SH036-0024
First results from the EUI and SPICE observations of Alpha Leo near Solar Orbiter first perihelion
Monday, 14 December 2020
Poster
Eric Buchlin1, Luca Teriaca2, Alessandra S Giunta3, Tim Grundy3, Vincenzo Andretta4, F Auchere1, Hardi Peter5, David Berghmans6, Mats Carlsson7, Andrzej Fludra3, Louise Harra8, Don Hassler9, David Long10, Pierre Leon Rochus11, Udo Schühle2, Regina Aznar Cuadrado2, Martin Caldwell3, Stéphane Caminade1, Craig DeForest9, Terje Fredvik7, Samuel Gissot6, Klaus Heerlein2, Miho Janvier1, Emil Kraaikamp6, Therese Ann Kucera12, Daniel Müller13, Susanna Parenti14,15, Werner K Schmutz16, Sunil Sidher3, Philip Smith17, Koen Stegen6, William T Thompson18, Cis Verbeeck6, David Williams19 and Peter R Young12, (1)Université Paris-Saclay, CNRS, Institut d'Astrophysique Spatiale, Orsay, France, (2)Max Planck Institute for Solar System Research, Göttingen, Germany, (3)RAL Space, STFC Rutherford Appleton Laboratory, Didcot, United Kingdom, (4)INAF - Osservatorio Astronomico di Capodimonte, Napoli, Italy, (5)Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany, (6)Royal Observatory of Belgium, Brussels, Belgium, (7)University of Oslo, Institute of Theoretical Astrophysics, Oslo, Norway, (8)PMOD/WRC and ETH-Zürich, Davos, Switzerland, (9)Southwest Research Institute, Boulder, CO, United States, (10)University College London, London, United Kingdom, (11)Centre Spatial de Liege, Liege, Belgium, (12)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (13)European Space Agency, ESTEC, Noordwijk, Netherlands, (14)Université Paris-Saclay, CNRS, Institut d'Astrophysique Spatiale, Orsay Cedex, France, (15)CEA Commissariat à l'Energie Atomique Saclay, Gif-Sur-Yvette Cedex, France, (16)Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, Davos Dorf, Switzerland, (17)UCL - Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, United Kingdom, (18)ADNET Systems Inc., NASA Goddard Space Flight Center, Greenbelt, MD, United States, (19)European Space Agency, ESAC, Villanueva De La Cañada, Madrid, Spain
Abstract:
On June 16th 2020 Solar Orbiter made a dedicated observing campaign where the spacecraft pointed to the solar limb to allow some of the high resolution instruments to observe the ingress (at the east limb) and later the egress (west limb) of the occultation of the star Alpha Leonis by the solar disk. The star was chosen because its luminosity and early spectral type ensure high and stable flux at wavelengths between 100 and 122 nanometers, a range observed by the High Resolution EUI Lyman alpha telescope (HRI-LYA) and by the long wavelength channel of the SPICE spectrograph. Star observations, when feasible, allow to gather a great deal of information on the instrument performances, such as the radiometric performance and the instrument optical point spread function (PSF).
We report here the first results from the above campaign for the two instruments.
