2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/SOHO/LASCO/C2/Level_10/PT12M NASA NumericalData SOHO LASCO C2 Level 1.0 FITS Data https://doi.org/10.48322/h5kj-3939 2025-12-04T13:31:29Z 2024-08-10T00:08:46 Metadata created by SY 2024-09-05T00:08:46 Added DOI by SY 2025-06-11T14:59:13 Added HelioViewerID to Extension 2025-07-25T00:08:46 Updated HelioViewerID 2025-09-18T11:27:09Z Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB 2025-10-03T11:24:32Z Updated PublishedBy name to match ROR Registry. ZCB 2025-12-04T13:31:29Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB The LASCO C2 Calibrated FITS Data. LASCO (Large Angle Spectroscopic Coronagraph) is comprised of three nested coronagraphs (C1, C2, and C3) that image the solar corona from 1.1--30 solar radii (C1: 1.1--3; C2: 1.5--6; and C3: 3--30). The inner coronagraph (C1) is a newly developed mirror version of the classic Lyot coronagraph without an external occulter, while the middle coronagraph (C2) and the outer one (C3) are externally occulted. C1 is equipped with a Fabry-Perot interferometer that can take monochromatic images over the whole field of view with a spectral resolution of 0.07 nm. By stepping the bandpass across a spectral line, line profiles and Doppler shifts can be derived from all 1024 x 1024 pixels simultaneously. With an equivalent pixel size of 5.6 arcsec, the spatial resolution of C1 is ~11 arcsec. The resolution is ~23 arcsec for C2, and 112 arcsec for C3. The calculated expected precision of the emission line measurements, for example, of the 637.4 nm Fe X line is 0.05 Km/s at 1.1 solar radii, 1.0 km/s at 2 solar radii, and 8.0 km/s at 3 solar radii, all for a 60 s exposure. All three devices use a 1024 x 1024 pixel CCD. The CCDs are passively cooled to 193 K, but can be heated above ambient temperatures to drive off condensed material. The readout rate is ~21 s for a full image, but any line on the CCD can be accessed within about 60 ms, the unwanted lines being dumped. The electronics box provides overall control, including observation programs and scheduling. An observation program can be scheduled to be run at an absolute time or just next in sequence. It can run for a certain number of iterations, an interval of time, or stop at an absolute time. The observation program tasks included, e.g., taking single images from one of the telescopes, a series of images through the three linear polarizers, and a sequence of images at a series of Fabry-Perot wavelength steps. The image processing tasks are primarily image compression, with seven different techniques being available. On average, the readout time should be ~6 minutes or about 200 images/day. This information is from the paper ``The Large Angle Spectroscopic Coronagraph (LASCO): Visible Light Coronal Imaging and Spectroscopy,'' by G. E. Brueckner et al. (Proceedings of the First SOHO Workshop, ESA SP-348, pp. 27-34, November 1992). The LASCO Consortium: Naval Research Laboratory (USA); University of Birmingham (UK); Max-Planck-Institut für Aeronomie (Germany); Laboratoire d'Astronomie Spatiale (France) 1996-01-16T00:00:00 Solar Data Analysis Center; European Space Astronomy Centre spase://SMWG/Person/Karl.Battams PrincipalInvestigator spase://SMWG/Person/Guenter.E.Brueckner FormerPI spase://SMWG/Person/Russell.A.Howard FormerPI spase://SMWG/Person/Jack.Ireland HostContact spase://SMWG/Person/Seiji.Yashiro MetadataContact The Large Angle Spectroscopic Coronagraph (LASCO) https://doi.org/10.1007/BF00733434 The LASCO Instrument paper https://lasco-www.nrl.navy.mil/ The LASCO website spase://VSPO/NumericalData/P_SOHO_HDR_LASCO_INTENS spase://VSPO/NumericalData/SOHO/LASCO/PT5M spase://NASA/NumericalData/SOHO/LASCO/PT5M spase://NASA/NumericalData/SOHO/LASCO/VSO_SDAC spase://SMWG/Repository/SDAC Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products Virtual Solar Observatory https://sdac.virtualsolar.org/cgi/search?time=1&inst_only=1&version=current&build=1&instrument=LASCO FITS spase://ESA/Repository/SOHOScienceArchive Online Open SOHO Science Archive https://ssa.esac.esa.int/ssa/#/pages/search FITS Calibrated Level 1.0 spase://SMWG/Instrument/SOHO/LASCO ImageIntensity 1995-12-08T00:00:00 -P2M Data are current to within about two months. PT12M Sun Sun.Corona Brightness Mean Solar Brightness (MSB) Photon Intensity 4