Conference
Mars Aurora: A Comparison of MAVEN/IUVS and EMM/EMUS Observations
| العنوان: | Mars Aurora: A Comparison of MAVEN/IUVS and EMM/EMUS Observations |
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| المؤلفون: | Schneider, Nicholas, Lillis, Robert, Jain, Sonal, Deighan, Justin, Cessna, Julianna, Chaffin, Michael, Hughes, Andrea, Chirakkil, Krishnaprasad, Gérard, Jean-Claude, Soret, Lauriane |
| المساهمون: | STAR - Space sciences, Technologies and Astrophysics Research - ULiège BE |
| المصدر: | EGU assembly 2024, Vienna, Austria [AT], April 2024 |
| سنة النشر: | 2024 |
| المجموعة: | University of Liège: ORBi (Open Repository and Bibliography) |
| مصطلحات موضوعية: | Mars, aurora, Mars Express, MAVEN, Emirates Mars Mission, electrons, protons, Physical, chemical, mathematical & earth Sciences, Space science, astronomy & astrophysics, Physique, chimie, mathématiques & sciences de la terre, Aérospatiale, astronomie & astrophysique |
| الوصف: | peer reviewed ; Mars' lack of a global magnetic field led to initial expectations of minimal auroral activity. Mars Express's SPICAM instrument nonetheless discovered an unusual form of aurora in 2005. The ultraviolet emissions were confined near Mars' strong crustal field region, showing that even weak magnetic fields can be responsible for aurora. These discrete aurora emissions were identified in 19 observations over SPICAM's decade of observations. The MAVEN spacecraft arrived at Mars in 2014 carrying the Imaging UltraViolet Spectrograph (IUVS). Thanks to its high sensitivity and observing cadence, IUVS increased detections of discrete aurora twenty-fold. IUVS also discovered two new widespread forms of aurora. Diffuse aurora is a planet-engulfing phenomenon, caused by solar energetic protons and electrons directly impacting the entire unshielded planet. Proton aurora is caused by solar wind protons charge-exchanging into the atmosphere and causing Lyman alpha emission across the dayside. IUVS studies the aurora at mid- and far-UV wavelengths in both limb scans and nadir imaging. The Emirates Mars Mission (EMM) arrived in 2021 carrying the Emirates Mission UltraViolet Spectrometer (EMUS). EMUS quickly added to the menagerie of auroral phenomena thanks to its high far-UV sensitivity. Discrete aurora emissions were seen in a substantial fraction of nightside observations, and appear to take on new forms not seen by IUVS (sinuous, "non-crustal field", among others). Furthermore, EMUS detected a spatially-variable form of proton aurora called patchy proton aurora. EMUS studies the aurora through nadir imaging at far- and extreme-UV wavelengths. The net result of the tremendous influx of new observations is a lag in cataloguing and cross-comparing the types of observations made with different instruments at different wavelength ranges in different observing modes. We now have the perspective to identify the causes of these auroral phenomena, which gives a more physics-based nomenclature: suprathermal electron ... |
| نوع الوثيقة: | conference object |
| اللغة: | English |
| Relation: | https://orbi.uliege.be/handle/2268/317900; info:hdl:2268/317900 |
| DOI: | 10.5194/egusphere-egu24-13384 |
| الاتاحة: | https://orbi.uliege.be/handle/2268/317900 https://orbi.uliege.be/bitstream/2268/317900/1/EGU24-13384-print.pdf https://doi.org/10.5194/egusphere-egu24-13384 |
| Rights: | open access ; http://purl.org/coar/access_right/c_abf2 ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.897F8EAF |
| قاعدة البيانات: | BASE |
| DOI: | 10.5194/egusphere-egu24-13384 |
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