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Active Region Loop Studies in Oslo

Active Region Loop Studies in Oslo. Olav Kjeldseth-Moe and Terje Fredvik Institute of Theoretical Astrophysics University of Oslo. Prehistory …. AR loops on east limb with LABP2W on 27 July 1996 First detection of large velocities in AR loops, 50 km/s

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Active Region Loop Studies in Oslo

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  1. Active Region Loop Studies in Oslo Olav Kjeldseth-Moe and Terje Fredvik Institute of Theoretical Astrophysics University of Oslo CDS Session NAM Dublin April 2003

  2. Prehistory … • AR loops on east limb with LABP2W on 27 July 1996 • First detection of large velocities in AR loops, 50 km/s • Brekke, Kjeldseth-Moe and Harrison, Solar Physics 175, 511-521,1997 CDS Session NAM Dublin April 2003

  3. CDS Session NAM Dublin April 2003

  4. Next … • A program was started, to follow up on study of high velocities in active region loops, to see whether they were a common property of loops • Initial observations with EJECT_V3 on 14 September 1997 • EJECT_V3: Rasters 240” X 240” full coverage, cadence: 17 minutes 6 lines including O V 629 Å CDS Session NAM Dublin April 2003

  5. Pronounced time variability • Rapid changes occur e.g. in less than 17 min, the cadence • Even in a long lasting (t > 3 h) loop system the change will be sudden, i.e. less than the time between two rasters • Loops at different transition region temperatures are co-located CDS Session NAM Dublin April 2003

  6. Co-location of loops CDS Session NAM Dublin April 2003

  7. O_LOOP: General information • NIS and GIS studies designed for studying active region loop structures outside the limb • Observations have been part of several JOPs (e.g. JOP 75 and JOP 137), involving TRACE, SUMER, EIT and MDI, but have also run many times by themselves, i.e. with CDS only • More than 95% of the data obtained during campaigns have been processed • Present emphasis is on determining the temperature demarcation separating “strong” and “weak” activity in loop plasmas CDS Session NAM Dublin April 2003

  8. Oslo Active Region Studies O_LOOP1 – “high” cadence raster – the workhorse of the program O_LOOP2 – “context” raster with good temperature coverage O_LOOP3 - wide slit giving hyper fast monochromatic images at three wavelengths O_LOOP4 - same as O_LOOP1 with the slit staying in one position, for time studies O_LOOP5 - very high cadence raster (incomplete area coverage, stripes) O_LOOP10 and O_LOOP11 – GIS observations for improved temperature coverage at 0.5 MK CDS Session NAM Dublin April 2003

  9. Oslo Active Region Studies (2) Study Data Slit Step FOV Exp. Cadence First Number Name window # size time run of runs l x y (as) (as) (s) (m:s) ============================================== O_LOOP1 15x143 5 4 160x240 10 10:30 97/11/13 139 O_LOOP2 32x143 5 4 160x240 60 45:45 97/11/13 91 O_LOOP3 90x89 6 - 90x150 6 0:22 97/11/13 5 O_LOOP4 15x143 5 - 4x240 10 0:15 00/10/24 2 O_LOOP5 15x143 5 8 60x240 10 2:02 00/10/23 24 --------------------------------------------------------------- O_LOOP10 2048 (l) 2 - 4x4 30 0:32 02/03/12 4 O_LOOP11 2048 (l) 2 - 4x4 60 0:62 02/03/12 8 ============================================== CDS Session NAM Dublin April 2003

  10. Wavelength list Ion l (Å) T(K) #1 #2 #3 #4 #5 #10/11 ===================================== He I 584 10 000 x x x x x O III 599 100 000 x x x x O VI 554 150 000 x O V 567 230 000 x O V 629 230 000 x x x x x Ne VI 562 430 000 x x x x Ne VII 465 515 000 x Mg VII 319 645 000 x Mg IX 368 950 000 x x x x x Mg X 624 1 120 000 x Si IX 345 1 250 000 x Si X 347 1 580 000 x Si X 356 1 580 000 x Fe XIV 353 2 000 000 x Si XII 520 2 000 000 x Fe XVI 360 2 700 000 x x x x CDS Session NAM Dublin April 2003

  11. Number of runs CDS Session NAM Dublin April 2003

  12. O_LOOP1 - Product CDS Session NAM Dublin April 2003

  13. O_LOOP3 CDS Session NAM Dublin April 2003

  14. Loop motions from EIT CDS Session NAM Dublin April 2003

  15. O_LOOP5: Raster CDS Session NAM Dublin April 2003

  16. O_LOOP5: raster & movie CDS Session NAM Dublin April 2003

  17. Time variations 0.23-0.65 MK CDS Session NAM Dublin April 2003

  18. Data reduction • Data are always processed with the latest CDS software, i.e. the Component Fitting System (see CDS SW Note #47) • Performs line profile fitting, allowing: a) interactive fitting of line profiles b) detailed inspection of the results c) automatic processing of large data sets • An analysis definition (ADEF) is made for each line in each CDS study and used to process all observations of that study • The ADEF contains: all line profile parameters, plus keywords describing calibrations to be performed, and units of result • Profiles are assumed to be Gaussian; parameters include intensity, line shift and line width • ADEF may be adjusted locally in regions with non-typical line parameters • Final product: Parameters of fitted profile at each image element CDS Session NAM Dublin April 2003

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