LOFAR Data Products. First LOFAR Data Processing School 10 February Michael Wise
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1 LOFAR Data Products First LOFAR Data Processing School 10 February 2009 Michael Wise
2 MAC and Input section Aux. processing section system processing Input section Aux. processing section system processing Most Recent RFI Detection and Flagging Receive External Alert Transient Database De-dispersion Detection Initiate TBB Dump Time and Frequency Averaging Classification Reconfigure Array and Cube Creation and and Input section Aux. processing section system processing Generate External Alert Determine Properties Update Transient Database MAC Science Pipelines Transpose and Apply Coherent De-dispersion Variable RFI Rejection Fold with Pulse Period and Store Frequency/ and Store Single Pulse Data Input section Aux. processing section system processing Most Recent Tied Array Beam Forming Transpose Ephemeris Data Single Pulse Gating and Single Pulse Analysis Input section Aux. processing section system processing Phase Cube and Calculate Dynamic Spectra Integrated Profiles Pulse Parameters Input section Aux. processing section system processing Signal MAC MAC Input section Initiate Dump of Aux. processing section Trigger Messages & Parameters Transpose & Transpose & Input section Ionos. Ionos. Coincidence Aux. processing section Factors for Ionospheric Tied Array Beam Tied Array Beam Receive Trigger Messages & Parameters PPF Inversion PPF Inversion Initiate Dump of Peak Detection Peak Detection Send Trigger Messages & Parameters Peak Detection Receive Alert Message set Creation + Event Parameter List Creation system set Creation & system and processing processing Input section Aux. processing section system processing Flagging & RFI Rejection finding Event Parameter Reconstruction Flagging & RFI Rejection Finding Event Parameter Reconstruction Transport & MAC and Input section Aux. processing section system processing Input section Aux. processing section system processing Input section Initiate Dump of Aux. processing section Trigger Messages & Parameters Coincidence Receive Trigger Messages & Parameters Send Trigger Messages & Parameters and set Creation + Event Parameter List Creation system processing Flagging & RFI Rejection finding Event Parameter Reconstruction Standard Known Pulsars VHECR RM Synthesis Transient Detection EoR UHEP Solar Pulsar Surveys HECR Thunder-Storm Solar Spectral Monitor Derived from combined KSP science ASTRON 2
3 MAC and Input section Aux. processing section system processing Input section Aux. processing section system processing Most Recent RFI Detection and Flagging Receive External Alert Transient Database De-dispersion Detection Initiate TBB Dump Time and Frequency Averaging Classification Reconfigure Array and Cube Creation and and Input section Aux. processing section system processing Generate External Alert Determine Properties Update Transient Database MAC Science Pipelines Transpose and Apply Coherent De-dispersion Variable RFI Rejection Fold with Pulse Period and Store Frequency/ and Store Single Pulse Data Input section Aux. processing section system processing Most Recent Tied Array Beam Forming Transpose Ephemeris Data Single Pulse Gating and Single Pulse Analysis Input section Aux. processing section system processing Phase Cube and Calculate Dynamic Spectra Integrated Profiles Pulse Parameters Input section Aux. processing section system processing Signal MAC MAC Input section Initiate Dump of Aux. processing section Trigger Messages & Parameters Transpose & Transpose & Input section Ionos. Ionos. Coincidence Aux. processing section Factors for Ionospheric Tied Array Beam Tied Array Beam Receive Trigger Messages & Parameters PPF Inversion PPF Inversion Initiate Dump of Peak Detection Peak Detection Send Trigger Messages & Parameters Peak Detection Receive Alert Message set Creation + Event Parameter List Creation system set Creation & system and processing processing Input section Aux. processing section system processing Flagging & RFI Rejection finding Event Parameter Reconstruction Flagging & RFI Rejection Finding Event Parameter Reconstruction Transport & MAC and Input section Aux. processing section system processing Input section Aux. processing section system processing Input section Initiate Dump of Aux. processing section Trigger Messages & Parameters Coincidence Receive Trigger Messages & Parameters Send Trigger Messages & Parameters and set Creation + Event Parameter List Creation system processing Flagging & RFI Rejection finding Event Parameter Reconstruction Available in 2009 Standard Known Pulsars VHECR RM Synthesis Transient Detection EoR UHEP Solar Pulsar Surveys HECR Thunder-Storm Solar Spectral Monitor Derived from combined KSP science ASTRON 2
4 Standard Data Products Standard Visibilities Cubes model parameters Sky models (LSM/GSM) Known Pulsars Beam-formed time series Frequency-phase cubes Dynamic spectra Pulse profiles VHECR TBB time series Dynamic spectra Near-field image cubes For all products: Parsets Processing logs Version info Other metadata... ASTRON 3
5 45 Mhz, 24 hrs Standard Sky Cubes (RA, Dec, freq, pol) Michiel van Haarlem (courtesy S. Yatawatta)
6 RM Synthesis Data Cubes (RA, Dec, RM, pol) (courtesy E. Carretti and G. Bernardi) ASTRON 5
7 Cosmic Ray Cubes Cosmic Ray Air Showers produce radio pulses as liberated electrons spiral in the earth s magnetic field (geosynchrotron emission) Pulse can be imaged as a function position, frequency, and time Near-field imaging (x, y, z, freq, pol, time) ASTRON 6
8 Known Pulsars Beam-formed data product ASTRON 7
9 Pulsar Data B (courtesy J. Hessels) ASTRON 8
10 TBB Time Series ASTRON 9
11 Dynamic Spectra Jupiter bursts (courtesy J.-M. Grießmeier) ASTRON 10
12 Data Descriptions LOFAR Common Headers Minimum observation information (observer, OBSID, erc.) Coordinates, data scales, etc. Definitions for all data products (ICDSs) Headers LOFAR specific (sky, RM, near-field, etc.) FITS versions for 2D (3D?) slices Updated MS Description Extension of MS2.0 for phased-arrays (SKA?) Keyword updates? Flag bit-masks? Etc., etc. Modification Tracking Changes logged to header ASTRON 11
13 Data Descriptions Common header info Beam-formed data header ASTRON 12
14 Visibility Data Data Formats Continue to support CASA MS sets Native support for CASA tables and HDF5 No FITS support (except through translators) MS 3.0 specification under development Cubes Native support for CASA tables and HDF5 Support for both already in casacore, DAL FITS supported provided through translators Time Series BF and TBB time series stored as HDF5 tables Support for PRESTO pulsar formats Support for ROOT, LOPES, etc. ASTRON 13
15 Current ICDs Data Formats ICD I/O Availability Time series HDF5 1.0 R+W Now Beam-formed HDF5 1.0 R+W Now cubes CASA/HDF5 1.0 R+W Now UV data CASA/HDF5 2.0/0.0 R+W/R Q2 09 Supporting several formats CASA measurement sets, tables (CASACORE) FITS images, tables (CFITSIO) HDF5 tables, image cubes (HDF5IO) Raw telemetry formats (TBB, beam-formed, etc..) LOPES, ROOT, PRESTO, etc... ASTRON 14
16 Sky Model Database GSM stored as a database (MySQL, PostgreSQL, MonetDB) Many predictive functions implemented in database Python interfaces provided for database access Simulated maps created using external tools (SKP, N. Mohan) ASTRON 15
17 LOFAR Archive Collaboration with ASTRO-WISE ASTRON 16
18 LOFAR Archive Collaboration with ASTRO-WISE ASTRON (courtesy W.-J. Friend and J. McFarland) 16
19 LOFAR Archive Collaboration with ASTRO-WISE ASTRON (courtesy W.-J. Friend and J. McFarland) 17
20 LOFAR Archive Collaboration with ASTRO-WISE ASTRON (courtesy W.-J. Friend and J. McFarland) 17
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