.including composition • SWAVES - in-situ as well as remote sensing instrument. Tracks CME Driven Shocks from the Corona to the Earth. Measures plasma waves.

  4. STEREO In-situ Investigation Concept

  5. The multipoint measurements complement the Sun-to-Earth images SECCHI Images from 3 June 2007 Venus Earth Moon (R. Howard image)

  6. Overlap of Views from HI1 and CORs

  7. STEREO whereabouts on June 3, 2010 STEREO’s location can be watched at the STEREO Science Center site stereo-ssc.nascom.gov

  8. Updates • The STEREO mission is in extended phase (has had two Senior Reviews) • Science Goals • Affected by low solar activity (few fast CMEs, SEPs) since launch in October, 2006 • Recent work emphasizes ‘quiet’ heliosphere • CIR/solar wind sources and structure analyses • Multispacecraft studies of small to moderate CMEs • Interplanetary magnetic field including shocks and waves and topology

  9. STEREO is doing its job of giving a whole Sun view SOHO EIT and SECCHI EUVI images (Bill Thompson, at SSC)

  10. But solar activity has been very low since launch, retargeting the main STEREO science activities somewhat MFSC solar website plot- D. Hathaway

  11. CME rates follow the sunspot cycle, but still occurred at this solar minimum at rates similar to previous cycle minimum (St. Cyr and Xie)

  12. Example of a Multi- spacecraft analysis of a magnetic cloud • 2007 November 19 – 21 • Interaction of a CIR and a magnetic cloud near the heliospheric current sheet Near-Earth (WIND) data and geomagnetic response

  13. Magnetic field maps obtained from Grad-Shafranov reconstructions; from solar E to W: STEREO B, WIND, STEREO A • Inferred Magnetic cloud magnetic field → Farrugia et al. 2010, submitted to JASTP (special CME/ICME volume)

  14. In 2010 CMEs are getting more frequent and energetic, and SEP events are returning • Multi-spacecraft SEP events observed on 2009/12/22, 2010/01/17; 2010/02/07, 08, 12 – when separation was > 130°

  15. Example: multipoint reconstruction of SEP events (Caltech) SOHO/LASCO Type III SOHO/EIT No Type III SWAVES SWAVES April 3-6, 2010 SEPT Flare at 9:04; Halo CME at 10:33 (C2) SEPT GOES PLASTIC PLASTIC ACE/EPAM No Shock + ESP event? Shock + ESP event Type III ACE/SWEPAM Shock + ESP event Wind/WAVES

  16. Scientific topics addressed, 2008-2009 • Stream/Corotating Interaction Regions (SIRs and CIRs) and associated energetic particles • Mapping/Tracking solar wind and IMF sources, including transient sources of slow solar wind • Ion cyclotron and other waves in the solar wind • Multipoint CME, ICME and SEP event analyses • Modeling of quiet corona, solar wind and transients • Energetic neutral atoms from solar events (flares and/or coronal mass ejections) and the magnetosphere • Small, impulsive He3 rich SEP events • Comet-solar wind interactions

  17. Scientific topics addressed, 2008-2009 (continued) • CMEs without solar surface source signatures • Reconnection in the solar wind • Interplanetary shocks structure and evolution • Interplanetary dust distribution and impacts • Imaging stream interaction regions seen in-situ • Coronal loops and dimmings- multiperspective studies • Anomalous cosmic ray gradients • Upstream (of bow shock) particle events • Planetary space weather applications • Quadrature space weather forecasting applications

  18. Publications Update • 2009 Solar Physics special issue appeared • JASTP special volume, Three Dimensional Aspects of CMEs, Their Source Regions, and Interplanetary Manifestations (Mierla, Srivastava, and Rodriguez, eds.) –due out by end of this year • Upcoming Solar Physics special issue on Whole Heliosphere Interval (WHI)

  19. STEREO Science Supporting Resources are Many • SSC provides Beacon images, plots, and access and/or links to data files (beacon and processed) • Investigator sites provide these plus much additional information: e.g. synoptic maps from imagers, movie makers, space weather information, links to instrument papers, etc. • Modeling sites provide results that can be used to connect what is seen in the images and at 1 AU (e.g. solar wind source mapping)

  20. http://secchi.nrl.navy.mil/spwx/ Space Weather Website includes events (D. Webb)

  21. (GONG website images below show open field regions and HSB) Example: GONG-based PFSS coronal field models and EUV image comparisons from SECCHI EUVI and SOHO EIT

  22. (WSA model results-NSWPC website) These models can also be used to map solar wind/IMF sources

  23. Proposed Science, FY11 - FY14 • Senior Review proposal lists 19 specific scientific objectives, all tied to the rise of solar activity cycle 24, including: • angular distribution and dependencies of SEP events • solar cycle modulation of anomalous cosmic rays reaching the ecliptic plane • Radio probing of the heliosphere before and after ICME passage 23

  24. To be aware of: Telemetry rates will be changing • At Senior Review Ahead was operating at 360 kbps, and Behind at 240 kbps. • Ahead switched to 240 kbps on April 26. • Switch to 160 kbps on 2010 September 13 on both spacecraft. • Switch to 120 kbps on Behind: 2010 Nov 15, Ahead: Apr 11 • Switch to 96 kbps in 2011 September for both spacecraft • Currently planning for switch to 30 kbps in 2012 August STEREO on 01 April 2011 (left) and 2012 (right)

  25. STEREO In Situ DataAccess

  26. Overview: Several Points of Entry • STEREO Science Center archives all primary instrument data. It also provides the real-time space weather beacon data, images and plots: http://stereo-ssc.nascom.nasa.gov/ • PI sites provide access to primary instrument data, some higher order data products, plots/browsers and lots of associated information about the instruments and the data : • IMPACT: http://sprg.ssl.berkeley.edu/impact/ • PLASTIC: http://stereo.sr.unh.edu/ • S/WAVES: http://swaves.gsfc.nasa.gov/ • Co-I sites provide additional tools, browsers and data in different formats (for example, ASCII): • UCLA: MAG data, “Level 2” (merged MAG and PLASTIC), “Level 3” (event lists): http://www-ssc.igpp.ucla.edu/ssc/stereo/ • Caltech: SEP suite browsers and data: http://www.srl.caltech.edu/STEREO/index.html • Toulouse: SWEA PAD and (limited) moments data: http://stereo.cesr.fr/ • Kiel: SEPT browser: http://www2.physik.uni-kiel.de/stereo/browseplots/ • CDAWeb serves a great deal of data and more is on the way: http://cdaweb.gsfc.nasa.gov/ • The Virtual Heliospheric Observatory (VHO) likewise serves some STEREO data and more is also in the pipeline: http://vho.nasa.gov/

  27. STEREO Science Center: http://stereo-ssc.nascom.nasa.gov/

  28. IMPACT Investigation Site: http://sprg.ssl.berkeley.edu/impact/

  29. PLASTIC Investigation Site: http://stereo.sr.unh.edu/

  30. S/WAVES Investigation Site: http://swaves.gsfc.nasa.gov/

  31. IMPACT Server at UCLA http://www-ssc.igpp.ucla.edu/ssc/stereo/ STEREO IMPACT L1 Magnetometer Data (1 Hz, 8 Hz, 32 Hz) • Earth orbit in GSM (Nov 7, 2006 – Oct 31, 2008) • Heliocentric orbit in RTN or spacecraft coordinates (Nov 7, 2006 – Mar 31, 2010) • Correlative: Wind/ACE mag data in RTN (1m, 1s) • Plots and ASCII data L2 Merged Magnetometer and PLASTIC Plasma Data (1 hour, 10 min, 1 min) • STA (Feb 15, 2007 – Feb 28, 2010) and STB (Mar 1, 2007-Feb 28, 2010) • Parameters: Vp, Np, Tp, entropy, beta, total pressure, Br, Bt, Bn, B, cone angle, clock angle, Br/B, Bt/B, Bn/B, spacecraft location • Plots and ASCII data L3 Event Lists (ICMEs, CIRs, Shocks) • Updated to Oct 31, 2009 • ICME parameters: start and stop time, maxima of total pressure, magnetic field, and solar wind speed, declining speed, group, and comments • SIR parameters: start and stop time, interface time, maxima of total pressure, magnetic field, proton number density, minimum and maximum solar wind speed • Shock parameters (using 8-Hz data): time, field ratio, shock normal angle, beta, Mach number, availability of 32-Hz data, forward/reverse shock

  32. IMPACT/SEP Suite Site: http://www.srl.caltech.edu/STEREO/

  33. IMPACT/SEPT site@Kiel:http://www2.physik.uni-kiel.de/stereo/browseplots/

  34. IMPACT/SWEA@Toulouse: http://stereo.cesr.fr/

More Related