1. 4th Solar KSP Meeting Potsdam 2010 November 08
Solar Imaging with the
Standard Imaging Pipeling
Frank Breitling
Astrophysikalisches Institut Potsdam

2. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
Overview
Introduction to the pipeline
Status of solar imaging
New results
Conclusions
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

3. The LOFAR Standard Imaging Pipeline
Components
OLAP: Online Application Processing (Blue Gene/P correlator)
DP3/DPPP: Default Pre-Processing Pipeline (for flagging and averaging)
BBS: BlackBoard Selfcal (calibration)
CImager: Imagers
Control
via parset files
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

4. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
Details
Data format
Measurements Sets (MS) from CASA
Batch processing
DPPP
BBS
Imagers
(LOFAR wiki:
(Cookbook:
Interactive Processing
CASA (Common Astronomy Software Applications ( CASA Cookbook)
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

5. First solar observations
Date: :17:00, 11:41:00, 13:40:00, 15:40:00 Duration: 4 x 10 Min Frequency range: ~ MHz LOFAR stations: 20 core (CS) + 3 remote (RS) stations, i.e.: RS106HBA, RS306HBA, RS503HBA, (CS001-7, CS021, CS030, CS103)xHBA0+1 Total data volume: 1.5 TB
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

6. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

7. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
LOFAR: 135 MHz
Nancy RH: MHz
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

8. Details about data - SB105 (msinfo)
# of visibilities: Phase center: +05:05:09.0, +24:09:52.0 Frequency range (MHz): Wavelength range (m): Observation time span: T10:17: :27:00 Duration (min): 10 time bin / integration: # of channels: 256 channel width (KHz): 0.8 # of polarizations: 4 # of antennas: 25
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

9. Problems during data analysis
Imperfect calibration
Clock offsets =>
Clock offsets (from Olaf) Station microsec CS001HBA0 0 CS001HBA CS002HBA CS002HBA CS003HBA CS003HBA1 1.9 CS004HBA CS004HBA1 1.9 CS005HBA CS005HBA1 1.9 CS007HBA CS007HBA1 1.9 CS006HBA CS006HBA CS021HBA CS021HBA CS030HBA CS030HBA CS032HBA CS032HBA CS103HBA CS103HBA RS106HBA RS306HBA 0 RS503HBA 0.007
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

10. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
BBS Sky Model
# (Name, Type, Ra, Dec, I, Q, U, V, ReferenceFrequency='60e6', SpectralIndexDegree='0', SpectralIndex:0='0.0', MajorAxis, MinorAxis, Orientation) = format
# The above line defines the field order and is required.
Sun, GAUSSIAN, 14:18:17.00, , , 0.0, 0.0, 0.0,81.5e6, 0, 0., , , 0.0
TauA.neb, GAUSSIAN, 05:34:32.00, , , 0.0, 0.0, 0.0,81.5e6, 0, , 420.0, 290.0, 0.0
3C123, POINT, 04:37:04.72, ,
3C133, POINT, 05:02:58.58, ,
Now reduced to only 4 sources
Sun is strongly dominating
3C sources from “The VLA Low-Frequency Sky Survey” catalog (
Sun coordinates from (
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

11. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
Model Images with BBS
blmax: 60m 125m 250m
500m 1000m all
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

12. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
UV Coverage
60m 125m 250m
500m 1000m all
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

13. Core stations without clock offsets
Use only core stations CS002-CS007 (Baselines <400m)
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

14. SB184: 150.885-151.068 MHz Nancy Radio Heliograph frequency 150.9 MHz
Dirty image
Model image
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

15. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
SB184: MHz T15:40: :50:00
Dirty image
Model image
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

16. Data volume problem Data is difficult to Data analysis
find on offline cluster
copy and archive
Data analysis
consumes a lot of CPU
takes very long
Obtain
Use
Subbands
~200 ~5
Channels
256 32
Total data volume
1.5 TB
1.5 GB
We have to emphasize more that
we want small data samples!!!
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

17. Conclusion / Outlook
First solar images with the Standard Imaging Pipeline
Quality needs improvement
Analysis needs to be extended to more subbands
7 new solar observation were taken on ,30
Should only request 10 subbands for next observations
Olaf will spend the next days at the AIP for data analysis
Many problems have been and will be discussed at the LOFAR Forum
Thanks for your attention
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

18. Solar Imaging with the Standard Imaging Pipeline, Frank Breitling
References
User Software Group:
LOFAR User Forum:
LOFAR Interface Control Documents (ICDs)
Documentation for the Standard Imaging Pipeline
The LOFAR Imaging Cookbook
Frank Breitling <fbreitling at aip.de>
2010 Nov 8, Potsdam 4th Solar KSP Workshop
Solar Imaging with the Standard Imaging Pipeline, Frank Breitling