Hola amigos: A VUELO DE UN QUINDE EL BLOG., la Agencia Espacial NASA, nos hace llegar la información de la vista captada al Satélite Titán del Planeta Saturno, y para poder explicar la visión captada nos dice: ..."En lo alto de la atmósfera de Titán, grandes manchas de dos gases traza brillan cerca del polo norte, en el lado de la oscuridad de la luna, y cerca del polo sur, en el lado del amanecer. Colores más brillantes indican señales más fuertes de los dos gases, HNC (izquierda) y HC3N (derecha); tonos rojos indican las señales menos pronunciadas......
Los nuevos mapas del satélite Titán de Saturno revelan grandes manchas de gases traza que brillan intensamente cerca de los polos norte y sur. Estas regiones se desplazan curiosamente fuera de los polos, al este o al oeste, por lo que el amanecer se está rompiendo a través de la región del sur, mientras que la oscuridad está cayendo sobre el norte........
El par de lo que se podría llamar : "parches" fue descubierto por un equipo internacional dirigido por los investigadores de la NASA para estudiar la composición química de la atmósfera de Titán......"
High in the atmosphere of Titan, large patches of
two trace gases glow near the north pole, on the dusk side of the moon, and near
the south pole, on the dawn side. Brighter colors indicate stronger signals from
the two gases, HNC (left) and HC3N (right); red hues indicate less pronounced
signals.
Image Credit:
NRAO/AUI/NSF
New
maps of Saturn’s moon Titan reveal large patches of trace gases shining brightly
near the north and south poles. These regions are curiously shifted off the
poles, to the east or west, so that dawn is breaking over the southern region
while dusk is falling over the northern one.
The pair of patches was spotted by a NASA-led international team of
researchers investigating the chemical make-up of Titan’s atmosphere.
“This is an unexpected and potentially groundbreaking discovery,” said Martin
Cordiner, an astrochemist working at NASA’s Goddard Space Flight Center in
Greenbelt, Maryland, and the lead author of the study. “These kinds of
east-to-west variations have never been seen before in Titan’s atmospheric
gases. Explaining their origin presents us with a fascinating new problem.”
The mapping comes from observations made by the Atacama Large
Millimeter/submillimeter Array (ALMA), a network of high-precision antennas in
Chile. At the wavelengths used by these antennas, the gas-rich areas in Titan’s
atmosphere glowed brightly. And because of ALMA’s sensitivity, the researchers
were able to obtain spatial maps of chemicals in Titan’s atmosphere from a
“snapshot” observation that lasted less than three minutes.
Titan’s atmosphere has long been of interest because it acts as a chemical
factory, using energy from the sun and Saturn’s magnetic field to produce a wide
range of organic, or carbon-based, molecules. Studying this complex chemistry
may provide insights into the properties of Earth’s very early atmosphere, which
may have shared many chemical characteristics with present-day Titan.
In this study, the researchers focused on two organic molecules, hydrogen
isocyanide (HNC) and cyanoacetylene (HC3N), that are formed in
Titan’s atmosphere. At lower altitudes, the HC3N appears concentrated
above Titan’s north and south poles. These findings are consistent with
observations made by NASA’s Cassini spacecraft, which has found a cloud cap and
high concentrations of some gases over whichever pole is experiencing winter on
Titan.
The surprise came when the researchers compared the gas concentrations at
different levels in the atmosphere. At the highest altitudes, the gas pockets
appeared to be shifted away from the poles. These off-pole locations are
unexpected because the fast-moving winds in Titan’s middle atmosphere move in an
east–west direction, forming zones similar to Jupiter’s bands, though much less
pronounced. Within each zone, the atmospheric gases should, for the most part,
be thoroughly mixed.
The researchers do not have an obvious explanation for these findings
yet.
“It seems incredible that chemical mechanisms could be operating on rapid
enough timescales to cause enhanced 'pockets' in the observed molecules,” said
Conor Nixon, a planetary scientist at Goddard and a coauthor of the paper,
published online today in the Astrophysical Journal Letters. “We would expect
the molecules to be quickly mixed around the globe by Titan’s winds.”
At the moment, the scientists are considering a number of potential
explanations, including thermal effects, previously unknown patterns of
atmospheric circulation, or the influence of Saturn’s powerful magnetic field,
which extends far enough to engulf Titan.
Further observations are expected to improve the understanding of the
atmosphere and ongoing processes on Titan and other objects throughout the solar
system.
NASA’s Astrobiology Program supported this work through a grant to the
Goddard Center for Astrobiology, a part of the NASA Astrobiology Institute.
Additional funding came from NASA’s Planetary Atmospheres and Planetary
Astronomy programs. ALMA, an international astronomy facility, is funded in
Europe by the European Southern Observatory, in North America by the U.S.
National Science Foundation in cooperation with the National Research Council of
Canada and the National Science Council of Taiwan, and in East Asia by the
National Institutes of Natural Sciences of Japan in cooperation with the
Academia Sinica in Taiwan.
Nancy Neal-Jones /
Elizabeth Zubritsky
NASA's Goddard Space Flight Center, Greenbelt, Md.
301-286-0039 / 301-614-5438
nancy.n.jones@nasa.gov / elizabeth.a.zubritsky@nasa.gov
NASA's Goddard Space Flight Center, Greenbelt, Md.
301-286-0039 / 301-614-5438
nancy.n.jones@nasa.gov / elizabeth.a.zubritsky@nasa.gov
NASA
Guillermo Gonzalo Sánchez Achutegui
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