| Affiliation: | (1) Naval Research Laboratory, Code 7660, 4555 Overlook Avenue SW, Washington, DC 20375, U.S.A.;(2) Interferometrics, 14120 Parke Long Court, Suite 103, Chantilly, VA, 20151, U.S.A.;(3) Universities Space Research Association, 1101 17th Street NW, Suite 1004, Washington, DC, 20036, U.S.A.;(4) Laboratoire d'Astronomie Spatiale, F13376 Marseille, Cedex 12, France;(5) NOAA, Space Environment Center, 325 Broadway, Boulder, CO, 80305, U.S.A.;(6) The Catholic University of America, 620 Michigan Avenue NE, Washington, DC, 20064, U.S.A.;(7) Swales Aerospace, 5050 Powder MIll Rd, Beltsville, MD, 20705, U.S.A;(8) SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, U.S.A. |
| Abstract: | We present a detailed review of the calibration of the LASCO C3 coronagraph on the SOHO satellite. Most of the calibration has been in place since early in the mission and has been utilized to varying degrees as required by specific analysis efforts. However, using observational data from the nearly decade-long database of LASCO images, we have re-evaluated and improved many aspects of the calibration. This includes the photometric calibration, vignetting function, geometric distortion, stray light, and exposure and observation times. Using this comprehensive set of corrections we have generated and made available a set of calibrated coronal images along with a set of periodic background images to ease the accessibility and use of the LASCO database. Deceased |
