The purpose of this study is to investigate velocity space distribution functions in space plasmas. Orbit tracing methods are used to generate self-consistent models of several different magnetic and electric field configurations. Fast flows in the magnetotail are selected to be modeled using a relatively thin current sheet compared with quiet times. Four different electric fields are imposed, varying in characteristic thickness and magnitude. Using these four particle based models we were able to generate velocity distribution functions that show clear evidence of non-adiabatic features that depend on the electric field characteristic width. Several years of Geotail Comprehensive Plasma Instrumentation (CPI) data were subsequently examined to find data sets for comparison. Four events out of more than twenty are chosen for closer comparison. It is shown that the modeled distributions are very similar to the spacecraft data. Non-adiabatic orbits can be interpreted as the cause of these features, and an understanding of how they interact with the local electric fields is reached.
","abstract_html":"<p>The purpose of this study is to investigate velocity space distribution functions in space plasmas. Orbit tracing methods are used to generate self-consistent models of several different magnetic and electric field configurations. Fast flows in the magnetotail are selected to be modeled using a relatively thin current sheet compared with quiet times. Four different electric fields are imposed, varying in characteristic thickness and magnitude. Using these four particle based models we were able to generate velocity distribution functions that show clear evidence of non-adiabatic features that depend on the electric field characteristic width. Several years of Geotail Comprehensive Plasma Instrumentation (CPI) data were subsequently examined to find data sets for comparison. Four events out of more than twenty are chosen for closer comparison. It is shown that the modeled distributions are very similar to the spacecraft data. Non-adiabatic orbits can be interpreted as the cause of these features, and an understanding of how they interact with the local electric fields is reached.</p>","abstract_has_math":false,"creators":["Boll, Bryan Michael"],"institution":null,"degree_name":"Doctor of Philosophy","degree_level":"Dissertation","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Richard L Kaufmann"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2001,"date_issued":"2001-01-01T08:00:00Z","date_published":"2001-01-01T08:00:00Z","updated_at":"2026-07-24T05:21:54Z","subjects":["Physics","Astronomy and Astrophysics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholars.unh.edu/dissertation/33","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Richard L Kaufmann"]},{"key":"dc:creator","label":"Author","values":["Boll, Bryan Michael"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics","Astronomy and Astrophysics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholars.unh.edu/dissertation/33"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The purpose of this study is to investigate velocity space distribution functions in space plasmas. Orbit tracing methods are used to generate self-consistent models of several different magnetic and electric field configurations. Fast flows in the magnetotail are selected to be modeled using a relatively thin current sheet compared with quiet times. Four different electric fields are imposed, varying in characteristic thickness and magnitude. Using these four particle based models we were able to generate velocity distribution functions that show clear evidence of non-adiabatic features that depend on the electric field characteristic width. Several years of Geotail Comprehensive Plasma Instrumentation (CPI) data were subsequently examined to find data sets for comparison. Four events out of more than twenty are chosen for closer comparison. It is shown that the modeled distributions are very similar to the spacecraft data. Non-adiabatic orbits can be interpreted as the cause of these features, and an understanding of how they interact with the local electric fields is reached.
"]},{"key":"dc:title","label":"Title","values":["Non-adiabatic features in magnetotail fast flows: Orbit tracing and data comparisons"]}]}],"canonical_facts":{"dc:contributor":["Richard L Kaufmann"],"dc:creator":["Boll, Bryan Michael"],"dc:description.abstract":["The purpose of this study is to investigate velocity space distribution functions in space plasmas. Orbit tracing methods are used to generate self-consistent models of several different magnetic and electric field configurations. Fast flows in the magnetotail are selected to be modeled using a relatively thin current sheet compared with quiet times. Four different electric fields are imposed, varying in characteristic thickness and magnitude. Using these four particle based models we were able to generate velocity distribution functions that show clear evidence of non-adiabatic features that depend on the electric field characteristic width. Several years of Geotail Comprehensive Plasma Instrumentation (CPI) data were subsequently examined to find data sets for comparison. Four events out of more than twenty are chosen for closer comparison. It is shown that the modeled distributions are very similar to the spacecraft data. Non-adiabatic orbits can be interpreted as the cause of these features, and an understanding of how they interact with the local electric fields is reached.
"],"dc:identifier":["https://scholars.unh.edu/dissertation/33"],"dc:subject":["Physics","Astronomy and Astrophysics"],"dc:title":["Non-adiabatic features in magnetotail fast flows: Orbit tracing and data comparisons"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy"]},"updated_at":"2026-07-24T05:21:54Z"}