This Master of Science Thesis has been conducted at
The Department of Astronomy and Space Physics at Uppsala University.

First and foremost I would like to thank my instructors, Andris Vaivads and Annika Olsson,
for their invaluable support. I would like to thank Mats André for arranging this thesis project.
In addition I want to thank Anders Eriksson, Pekka Janhunen, Forrest Mozer,
and Per-Arne Lindqvist for inputs.