Stellar Occultation Observations of Saturn's North-Polar Temperature Structure
نویسندگان
چکیده
منابع مشابه
Stellar Occultation Observations of Saturn's North-polar Temperature Structure
We have observed a stellar occultation of GSC5249-01240 by Saturn's north polar region on November 20, 1995 from NASA's Infrared Telescope Facility (IRTF). This is the first recorded occultation by the polar region of a giant planet. The occulted region extends 88 km in vertical height and 660 km in horizontal length, over a region from 82.5 to 85 degrees in planetocentric latitude and from 20 ...
متن کاملStellar Occultation Saturn ' s Upper Observations of Atmosphere
We have analyzed three stellar occultation observations of Saturn's upper atmosphere during the years 1989 to 1995. These occultations probed the stratosphere at pressure levels about 0.5 to 20 pbars, intermediate to those probed by the Pioneer 11, Voyager I and II radio and ultraviolet occultations. The time span of the earlier occultations and the observation of a higher latitude occultation ...
متن کاملPolar branches of stellar activity waves: dynamo models and observations
Aims. Stellar activity data provide evidence of activity wave branches propagating polewards rather than equatorwards (the solar case). This evidence is especially pronounced for the well-observed subgiant HR 1099. Stellar dynamo theory allows polewards propagating dynamo waves for certain governing parameters. In this paper, we try to unite observations and theory. Methods. Taking into account...
متن کاملObservations of a successive stellar occultation by Charon and graze by Pluto in 2011
Introduction: Since the late 1980s, stellar occultations have provided snapshots of the Pluto system and specifically of Pluto’s atmospheric evolution. The lower atmosphere, below roughly half-light level in an occultation light curve, has changed distinctly over time (e.g. [1, 2]). Theorized explanations for the lower atmospheric structure include a steep thermal gradient and/or extinction, th...
متن کاملOccultation of young stellar objects by circumstellar disks I. Theoretical expectations and preliminary comparison with observations
The hypothesis that partial occultation of young stars by their circumstellar disks is responsible for UX Ori and T Tauri Type III photometric variability is quantitatively studied. We construct accretion disk models in which reprocessing of stellar and accretion luminosity leads to flaring of the disk (assumed to be in vertical hydrostatic equilibrium), and compute the probability to observe t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Icarus
سال: 1998
ISSN: 0019-1035
DOI: 10.1006/icar.1998.5901