1. LESIA, Paris Observatory, PSL University, CNRS, Sorbonne University, Université de Paris , 5 place Jules Janssen, F-92195 Meudon, France
2. Central School of Nantes , 1 rue de la Noë, F-44300 Nantes, France
3. Technical University of Denmark , Anker Engelunds Vej 1 Bygning 101A, 2800 Kgs. Lyngby, Denmark
4. University of Western Ontario, Department of Physics & Astronomy , London, Ontario N6A 3K7, Canada
5. Armagh Observatory and Planetarium , College Hill, Armagh BT61 9DG, Northern Ireland, UK
6. University of Tartu, Faculty of Science and Technology , Tartu Observatory, 50090 Tartu, Estonia
7. Dept. of Physics & Space Science, Royal Military College of Canada , PO Box 17000 Station Forces, Kingston, ON K7K 0C6, Canada