Joint CDS/SUMER Observing Programme Nature of Non-Thermal Line Broadening Paal Brekke & Per Maltby, ITA, University of Oslo Jack Ireland & Eric Priest, The University, St Andrews Scientific justification It is well known that spectral lines formed in the transition region and corona show a non-thermal line broadening that varies with the line formation temperature. The nature of the line broadening is less clear since turbulent motion, unresolved fine structure and wave motion may each cause spectral line broadening. One should note that turbulent motions in a magnetic field may deviate from isotropy. Hence, although centre-limb observations may help in discriminating between turbulence and wave broadening ambiguities may result. In some transition region locations the spectral lines are observed to show more than one distinct line-of-sight velocity within the same line profile, suggesting the presence of a fine structure in the flow field (Kjeldseth-Moe et al. 1993). Wave motions influence spectral lines in characteristic ways and leave signatures in the spectral lines that may be used to discriminate between turbulence and wave broadening and also between different wave modes. Compressional waves, such as sound-, magnetoacoustic- and shock waves give rise to spectral line shifts and line asymmetries (Eriksen & Maltby 1967; Maltby 1968). Pure Alfv{\'e}n waves give symmetrical line broadening (Maltby 1968a), unless the wave pulse is large enough to produce a wavelength shift in the spectral lines (Hansteen & Maltby 1992). Hence, signatures of wave motion in the transition region may be detected from line shapes and line shifts, but more unambiguously by detecting oscillations in the wavelength position. Transition region line-of-sight oscillations have so far only been observed in sunspot regions (Gurman et al. 1982). Long exposure times prevent us from detecting wavelength oscillations in off the limb observations, except for very low wave frequencies. This study aims at searching for wavelength oscillations and other wave signatures in bright lines observed on the solar disk. In order to study the origin of the spectral line broadening we propose to observe with high time resolution. Furthermore, nearly simultaneous information about the spatial variation is required, both for interpretation purposes and for discriminating between spacecraft jitter and real spatial/temporal variation. Eriksen, G. & Maltby, P. 1967 ApJ 148, 833 Gurman, J.B., Leibacher, J.W., Shine, R.A., Woodgate, B.E. & Henze, W. 1982 ApJ 253, 939 Hansteen, V.H. & Maltby, P. 1992 Comments on Astrophys. 16, 137 Kjeldseth-Moe, O., Brynildsen, N., Brekke, P., Maltby, P. & Brueckner, G.E. 1993, Solar Phys. 145, 257 Maltby, P. 1968 Solar Phys. 4, 96 Maltby, P. 1968a Solar Phys. 5, 3 CDS/SUMER Operations Information about line shapes and wavelength shifts will be derived from the SUMER observations. In order to separate time and spatial variations CDS/NIS is to be operated with a wide slit 90" x 240" and SUMER with a narrow slit 1" x 120" at 3 nearby slit positions. Additional observations with SUMER (CDS) without the support of CDS (SUMER) are of interest to the programme. Parameter List for CDS Study: O_NTHERM --------------------------------------- Study Details Spectrometer: Normal Incidence Slit: 90 x 240 arcseconds Raster Area: 90 x 120 arcseconds Step (DX,DY): 0 arcseconds, 0 arcseconds Raster Locations: 225 x 10 = 2250 Exposure Time: 10 seconds Duration of Raster: 2852 seconds (47.5 minutes) Number of Rasters: 10 Total Duration: ~28520 seconds (~475 minutes) Line Selection: He I 584.33, O V 629.73 Bins Across Line: 60 Telemetry/Compression: truncate to 12 bits Pointing: To pre-planned location Flags: No flag during this study Solar Feature Tracking: On Frequency: Product NIS-movie in two spectral lines Joint Observation SUMER Parameter List for SUMER Study: O_NTHERM 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: OFF Ion(s) in band 1: VIRTUAL .... 990.297 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 17. Your selection requires a telemetry rate of: 9.83040 kbit/s 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^2 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%. 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: 0.124217 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.124217 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 810 on detector A Flat-field correction: OFF Ion(s) in band 1: C III .... 977.020 Angstroem Spectral window(s) (pixel): 50 8. Image format: Format #10 (50*120, B1); 1 time(s) 9. Spectrohelio mode: Spectrohelio 3 Scans back and forth. Integration time: 5.00000 s Step size: 1.14000 arcsec or 3 units. Step number: 3 Step mode: Normal steps Repetition number: 350 Staggering: 1 17. Your selection requires a telemetry rate of: 9.60000 kbit/s Bitrate: 10.0000 kbit/s This item will run for approximately: 119.884 minutes and will cover a solar area defined by 120 px time(s) 3.42000 arcsec^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 121.568 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: 0.00000 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: OFF Ion(s) in band 1: VIRTUAL .... 1045.13 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 17. Your selection requires a telemetry rate of: 9.83040 kbit/s 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^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 123.253 minutes You will use for this item: 0.124217 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.124217 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 810 on detector A Flat-field correction: OFF Ion(s) in band 1: O VI .... 1031.91 Angstroem O VI .... 1037.61 Angstroem Spectral window(s) (pixel): 50 8. Image format: Format #10 (50*120, B1); 2 time(s) 9. Spectrohelio mode: Spectrohelio 3 Scans back and forth. Integration time: 10.0000 s Step size: 1.14000 arcsec or 3 units. Step number: 3 Step mode: Normal steps Repetition number: 175 Staggering: 1 17. Your selection requires a telemetry rate of: 9.60000 kbit/s Bitrate: 10.0000 kbit/s This item will run for approximately: 118.858 minutes and will cover a solar area defined by 120 px time(s) 3.42000 arcsec^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 242.112 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: 0.00000 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM Item # 4 ------------------------------------------------- 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: OFF Ion(s) in band 1: VIRTUAL .... 1240.49 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 17. Your selection requires a telemetry rate of: 9.83040 kbit/s 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^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 243.797 minutes You will use for this item: 0.124217 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.124217 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM Item # 5 ------------------------------------------------- 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 550 on detector A Flat-field correction: OFF Ion(s) in band 1: N V .... 1238.82 Angstroem N V .... 1242.80 Angstroem Spectral window(s) (pixel): 50 8. Image format: Format #10 (50*120, B1); 2 time(s) 9. Spectrohelio mode: Spectrohelio 3 Scans back and forth. Integration time: 10.0000 s Step size: 1.14000 arcsec or 3 units. Step number: 3 Step mode: Normal steps Repetition number: 175 Staggering: 1 17. Your selection requires a telemetry rate of: 9.60000 kbit/s Bitrate: 10.0000 kbit/s This item will run for approximately: 118.858 minutes and will cover a solar area defined by 120 px time(s) 3.42000 arcsec^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 362.655 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: 0.00000 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM Item # 6 ------------------------------------------------- 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: OFF Ion(s) in band 1: VIRTUAL .... 1557.17 Angstroem Spectral window(s) (pixel): 1024 8. Image format: Format #4 (1024*120, B1); 1 time(s) 9. Spectrohelio mode: Spectrohelio 3 Integration time: 200.000 s Step size: 0.00000 arcsec or 0 units. Image number: 1 17. Your selection requires a telemetry rate of: 4.91520 kbit/s Bitrate: 10.0000 kbit/s This item will run for approximately: 3.36813 minutes and will cover a solar area defined by 120 px time(s) 0.00000 arcsec^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 366.023 minutes You will use for this item: 0.124163 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.124163 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM Item # 7 ------------------------------------------------- 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: OFF Ion(s) in band 1: VIRTUAL .... 1557.17 Angstroem Spectral window(s) (pixel): 1024 8. Image format: Format #4 (1024*120, B1); 1 time(s) 9. Spectrohelio mode: Spectrohelio 3 Scans back and forth. Integration time: 100.000 s Step size: 1.14000 arcsec or 3 units. Step number: 3 Step mode: Normal steps Repetition number: 15 Staggering: 1 17. Your selection requires a telemetry rate of: 9.83040 kbit/s Bitrate: 10.0000 kbit/s This item will run for approximately: 101.088 minutes and will cover a solar area defined by 120 px time(s) 3.42000 arcsec^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 467.111 minutes You will use for this item: 0.0715905 MB out of which 0.00000 MB are for uncompressed images. You will have used in total: 0.0715905 MB out of which 0.00000 MB are for uncompressed images. Parameter List for SUMER Study: O_NTHERM Item # 8 ------------------------------------------------- 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 TO PRE-PLANNED LOCATION SOHO roll angle: 0.00000 deg 4. Solar rotation: Standard compensation. 5. Binning (spectral) = 1 (spatial) = 1 6. Compression: 1. Bytescale_min_max (0.69 s). 7. Reference pixel 1: 511 on detector A Flat-field correction: OFF Ion(s) in band 1: VIRTUAL .... 998.750 Angstroem Spectral window(s) (pixel): 1024 8. Image format: Format #4 (1024*120, B1); 1 time(s) 9. Spectrohelio mode: Spectrohelio 3 Integration time: 200.000 s Step size: 0.00000 arcsec or 0 units. Image number: 4 17. Your selection requires a telemetry rate of: 4.91520 kbit/s Bitrate: 10.0000 kbit/s This item will run for approximately: 13.4725 minutes and will cover a solar area defined by 120 px time(s) 0.00000 arcsec^2 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%. More detailed information can be provided by the SUMER Simulator. All items up to now will run for approximately: 480.584 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: 0.00000 MB out of which 0.00000 MB are for uncompressed images.