################################################################################ This Readme file contains a description of the Quiet Sun (Single-pointing) Band3 Solar Science Verification data and data products. Additional information can be found at: http://almascience.org/alma-data/science-verification The calibration and imaging procedure are described below. A tutorial on reducing solar data can be found in a CASA guide at: https://casaguides.nrao.edu/ The Calibrated Data and Reference Images provided here were produced using CASA version 4.7.0. ################################################################################ These SV observations have been taken with the aim of testing ALMA solar capability at Band3 (100 GHz, 3.00mm). The observations were obtained between 18:44:38 -- 19:33:19 UT on 11 December 2014 in the 5th solar commissioning campaign. The target of the observations is the quiet sun. On an EUV image of the same FoV, an XBP is located near the center of the FoV. The LO1 frequency was set to 100 GHz and the correlator mode set to Time Domain Mode (TDM). The spectral windows for solar observations differ significantly from non-solar observation in that scientific data are contained in spectral window ID numbers 1, 3, 5, and 7. The calibrated data contained in 2014_QS_Band3_CalibratedData.tgz includes only the data for these spectral windows. WVR calibration must not be applied for this dataset because the radiometers saturate when the ALMA antennas point toward the Sun. [[[ Caution ]]]----------------------------------------------------------------- During the observation, the measurement of T_ant was not carried out. At the calibration process, we assume that the T_ant of the Sun is 7000K @ Band3 and there is no dependence on antennas. The phase calibrator was used as the bandpass calibrator. No flux calibrator was observed. From these reasons, the relative brightness in the synthesized images has a large uncertainty. -------------------------------------------------------------------------------- 2014_QS_Band3_UncalibratedData.tgz contains the raw data and the complete set of scripts to calibrate the data and produce images. The tar file contains: 1 asdm datasets: * uid___A002_X968840_X2aa % There is no data of TP-array. 2 python scripts: * QuietSunBand3Cal.py * QuietSunBand3Img.py [Instructions to run the calibration and imaging scripts] Before running the python scripts, the following software must be installed: - CASA https://casa.nrao.edu/ - Analysis Utilities https://casaguides.nrao.edu/index.php/Analysis_Utilities Instructions to install these packages can be found at the above websites. After unzip+tar, move the working directory to 2014_QS_Band3_UncalibratedData. Then, start CASA and execute the following commands: execfile('QuietSunBand3Cal.py') execfile('QuietSunBand3Img.py') The scripts will create the calibrated uv data and the synthesized image. When the data processing completes successfully, the FITS file will have been created in the working directory. The FITS files are also included in the download package in the tar file 2014_QS_Band3_Referenceimages.tgz. --------------------------------------------- 2014_QS_Band3_CalibratedData.tgz contains the calibrated uv data and scripts that can be used to create the synthesized image. The tar file contains: * uid___A002_X968840_X2aa_split_cal.ms * QuietSunBand3Img.py [Instructions to run the imaging scripts] Before starting the reduction and imaging processes, you must install the following software. - CASA https://casa.nrao.edu/ After unzip+tar, move the working directory 2014_QS_Band3_CalibratedData. Then, start CASA and execute the following command: execfile('QuietSunBand3Img.py') When the imaging scripts complete successfully, the FITS file will be present in the working directory. The FITS files are also included in the download package in the tar file 2014_QS_Band3_Referenceimages.tgz. ----------------------------------------------- 2014_QS_Band3_Referenceimages.tgz contains the final image products: * QuietSun_Band3_allspw_I.fits --------------------------------------------------------------- Publications making use of these data must include the following statement in the acknowledgement: "This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00020.SV. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ." In addition, publications from NA authors must include the standard NRAO acknowledgement: "The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc." --------------------------------------------------------------- ---------------------------------------------------------------