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First FLAG Workshop

First FLAG Workshop. Overview of where we stand Summary of results to date Future objectives for the group A Topical Issue in Solar Physics?. The Group. 21 members from 12 institutions Primary FLAG Hare & Hounds Exercise (FLAGhh01, frequency splittings) Other ‘spin-off’ projects:

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First FLAG Workshop

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  1. First FLAG Workshop • Overview of where we stand • Summary of results to date • Future objectives for the group • A Topical Issue in Solar Physics?

  2. The Group • 21 members from 12 institutions • Primary FLAG Hare & Hounds Exercise (FLAGhh01, frequency splittings) • Other ‘spin-off’ projects: • F. Baudin: extraction of estimates of acoustic forcing of modes • S. Fletcher: Fitting in the time domain • N. Seghouani: Spectral Estimates

  3. FLAGhh01 • Main FLAG dataset FLAG_021_nw_025 • Artificial Sun-as-a-star, Doppler-like data • Approximately 9.5 yrs, on 40-s cadence • 10 Hounds fitted the data: WJC analysed returned estimates of mode splittings

  4. FLAG Hare & Hounds Fitted minus input splitting...

  5. FLAG Hare & Hounds Fitted minus input splitting...

  6. FLAG Hare & Hounds Fitted minus input splitting...

  7. FLAG Hare & Hounds Independent Realizations of main dataset

  8. FLAG Hare & Hounds Normalized scatter between independent sets

  9. FLAG Hare & Hounds Normalized scatter between hounds (main set)

  10. FLAG Hare & Hounds Effect of changing fixed m-component H ratio

  11. FLAG Hare & Hounds Effect of changing fixed m-component H ratio • Are differences between hounds due to assumed height ratio differences? • Test by fitting splittings of hounds at each (l,n) as function of  • Here, the dummy variable j tags the results of each hound

  12. FLAG Hare & Hounds Are different  responsible for differences? Dotted line prediction from varying  only

  13. Future Objectives: FLAGhh01 • Complete and submit splitting work? • Get the hounds to fit with the same m-component height ratios • Which journal? • WJC to write and circulate for comment/revision to all?

  14. Future Objectives: New Parameters? • Which parameters do we tackle next? • Working structure: • There should be spin-off programmes where individuals use data to help their own investigations • Also, a centrally co-ordinated Hare & Hounds programme (e.g., FLAGhh02 could look at frequencies)

  15. Future Objectives: A Topical Issue in Solar Physics? • Motivation: • To demonstrate the importance of coordinated activity of this type to the community • To demonstrate widely the vigorous programme on-going in the global, low-l area • Timeliness: links to asteroseismology of solar-like stars

  16. Future Objectives: A Topical Issue in Solar Physics? • We could do a joint issue with the asteroseismology community (H&H activity is on-going in this area) • Can have: • Topical Issue (whole volume, or half volume/issue) • Topical Section (some smaller fraction of an issue)

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