1. Department of Surface and Plasma Science Charles University Prague Czech Republic
2. Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA
3. Department of Smead Aerospace Engineering Sciences University of Colorado Boulder CO USA
4. Department of Physics University of Colorado Boulder CO USA
5. Department of Physics and Astronomy University of Iowa Iowa City IA USA
6. Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen Guangdong China