4th Solar KSP MeetingPotsdam

2010 November 08

Solar Imaging with the

Standard Imaging Pipeling

Frank Breitling

Astrophysikalisches Institut Potsdam

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

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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

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Details

• Data format– Measurements Sets (MS) from CASA

• Batch processing– DPPP– BBS– Imagers(LOFAR wiki: http://www.lofar.org/wiki/doku.php?id=software:standard_imaging_pipeline)

(Cookbook: http://www.mpa-garching.mpg.de/~fdg/LOFAR_cookbook/LOFAR_Cookbook_v2.3.pdf)

• Interactive Processing– CASA (Common Astronomy Software Applications (

http://casa.nrao.edu/ CASA Cookbook)

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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First solar observations

Date: 2010-06-09 10:17:00, 11:41:00, 13:40:00, 15:40:00

Duration: 4 x 10 Min

Frequency range:~120-180 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

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2010 Nov 8, Potsdam 4th Solar KSP Workshop

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2010 Nov 8, Potsdam 4th Solar KSP Workshop

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LOFAR: 135 MHz Nancy RH: 150.9 MHz

Details about data - SB105(msinfo)

# of visibilities: 194025

Phase center: +05:05:09.0, +24:09:52.0

Frequency range (MHz): 135.449 -- 135.645

Wavelength range (m): 2.213 -- 2.210

Observation time span: 2010-06-09T10:17:00 -- 10:27:00

Duration (min): 10

time bin / integration: 1.00663

# 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

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Problems during data analysis

• Imperfect calibration• Clock offsets =>

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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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, -13.49.12.0, 60000.00, 0.0, 0.0, 0.0,81.5e6, 0, 0., 4000.0, 4000.0, 0.0

TauA.neb, GAUSSIAN, 05:34:32.00, +22.00.52.00, 1888.55, 0.0, 0.0, 0.0,81.5e6, 0, -0.299, 420.0, 290.0, 0.0

3C123, POINT, 04:37:04.72, +29.40.15.6, 454.97

3C133, POINT, 05:02:58.58, +25.16.22.7, 44.67

• Now reduced to only 4 sources• Sun is strongly dominating

• 3C sources from “The VLA Low-Frequency Sky Survey” catalog (http://www.cv.nrao.edu/4mass/VLSSlist.shtml)

• Sun coordinates from (http://www.jgiesen.de/astro/astroJS/sunriseJS/index.htm)

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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Model Images with BBS

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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blmax: 60m 125m 250m

500m 1000m all

UV Coverage

2010 Nov 8, Potsdam 4th Solar KSP Workshop

Solar Imaging with the Standard Imaging Pipeline, Frank Breitling

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60m 125m 250m

500m 1000m all

Core stations without clock offsets

Use only core stations CS002-CS007 (Baselines <400m)

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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SB184: 150.885-151.068 MHzNancy Radio Heliograph frequency 150.9 MHz

• Dirty image • Model image

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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SB184: 150.885-151.068 MHz2010-06-09T15:40:00 - 15:50:00

• Dirty image • Model image

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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Data volume problem

Data is difficult to– find on offline cluster– copy and archive

Data analysis– consumes a lot of CPU– takes very long

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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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!!!

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 2010-10-29,30• 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

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References

• User Software Group: http://usg.lofar.org/• LOFAR User Forum: http://usg.lofar.org/forum/index.php• LOFAR Interface Control Documents (ICDs)

http://usg.lofar.org/wiki/doku.php?id=documents:lofar_data_products• Documentation for the Standard Imaging Pipeline

http://www.lofar.org/wiki/doku.php?id=software:standard_imaging_pipeline• The LOFAR Imaging Cookbook

http://www.mpa-garching.mpg.de/~fdg/LOFAR_cookbook/LOFAR_Cookbook_v2.3.pdf

• Frank Breitling <fbreitling at aip.de> http://www.aip.de/People/fbreitling/

2010 Nov 8, Potsdam 4th Solar KSP Workshop

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