{"692809":{"#nid":"692809","#data":{"type":"event","title":"PhD Defense by Charles Michael Haynes","body":[{"value":"\u003Cp\u003ECharles Michael Haynes\u003Cbr\u003E(Advisor: Prof. Simon) \u0026nbsp;\u003Cbr\u003Ewill defend a doctoral thesis entitled,\u003Cbr\u003EEmission of Energetic Neutral Atoms from Magnetosphere-Atmosphere Interactions at Jupiter\u0027s Icy Galilean Satellites\u003Cbr\u003EOn\u003Cbr\u003EFriday, November 06 at 3:00 p.m.\u0026nbsp;\u003Cbr\u003EFord ES\u0026amp;T Room L1205\u003Cbr\u003E311 Ferst Dr NW, Atlanta, GA 30332\u003Cbr\u003EAbstract\u003Cbr\u003EJupiter\u0027s icy Galilean satellites--Europa, Ganymede, and Callisto--represent critical targets for space exploration. These moons are constantly exposed to the (sub)corotating plasma occupying the Jovian magnetosphere as it overtakes their orbital motion. Jupiter\u0027s dipolar and spin axes are offset by 9.6\u00ba so the ambient plasma properties and magnetic fields at the moons oscillate with the Jovian synodic period (\u224811 hr). The time-variable magnetic field drives an observable inductive response in the putative saline subsurface ocean inside each moon. Ganymede also boasts a permanent, dynamo-driven dipole field that locally dominates Jupiter\u0027s field, constructing a mini-magnetosphere. These objects\u0027 tenuous atmospheres and internal fields interact with Jupiter\u0027s magnetosphere, generating perturbations in the electromagnetic fields and plasma flow. Atmospheric inhomogeneities and induction signatures affect the morphology of these perturbations, providing a glimpse into moon properties. However, three-dimensional characterization of the moon-plasma interaction regions requires information assembled from many spacecraft flybys under similar ambient conditions. Fortunately, there exists another avenue to characterize plasma interactions using the energetic ion population of Jupiter\u0027s magnetosphere. Charge exchange between such ions and atmospheric neutrals generates energetic neutral atoms (ENAs), which travel away along straight lines due to their high inertia. The Jupiter Icy Moons Explorer (JUICE) mission will arrive at Jupiter in 2031 and capture ENA images of the icy Galilean satellites using a detector analogous to a camera for ENAs. Since the energetic ions are guided into the moons\u0027 atmospheres by the locally deformed electromagnetic fields, ENA emissions are encoded with information on the structure of the fields as well as the atmospheres and ambient energetic ion populations. Hence, ENA images are two-dimensional \u201csnapshots\u201d of a moon\u0027s interaction region that complement magnetometer and plasma data collected in situ. However, this information is intertwined within the images in a complex way. Therefore, we develop a theoretical framework to facilitate the planning and analysis of upcoming ENA observations by JUICE. We present a suite of models that determines the ENA emissions for a given set of ambient magnetospheric parameters and configurations of each moon\u0027s atmosphere. First, we calculate global maps of the ENA flux through a sphere encapsulating the atmosphere. Next, we emulate the detector aboard JUICE to produce synthetic ENA images for a variety of vantages. We demonstrate that ENA emissions at Europa and Callisto are observable in a band oriented perpendicular to the ambient field direction, while the closed dipolar field lines at Ganymede reduce the ENA emissions emanating from this moon\u0027s equatorial regions. Analysis of hundreds of synthetic ENA images indicates that, for certain detector vantages, each moon\u0027s plasma interaction leaves unique signatures in the emissions. \u0026nbsp;\u0026nbsp;\u003Cbr\u003ECommittee\u003Cbr\u003E\u2022\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Prof. \u0026nbsp;Sven Simon \u2013 School of Earth and Atmospheric Sciences and School of Physics (advisor) \u0026nbsp;\u003Cbr\u003E\u2022\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Dr. Lucas Liuzzo \u2013 Space Sciences Laboratory, University of California, Berkeley\u003Cbr\u003E\u2022\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Prof. Samer Naif \u2013 School of Earth and Atmospheric Sciences \u0026nbsp;\u003Cbr\u003E\u2022\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Prof. A. Nepomuk Otte \u2013 School of Physics\u003Cbr\u003E\u2022\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Prof. James Wray \u2013 School of Earth and Atmospheric Sciences\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EEmission of Energetic Neutral Atoms from Magnetosphere-Atmosphere Interactions at Jupiter\u0027s Icy Galilean Satellites\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Emission of Energetic Neutral Atoms from Magnetosphere-Atmosphere Interactions at Jupiter\u0027s Icy Galilean Satellites"}],"uid":"27707","created_gmt":"2026-09-24 16:27:12","changed_gmt":"2026-09-24 22:08:15","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2026-11-06T15:00:00-05:00","event_time_end":"2026-11-06T17:00:00-05:00","event_time_end_last":"2026-11-06T17:00:00-05:00","gmt_time_start":"2026-11-06 20:00:00","gmt_time_end":"2026-11-06 22:00:00","gmt_time_end_last":"2026-11-06 22:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Ford ES\u0026T Room L1205","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}