io workshop 2013 - lpi.usra.edu · io workshop 2013 • coordination for the exceed (sprint-a)...
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Io workshop 2013
• Coordination for the EXCEED (SPRINT-A) mission
Presentations • Observations of volcanoes
– dePater (Berkeley) – deKleer (Berkeley) – Rathbun (PSI)
• Volcano modeling – Howell (Wyoming) – Davies (JPL)
• Observations of atmosphere – Hendrix (PSI) – McGrath (MSFC) – Tsang (SWRI) – Spencer (SWRI)
• Atmosphere Modeling – Goldstein (Austin)
• Torus/Plasma – Crary (LASP) – Schmidt (virginia) – Kraft (SAO) – Morgenthaler (PSI) – Schneider (LASP)
• Other participants – Aiello, Bagenal, Burger,
Degenhardt, Dols, Green, Hoey, Lopes, McDoniel, Moullet, Rugenski, Skrutskie, Steffl, Trafton, Verbiscer
http://www.boulder.swri.edu/~con/ioworkshop2013/Home.html
Hisaki – SPRINT-A - EXCEED
• Launched September 14, 2013 • Extreme-ultraviolet (EUV) imaging spectrometer • observe the Jupiter
system for ~50 min on every ~100 min orbit, for several months
• Will also monitor the Io Plasma Torus & aurora
http://www.jaxa.jp/projects/sat/sprint_a/index_e.html
Model Spectrum
• Yoshioka et al., 2012
• Based on: – e- density – Core e- temp – Hot e- T – Hot e- frac
Support Observations • Jupiter Aurora
– Haleakala (Satoh) – HST/STIS (Badman) – HST/STIS (Gerard) – NOAO Gemini (Melin) – IRTF CSHELL (Stallard) – Chandra & XMM (Kraft) – Subaru (Tao)
• Io Torus/Neutrals – McDonald (Mendillo) – McMath-Pierce (Morgenthaler) – Apache Point (Schneider) – Haleakala (Kagitani) – NOAO Kitt Peak (Badman) – Suzaku (Ezoe)
• Jupiter – SOFIA (de Pater) – HST/WFPC (de Pater) – EVLA (de Pater)
• Io volcanoes – Keck (dePater) – IRTF NSFCAM2 (Rathbun) – IRTF SPEX (de Kleer) – Gemini (de Kleer) – ALMA (de Pater) – LBT/LMIRcam (Skrutskie)
• Io (other) – HST/STIS (Roth) – IRTF TEXES (Retherford) – WIND (Cecconi) – Nancay (Zarka)
https://docs.google.com/document/d/1MJzRgIRUZLkQ6qgbZT2A0ZWyhMUAacmPCSzHwg5-kv4/edit?pli=1
HST: detailed auroral morphology • The spatial resolution of EXCEED is too low to resolve
which region of the aurora is intensified. • Imaging by HST/STIS (125-170 nm) will provide high-res
snapshots of the morphology, revealing where the energy is being deposited.
• Spatially-resolved spectra (110-170 nm) obtained from HST/STIS slit spectroscopy can be used to determine the energy of the auroral electrons (10s keV).
Kitt Peak: low-energy e- in IPT
• The S and O ion emission line intensities observed by EXCEED are sensitive to electron temperatures in the range of a few 10s of keV.
• The Kitt Peak 4 m telescope in Arizona will be used to measure the lower energy component.
• S+ and S++ emission line ratios (visible wavelengths) are good indicators of the density of electrons at ~5 eV.
• Plasma torus at S+ emission line from Schneider &Traugher, 1985.
IRTF: Monitoring Io’s volcanic activity • Large eruptions eject material into Io’s atmosphere and
may be the cause of brightening in the Io Torus • Previous large eruptions observed in eclipse
occultations and reflected sunlight.
Keck: Rarog eruption
• Detected August 15 by dePater (Berkeley)
• Type of eruption likely to put large amounts of material into atmosphere and torus
• More observations requested
Lots more on e-mail discussion and…
• International Outer Planet Watch: http://bulldog2.redlands.edu/FacultyFolder/julie_rathbun/iopw/
• Contact [email protected] or [email protected] to join online google doc, calendar, and/or e-mail group