Combined ground and in-situ measurements needed in solar-terrestrial research

• Main Author: Alv Egeland
• Format: Report
• Language: English
• Published: Department of Physics, University of Oslo 1998
• Subjects: Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2309; http://id.nii.ac.jp/1291/00002309/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2309&item_no=1&attribute_id=18&file_no=1

Although much progress has recently been made in our understanding of the terrestrial space environment, many questions remain. Our efforts have uncovered new questions that need to be addressed. In this paper I will mainly discuss why ground-based observations are needed in addition to in-situ measurements in the study of dayside magnetosphere-ionosphere coupling processes and boundary layer phenomena. The mapping of boundary layers based on optical measurements will be compared by the statistical data of particle precipitation regions developed from satellite observations. Satellites can never acquire data which are not ambiguous in time and space. The resolution in space and time for important plasma processes are often not adequate. Thus, without coordinated ground-based observations in-situ measurements will be severely limited. The future emphasis should be on the dynamic nature of magnetospheric processes and their ionospheric signatures. Three-dimensional maps of the space environment are needed. Because of the global extent of these phenomena, international cooperation's will be more and more important in years to come.