crta
Hrvatska znanstvena Sekcija img
bibliografija
3 gif
 Naslovna
 O projektu
 FAQ
 Kontakt
4 gif
Pregledavanje radova
Jednostavno pretraživanje
Napredno pretraživanje
Skupni podaci
Upis novih radova
Upute
Ispravci prijavljenih radova
Ostale bibliografije
Slični projekti
 Bibliografske baze podataka

Pregled bibliografske jedinice broj: 215670

Zbornik radova

Autori: Verbanac, Giuliana; de Pater, Imke; Showalter, Mark; Martin, Schuleen; Lissauer, Jack
Naslov: Keck Infrared Observations of Saturn's Main Rings Surrounding Earth's August 1995 Ring Plane Crossing.
( Keck Infrared Observations of Saturn's Main Rings Surrounding Earth's August 1995 Ring Plane Crossing. )
Izvornik: Geophysical Research AbstractsBeč :
Skup: European Geosciences Union
Mjesto i datum: Beč, Austrija, 24-29.04.2005
Ključne riječi: planetary rings; Saturn; photometry
( planetary rings; Saturn; photometry )
Sažetak:
We present results of near-infrared (2.26 micrometers) observations of Saturn's main rings taken with the W. M. Keck telescope during August 8-11, 1995, surrounding the time that Earth crossed Saturn's ring plane. These observations provide a unique opportunity to study the evolution of the ring brightness in detail, and by combining our data with Hubble Space Telescope (HST) results (Nicholson et al., 1996, Science #272, p.453-616), we extend the 12-hour HST time span to several days around the time of ring plane crossing (RPX). In this paper, we focus on the temporal evolution of the brightness in Saturn's main rings. We examine both edge-on ring profiles and radial profiles obtained by "onion-peeling" the edge-on data. Before RPX, when the dark (unlit) face of the rings was observed, the inner C ring (including the Colombo gap), the Maxwell gap, Cassini Division and F ring region were very bright in transmitted light. After RPX, the main rings brighten rapidly, as expected. The profiles show east-west asymmetries both before and after RPX\null. Prior to RPX, the evolution in ring brightness of the Keck and HST data match one another quite well. The west side of the rings showed a non-linear variation in brightness during the last hours before ring plane crossing, suggestive of clumping and longitudinal asymmetries in the F ring. Immediately after RPX, the east side of the rings brightened more rapidly than the west. A quantitative comparison of the Keck and HST data reveals that the rings were redder before RPX than after ; we ascribe this difference to the enhanced multiple scattering of photons passing through to the unlit side of the rings.
Vrsta sudjelovanja: Poster
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0119336
Izvorni jezik: eng
Kategorija: Znanstveni
Znanstvena područja:
Fizika



Verzija za printanje   za tiskati


upomoc
foot_4