Vertically-resolved observations of Jupiter’s quasi-quadrennial oscillation from 2012 to 2019. (arXiv:2006.15247v1 [astro-ph.EP])

Vertically-resolved observations of Jupiter’s quasi-quadrennial oscillation from 2012 to 2019. (arXiv:2006.15247v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Giles_R/0/1/0/all/0/1">Rohini S Giles</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Greathouse_T/0/1/0/all/0/1">Thomas K Greathouse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cosentino_R/0/1/0/all/0/1">Richard G Cosentino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Orton_G/0/1/0/all/0/1">Glenn S Orton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lacy_J/0/1/0/all/0/1">John H Lacy</a>

Over the last eight years, a rich dataset of mid-infrared CH4 observations
from the TEXES instrument at IRTF has been used to characterize the thermal
evolution of Jupiter’s stratosphere. These data were used to produce
vertically-resolved temperature maps between latitudes of 50{deg}S and
50{deg}N, allowing us to track approximately two periods of Jupiter’s
quasi-quadrennial oscillation (QQO). During the first five years of
observations, the QQO has a smooth sinusoidal pattern with a period of
4.0$pm$0.2 years and an amplitude of 7$pm$1 K at 13.5 mbar (our region of
maximum sensitivity). In 2017, we note an abrupt change to this pattern, with
the phase being shifted backwards by ~1 year. Searching for possible causes of
this QQO delay, we investigated the TEXES zonally-resolved temperature
retrievals and found that in May/June 2017, there was an unusually warm thermal
anomaly located at a latitude of 28{deg}N and a pressure of 1.2 mbar, moving
westward with a velocity of 19$pm$4 m/s. We suggest that there may be a link
between these two events.

Over the last eight years, a rich dataset of mid-infrared CH4 observations
from the TEXES instrument at IRTF has been used to characterize the thermal
evolution of Jupiter’s stratosphere. These data were used to produce
vertically-resolved temperature maps between latitudes of 50{deg}S and
50{deg}N, allowing us to track approximately two periods of Jupiter’s
quasi-quadrennial oscillation (QQO). During the first five years of
observations, the QQO has a smooth sinusoidal pattern with a period of
4.0$pm$0.2 years and an amplitude of 7$pm$1 K at 13.5 mbar (our region of
maximum sensitivity). In 2017, we note an abrupt change to this pattern, with
the phase being shifted backwards by ~1 year. Searching for possible causes of
this QQO delay, we investigated the TEXES zonally-resolved temperature
retrievals and found that in May/June 2017, there was an unusually warm thermal
anomaly located at a latitude of 28{deg}N and a pressure of 1.2 mbar, moving
westward with a velocity of 19$pm$4 m/s. We suggest that there may be a link
between these two events.

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