1. Goddard Planetary Heliophysics Institute; University of Maryland; Baltimore Maryland USA
2. NASA; Goddard Space Flight Center; Greenbelt Maryland USA
3. Solar Section; Applied Physics Laboratory Johns Hopkins University; Laurel Maryland USA
4. Department of Astronomy; University of Maryland; College Park Maryland USA
5. Institute for Astrophysics and Computational Sciences; Catholic University of America; Washington District of Columbia USA
6. Institute for Astrophysics; Georg-August-University of Göttingen; Göttingen Germany