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Conversion from HST ACS and STIS auroral counts into brightness, precipitated power, and radiated power for H2 giant planets
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Conversion from HST ACS and STIS auroral counts into brightness, precipitated power, and radiated power for H2 giant planets
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Journal Article
Conversion from HST ACS and STIS auroral counts into brightness, precipitated power, and radiated power for H2 giant planets
2012
Overview
The STIS and ACS instruments onboard HST are widely used to study the giant planet's aurora. Several assumptions have to be made to convert the instrumental counts into meaningful physical values (type and bandwidth of the filters, definition of the physical units, etc…), but these may significantly differ from one author to another, which makes it difficult to compare the auroral characteristics published in different studies. We present a method to convert the counts obtained in representative ACS and STIS imaging modes/filters used by the auroral scientific community to brightness, precipitated power and radiated power in the ultraviolet (700–1800 Å). Since hydrocarbon absorption may considerably affect the observed auroral emission, the conversion factors are determined for several attenuation levels. Several properties of the auroral emission have been determined: the fraction of the H2 emission shortward and longward of the HLy‐α line is 50.3% and 49.7% respectively, the contribution of HLy‐α to the total unabsorbed auroral signal has been set to 9.1% and an input of 1 mW m−2 produces 10 kR of H2 in the Lyman and Werner bands. A first application sets the order of magnitude of Saturn's auroral characteristics in the total UV bandwidth to a brightness of 10 kR and an emitted power of ∼2.8 GW. A second application uses published brightnesses of Europa's footprint to determine the current density associated with the Europa auroral spot: 0.21 and 0.045 μA m−2 assuming no hydrocarbon absorption and a color ratio of 2, respectively. Factors to extend the brightnesses observed with Cassini‐UVIS to total H2 UV brightnesses are also provided. Key Points Gives tools to convert observed data to data in physical units Provides key numbers to characterize auroral parameters Will help to uniformize studies made by different authors
Publisher
Blackwell Publishing Ltd,American Geophysical Union,American Geophysical Union (AGU)
Subject
/ 5704
/ ACS
/ Atmospheric Composition and Structure: Airglow and aurora
/ Atmospheric Composition and Structure: Instruments and techniques
/ Atmospheric Composition and Structure: Planetary atmospheres
/ Atmospheric Composition and Structure: Thermosphere: energy deposition
/ aurora
/ Auroras
/ Aérospatiale, astronomie & astrophysique
/ Exact sciences and technology
/ Filters
/ Magnetospheric Physics: Auroral phenomena
/ Physical, chemical, mathematical & earth Sciences
/ Physique, chimie, mathématiques & sciences de la terre
/ Planets
/ Scientific apparatus & instruments
/ Space science, astronomy & astrophysics
/ STIS
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