SDO/AIA science plan: prioritization and implementation: Five Objectives in 10 steps C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb I: C4/C6/M8: Coronal Energy Inputs Chair(s): Tom Metcalf, Karel Schrijver Status: draft III (2006/01/11) With comments from Eric Priest, Pascal Demoulin, Aad van Ballegooijen, Tom Metcalf & Karel Schrijver

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb Guidelines to group leads Assess the task definitions in appendix A (‘AIA Science Plan’) in the 2004 Concept Study Report (CSR). In particular: Science/task descriptions in Ch. A1.1 Summaries in Table A2 Identify required changes from, and additions to, the ‘AIA Science Plan’ Evaluate the status of that plan, and formulate changes, if needed. You may add as many pages to this document as you need, but: Add pages under the same headings: please, do not change the roman numerals in the page titles, please add ‘a, b, c, d, …’ Resources: AIA home: AIA CSR summary: CSR: Proposal:

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb Schedule 17 November 2005: draft sheets I, II to teams, requesting input for sheets III and IV 24 November 2005: completed sheets I-IV for review to teams, requesting input for sheets V-VI 8 December 2005: team input received for sheets V-VI 19 December 2005: draft of sheets VII-VIII to teams 9 January 2006: team comments received for sheets VII-VIII 6 February 2006: draft ‘Science plans’ on meeting website, with sheets IX-X filled out by team leads (or teams after telecons) February 2006: discussions during science team meeting discuss and complete pages IX-X. 17 February: completed ‘Science plans’ on line.

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb Session(s) outline: Topical discussions, introduced by speakers & chairs, followed by ‘all’ Session C4:  Task 1A: determine the 3D configuration of the coronal field Aad van Ballegooijen on ‘general modeling’  Task 1B: measure and map the magnetic free energy Jon Linker on ‘feeding models’, and Brian Welsch on ‘free energy’ Session C6:  Task 1C: evolution of the field towards unstable configurations Ed DeLuca on ‘required observational data and derivatives’, Bill Abbett on ‘model of developing instabilities’  Task 1D: determine the life-cycle of atmospheric field Alan Title on ‘flux life cycle’, and Alex Pevtsov on ‘helicity life cycle’ Followed by a discussion, assessment, and ‘completion’ of this ppt file.

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb II: Science questions and tasks Primary scientific questions: Determine the gradual evolution of field geometry/connectivity, and measure the energy in the field during emergence, evolution in the atmosphere, and disappearance from the Sun. SDO/AIA science tasks: Task 1A: determine the 3D configuration of the coronal field Task 1B: measure and map the magnetic free energy Task 1C: study the evolution of the field towards unstable configurations Task 1D: determine the life-cycle of atmospheric field

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb IIIa: Science context Expected advances in prior to SDO: [discussed in C2] NLFFF modeling (computational speed, effects of boundary & initial conditions, …)  Measurement/mapping of free energy in AR coronae  Use of H  and chrom. magnetograms in field modeling/extrapolations  Use of spherical coordinates, if not global models (embedded in potential environment) Learn to interpret/use ‘relative helicity’ Field, current (helicity) emergence and coronal field in AR cores (Solar-B FPP & XRT) High-coronal stereoscopy (STEREO)

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb IIIb: Science context Anticipated SDO contributions: Improved AR field geometry because of narrower pass bands (lower filling factors) AR field reconnections studied with improved spatial and thermal resolution Long-term AR and filament evolution: all targets visible for full disk passage Interactions between active regions (low-T corona) Flux dispersal into quiet Sun and associated reconnections (low-T corona) Comparison of full-sphere field models with coronal observations may allow identification of large current systems in the high corona outside active regions Quiet-Sun filaments (low-T corona) and other field evolution Complement (rejuvenate?) the STEREO mission by AIA’s ‘third eye’ at mid- angle Measurement of magnetic helicity

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb IVa: Science investigation Hurdles, bottlenecks, uncertainties:  NLFFF modeling codes many orders of magnitude too slow.  High (obs. & model) resolution needed to accommodate gradients in .  Can NLFFF models deal with highly sheared field?  Is the 180-degree ambiguity problem adequately solved/solvable?  Limited availability of chromospheric vector-magnetography  Need automatic, reliable loop tracing algorithm  How to view the 6 EUV channels and HMI vector magnetograms?  Metric for correspondence of field model and observed corona to be developed.

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb IVb: Science investigation Hurdles, bottlenecks, uncertainties:  Metric for correspondence of field model and observed corona to be developed.  How to determine, and then use, the quantity called ‘relative helicity’?  How to measure the various contributions to the Poynting flux?  How can EIS spectroscopy be combined with AIA imaging for 3D geometry studies?  Can reconnection rates be measured if no (unique or verified) field model is available?  H  images needed for chromospheric field info. (particularly for filament/prominence and sunspot-field studies)  Are complementary sets of ‘isothermal’ images from DEM inversion more useful than the filter images themselves? If so, how are such isothermal images created, given uncertainties and incompleteness of spectral codes?

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb Va: Implementation: general [What do we need to make progress on the science questions in general?] [Working groups]  Coordination between GBOs and Space-Based Obs. (Solar-B: FPP and EIS (3D motions), …). Perhaps have ‘All Resource’ programs for pre-defined windows in time, following/negotiating common targets  Vector-velocity determination (to measure relative helicity flux and to help determine Poynting flux)

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb Vb: Implementation: general [What do we need to make progress on the science questions in general?] [Science stimuli, funding, …]  NLFFF code speed and resolution: high resolution is essential to accommodate strong shear; large number of pixels is needed to model multi-AR interacting fields or large-scale filaments.  180-degree ambiguity resolution: algorithm speed; options to start from a previous vector-magnetogram.  Funding for (one or more?): GBO chromospheric vector magnetograms Solar-B and/or GBO H 

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb Vc: Implementation: general [What do we need to make progress on the science questions in general?] [SR&T/TR&T/…] [observables, models, codes, resources, people …]  NLFFF model tests on synthetic data  Chromospheric field information ([vector]B, Halpha, …)  Solar-B EIS data for 3D flow determination …

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb VI: Implementation: AIA+HMI [What do we need from and for SDO to make progress on our major science?] [observing programs/sequences]  Flare (-response[?]) mode to infer reconnection rates [data products]  Vector magnetograms [cadence?]  Carefully aligned magnetograms and coronal image sets (for model boundary conditions and for loop tracing) [turnaround time] [frequency] …

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb VII: AIA (+HMI+EVE) data products [list data products; differentiate ‘critical’, ‘desirable’, ‘useful’] SDO data:  NLFFF model result or tool? Global or local? Frequency?  … Supporting data from other observatories:  …

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb VIIIa: AIA (+HMI+EVE) data production Assessment of required resources/codes/etc: [pipeline software]  3D NLFFF products - or provide ‘supporting software’?  Loop coordinates - or loop-tracing algorithm?  Image alignment for HMI int. and (vector-)B and all AIA channels [analysis software/studies] [supporting software/models]  3D NLFFF model software - or provide data products?  Loop-tracking algorithm - or data product?

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb VIIIb: AIA (+HMI+EVE) data production Assessment of required resources/codes/etc: [computational requirements (run time estimates, system requirements, …)] [storage requirements: size, duration, …] [access: web, archive, logs, search methods, …]

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb VIIIc: AIA (+HMI+EVE) data production Assessment of required resources/codes/etc:  Visualization tools to show:  computed potential fields  compare computed vector fields with observed fields at photospheric and chromospheric levels  display magnetic field, current density, and alpha parameter in any 2D slice through 3D model  trace field lines in 3D model from manually selected "starting" points  find magnetic null points and (quasi-)separatrix surfaces  show field lines and nulls from other (non-SDO) view angles to gain understanding of magnetic geometry  overlay projected field lines and nulls onto AIA or other images for comparison with observed coronal structures  quantify correspondence between field lines and coronal loops  compute magnetic helicity and free energy

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb IX: Business plan: Resources [What data and codes must we have to make SDO a success (at pipeline, supporting, and research levels)? Who will provide the required codes?] On ‘critical path’:  Funding for field modeling algorithms, testing of these algorithms, and maintenance for general use (perhaps a dedicated processor cluster?)  Funding and infrastructure for complementary data, specifically chromospheric (vector-)magnetograms and H  imaging

C4/C6/M8HMI/AIA science teams meeting; Monterey; Feb X: Business plan: Implementation [Define key milestones, test procedures, and target dates, …] … [Communication: define or list meetings, topical sessions, etc., where progress can be presented, discussed, evaluated, …] …