Using HST-STIS Observations of Auroral Lyα Line Profiles to Map High-Altitude Winds on Jupiter

Details Using HST-STIS Observations of Auroral Lyα Line Profiles to Map High-Altitude Winds on Jupiter Using HST-STIS Observations of Auroral Lyα Line Profiles to Map High-Altitude Winds on Jupiter

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa24a..02g&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA24A-02

Physics

0310 Airglow And Aurora, 5707 Atmospheres: Structure And Dynamics, 6220 Jupiter

Scientific paper

We present an analysis of several high-resolution long-slit echelle spectra of Jupiter's auroral Lyα emissions obtained by HST-STIS during the Cassini flyby of 12/2000-1/2001. We apply a velocity shear resonance line radiative transfer code to extract high-altitude wind velocities, using an asymmetry produced when the emergent self-reversed Lyα emission line is scattered by fast-moving H atoms high above the aurora. The neutral velocities thus extracted are complementary to the ion winds obtained by observations of Doppler-shifted auroral near-IR H3+ emissions, and provide constraints for the Jupiter Thermosphere General Circulation Model (JTGCM). The results highlight how Jupiter's aurora affect upper atmospheric dynamics on a global scale.

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