Number: JOP029 JOINT CDS/SUMER PROGRAMME Filament Flows with SUMER and CDS Authors: O. Engvold, J. Zirker, A. Poland Introduction: The source of mass for quiescent filaments is still an open question. According to current thinking, the mass is injected from the chromosphere, possibly along the long appendages ("feet" or "barbs") rather than by condensation of coronal matter. Indeed, recent observations by S. Martin and O. Engvold based on high-resolution H-alpha filtergrams, supports this view. The purpose of this program is to acquire SUMER and CDS spectra to test this idea further. Doppler velocities in selected lines formed at different temperatures will be observed in a suitable filament with SUMER. Intensity variations and Doppler velocities of lines covering a larger range in temperature, in the transition region and vicinity of the filament, will be observed with CDS to search for evidence of cooling of coronal plasma and collapse into the filament. Transverse and line-of-sight flows in filament fine structure and associated filament channel will be searched for in simultaneous high-resolution images from ground-based observatories. CDS Study Detail Phase 1 - ------- Spectrometer: Normal Incidence Slit: 2 x 240 arcseconds Raster Area: 120 x 240 arcseconds Step (DX,DY): 2 arcseconds, 0 arcseconds Raster Locations: 60 x 1 = 60 Exposure Time: 30 seconds Duration of Raster: 2084 seconds Number of Rasters: 5 Total Duration: 10420 seconds Line Selection: Mg IX 368.06, O III 525.80, He I 537.03 Ne VI 562.83, He I 584.33, O III 599.59, Mg X 624.94, O V 629.73 Bins Across Line: 21 Telemetry/Compression: truncate to 12 bits Pointing: To pre-planned location (Filament) Flags: No flag during this study Solar Feature Tracking: On Frequency: Product Five 120 x 240 arcseconds rasters Total duration 173.7 minutes Joint Observation SUMER If possible, it is desirable that the start of each scanning sequence is coordinated with the star of each new sequence with SUMER. Parameter List for SUMER Study: jop029 Item # 0 ------------------------------------------------- You have selected (Irrelevant points are not listed.): 1. Interruption or flag mode: No interruption. 2. Slit 7 (centred) with 0.3*120 arcsec^2. 3. Point to FILAMENT SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 5. Quasilog_min_max (0.92 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: ON Ion(s) in band 1: VIRTUAL .... 990.296 Angstroem Spectral window(s) (pixel): 1024 8. Image format: Format #4 (1024*120, B1); 1 time(s) 9. Spectrohelio mode: Spectrohelio 3 Integration time: 100.000 s Step size: 0.00000 arcsec or 0 units. Image number: 1.00000 17. Your selection requires a mean telemetry rate of: 9.83040 kbit/s Available bitrate: 10.0000 kbit/s This item will run for approximately: 1.68480 minutes and will cover a solar area defined by 120 px time(s) 0.00000 arcsec Note that the memory monitoring and the run times are not very accurate. The run times just give the total exposure times with a margin of 1%, but the grating focus adjust time is included. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 1.68480 minutes You will use for this item: 0.122966 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.122966 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: jop029 Item # 1 ------------------------------------------------- You have selected (Irrelevant points are not listed.): 1. Interruption or flag mode: No interruption. 2. Slit 7 (centred) with 0.3*120 arcsec^2. 3. Point to FILAMENT SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 5. Quasilog_min_max (0.92 s). 7. Reference pixel 1: 810 on detector A Flat-field correction: ON Ion(s) in band 1: C III .... 977.020 Angstroem H I .... 972.537 Angstroem Spectral window(s) (pixel): 50 8. Image format: Format #10 (50*120, B1); 2 time(s) 9. Spectrohelio mode: Spectrohelio 3 Integration time: 4.00000 s Step size: 1.14000 arcsec or 3 units. Step number: 105 Step mode: Normal steps Repetition number: 1 Staggering: 1 17. Your selection requires a mean telemetry rate of: 24.0000 kbit/s Available bitrate: 10.0000 kbit/s This item will run for approximately: 7.29257 minutes and will cover a solar area defined by 120 px time(s) 119.700 arcsec Note that the memory monitoring and the run times are not very accurate. The run times just give the total exposure times with a margin of 1%, but the grating focus adjust time is included. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 8.97737 minutes You will use for this item: 0.770829 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.888794 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: jop029 Item # 2 ------------------------------------------------- You have selected (Irrelevant points are not listed.): 1. Interruption or flag mode: No interruption. 2. Slit 4 (centred) with 1*120 arcsec^2. 3. Point to FILAMENT SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 5. Quasilog_min_max (0.92 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: ON Ion(s) in band 1: VIRTUAL .... 1160.70 Angstroem Spectral window(s) (pixel): 1024 8. Image format: Format #4 (1024*120, B1); 1 time(s) 9. Spectrohelio mode: Spectrohelio 3 Integration time: 100.000 s Step size: 0.00000 arcsec or 0 units. Image number: 1.00000 17. Your selection requires a mean telemetry rate of: 9.83040 kbit/s Available bitrate: 10.0000 kbit/s This item will run for approximately: 1.68480 minutes and will cover a solar area defined by 120 px time(s) 0.00000 arcsec Note that the memory monitoring and the run times are not very accurate. The run times just give the total exposure times with a margin of 1%, but the grating focus adjust time is included. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 10.6622 minutes You will use for this item: 0.122966 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.886760 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: jop029 Item # 3 ------------------------------------------------- You have selected (Irrelevant points are not listed.): 1. Interruption or flag mode: No interruption. 2. Slit 4 (centred) with 1*120 arcsec^2. 3. Point to FILAMENT SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 5. Quasilog_min_max (0.92 s). 7. Reference pixel 1: 330 on detector A Flat-field correction: ON Ion(s) in band 1: HE I .... 584.334 Angstroem O I .... 1152.15 Angstroem Spectral window(s) (pixel): 50 8. Image format: Format #10 (50*120, B1); 2 time(s) 9. Spectrohelio mode: Spectrohelio 3 Integration time: 15.0000 s Step size: 1.14000 arcsec or 3 units. Step number: 105 Step mode: Normal steps Repetition number: 1 Staggering: 1 17. Your selection requires a mean telemetry rate of: 6.40000 kbit/s Available bitrate: 10.0000 kbit/s This item will run for approximately: 26.9202 minutes and will cover a solar area defined by 120 px time(s) 119.700 arcsec Note that the memory monitoring and the run times are not very accurate. The run times just give the total exposure times with a margin of 1%, but the grating focus adjust time is included. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 37.5824 minutes You will use for this item: 0.00000 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.160022 MB out of which 0.00000 MB are for uncompressed images. At the end of the study you have to allow for approx. 1.04986 min to clear the memory. An integration time of approx. 16.9425 s would result in an empty memory at the end of the study. This study ends in a wavelength range (converted to 1st order) shorter than Lyman alpha. THE SUMER STUDY SHOULD BE REPEATED 5 TIMES WITH A TOTAL DURATION OF 187.9 MINUTES Coordinated Ground-based Observations We will carry out simultaneous Doppler velocity observations of the chosen filament at the Swedish Observatory at La Palma and the Sacramento Peak Observatory.Time series of images and spectra would be taken in H alpha (0,+-0.5 A) and a magnetically insensitive photospheric line (e.g. Fe I 5576). We could potentially obtain images of higher resolution (subarcsecond) than are available from SUMER. The combination of EUV data and ground-based data should help to clarify the question of the origin of the filament mass.