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Improvement of the photometric sunspot index and changes of thedisk-integrated sunspot contrast with time |
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| Authors: | Claus Fröhlich Judit M Pap Hugh S Hudson |
| Institution: | (1) Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center Davos Dorf, Switzerland;(2) Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA;(3) Institute for Astronomy, University of Hawaii Honolulu, Hawaii, USA |
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