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Panel Discussion Groups D, E, F, & G

Panel Discussion Groups D, E, F, & G. Solar Cycle 24 Workshop Napa, CA 12 December, 2008. Panel Members. Group D – Global Energetics Dick Mewaldt / Brian Dennis Group E – Flares Eduard Kontar Ryan Milligan Albert Shih Group F – CMEs Meredith Miles-Davey James McAteer

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Panel Discussion Groups D, E, F, & G

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  1. Panel DiscussionGroups D, E, F, & G Solar Cycle 24 Workshop Napa, CA 12 December, 2008

  2. Panel Members • Group D – Global Energetics • Dick Mewaldt / Brian Dennis • Group E – Flares • Eduard Kontar • Ryan Milligan • Albert Shih • Group F – CMEs • Meredith Miles-Davey • James McAteer • Group G – Microflares • Steven Christe • Iain Hannah

  3. Group D - Global Energetics • Available Magnetic Energy 100% • Flare Energy • Total radiated energy 10% • GOES Thermal 1% • Electrons 1% • Ions 1% • CME 10% • Potential 1% • Kinetic 9% • SEPs 1% • Protons • Heavies

  4. TSI and VUV Radiative Energies During X-Class Solar Flares Chris Moore Undergraduate Student U. of Iowa (2 summers at LASP/U. of Colorado) Phillip Chamberlin, Rachel Hock, Greg Kopp LASP/U. of Colorado 9/24/2014 Moore - Onset of SC 24

  5. TIM/TSI scaling • Accuracy of 100 ppm (0.01%)

  6. Relationships 9/24/2014 RHESSI Workshop - Potsdam 7

  7. Future Improvements Continuing measurements • SORCE TIM New measurements • TSI • GLORY TIM (launch July 2009) • Imaging observations???? • GONG to correct for p-mode noise???? • VUV • SDO EVE (launch Mid-2009 to early 2010) Modeling • Flare Irradiance Spectral Model (FISM)

  8. Mewaldt et al.

  9. Group G - Microflares • All flares are the same • Nano, micro, and “real” flares • Active region related • Flows • Nonthermal component • Polar jets • Size distribution of flares • Flatter than 2

  10. Group G – Microflares & Nanoflares XRT Polar bright points and jets J. Cirtain XRT Nanoflares P. Grigis Evaporation in microflares J. Brosius & R. Milligan

  11. Morphology of microflares T. Shimizu RHESSI Microflare Statistics S. Christe & I. Hannah Nonthermal particles in nanoflares. Q. Chen Current sheets form readily Å. Janse

  12. Impulsive energetic release (nanoflare, microflare, XBP, X class flare) are all the same. Its all a matter of scale and energy.

  13. HXR microflares/nanoflares do not heat the corona. RHESSI Microflare Statistics I. Hannah & S. Christe RHESSI Quiet Sun Flux I. Hannah

  14. Group E - Flares • Coronal hard X-ray sources - MARCO • Source sizes & expanding magnetic fields • Velocity vs. temperature & chromospheric evaporation • Need for continuous Hinode observations • Gamma-ray spectra • Alpha/proton ratio • Proton spectrum

  15. Non-thermal coronal sources Number of nonthermal (accelerated) electrons must be of the same order as ambient thermal electrons or larger= > purely nothermal source? => acceleration region ? => EIS ratios to determine pre-flare densities?

  16. MAgnetic Reconnection in the COrona (MARCO) Science Objective Understand the physics of the magnetic reconnection in the corona that initiates the release of energy for solar flares and coronal mass ejections (CMEs), and that leads to solar energetic particle (SEP) acceleration. Observational Objectives Measure the temperature, density, and magnetic field in reconnection regions and follow their spatial/temporal evolution Measure the density, speed, and direction of the slow (0.010.1 VA) and fast (~VA) plasma flows associated with reconnection Locate electron and ion acceleration regions Characterize the seed population for accelerated ions Determine the energy spectra and angular distributions of the accelerated electrons and ions, and their spatial/temporal evolution Determine the three-dimensional density structure, initiation time profile, and velocity of the shocks that accelerate SEPs Characterize the partition of energy amongst the various manifestations of energy release Associated RFAs:F1, F2, H1, J2, J3 Left: RHESSI/TRACE observations of gamma-ray line (blue) & hard X-ray continuum (red) footpoints straddling the flare loops, revealing both ion & electron acceleration related to reconnection. Right: HINODE XRT image sequence showing evidence of magnetic reconnection. • Mission Implementation • With the next generation of instruments it will be possible to probe reconnection, transient energy release, and particle acceleration in the corona. Simultaneous comprehensive measurements by multiple space instruments are needed, in conjunction withground-based instruments (e.g., ATST and FASR) to measure coronal magnetic fields, morphology, etc. • MARCO combines the necessary space instrumentation on a single 3-axis stabilized spacecraft with an extendable ~20 m boom, in a low-Earth orbit. • Total payload resources: ~2000 kg / 1500 W / 1 TB per day • Operation during solar cycle 25 starting in ~2020 • Instrument Payload • To be determined from a science & technology definition team study, with many possibilities described in other quad charts in this Roadmap(e.g., RAMM, FOXSI, GRIPS, GRAPE, FACTS, UVSC, COMPASS). • Key Measurements & Candidate Instruments • Coronal magnetic fields • ATST (Advanced Technology Solar Telescope), • FASR (Frequency Agile Solar Radio observatory) • EUV vector magnetograph • Plasma density, temperature , and flows • Soft X-ray imaging spectrometer • EUV/UV imaging spectrograph • UV spectrometer/coronagraph • White-light imaging coronagraph • Suprathermal seed particles • UV spectrometer/coronagraph • Focusingoptics hard X-ray spectroscopic imager • Energetic electrons and ions • Focusingoptics hard X-ray spectroscopic imager • Gamma-ray imaging spectro-polarimeter • Neutron spectrometer

  17. Hinode flare operations => High temperature (T> 10 MK) line profiles of from Hard X-ray footpoints are predominantly stationary => weak evaporation?

  18. Hinode flare operations => Continuous observations of an active region to have flare observations from the start to the end =>Not to rely on “flare trigger mode”

  19. Magnetic field structure from RHESSI Hard X-rays 22-29 keV 43-75 keV 18-22 keV 29-43 keV 75-250 keV => Magnetic field structure in the chromosphere => direct measurements of canopy heights? 1’’

  20. Element abundances from gamma lines => Average ambient Mg and Fe abundance ratio consistent with photospheric abundances while ambient Si abundance appears to be closer to coronal. No consistent low FIP enhancement. => Average accelerated heavy ion (Ne, Mg, Si, and Fe)/O abundance ratio consistent with corona and photosphere but not impulsive SEPs. => New average accelerated alpha/proton ratio (~0.15 ) is elevated.

  21. Flare gamma-ray observations • Controversial statements? • The flare acceleration of ions and electrons to high energies is directly proportional, but they interact at spatially separate locations. • The ambient abundances are photospheric rather than coronal, and the flare-accelerated abundances do not agree with impulsive SEPs. • New tools: TALYS, instrument response models • New instruments: FGST, GRIPS, and others

  22. Final comment:The number problem still unsolved for thirty years?

  23. Group FOutstanding CME Science Questions • How do we explain CME initiation? • Relating models/simulations to data • “Problem events” • How do CMEs relate to other origins phenomena? • Flares, filaments, dimming regions, coronal waves • How do CMEs evolve? • Acceleration/deceleration • 3D Kinematics

  24. CME Wish List • Better data (future instruments) • High cadence EUV (AIA) • Imaging spectrograph • Low-corona coronagraph • Vectormagnetograph (HMI) • Analysis methods • Quantitative analysis! • Large-scale statistical studies • “Cradle to grave” case studies • Meaningful metadata • Automated metadata extraction

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