TY - JOUR
T1 - Comparison of the Structure and Dynamics of Jupiter's Great Red SPOT between the Voyager 1 and 2 Encounters
AU - Sada, Pedro V.
AU - Beebe, Reta F.
AU - Conrath, Barney J.
PY - 1996/2/1
Y1 - 1996/2/1
N2 - We have consistently navigated the highest resolution images available
of Jupiter's Great Red Spot (GRS) from the Voyager ISS experiment. From
them we have measured apparent displacements of cloud features around
and within the Red Spot which can be interpreted as wind vectors. We
have used the wind field information to determine the circulation
characteristics of the collar and to map the relative vorticity and
horizontal divergence of the central GRS region. Color ratios and
ground-based data have been used to complement these observations.
Derived quantities from the IRIS data set taken simultaneously with the
Voyager images have been obtained in order to determine the thermal
structure, infrared cloud opacity,NH3abundance,
andparaH2fraction above the Great Red Spot. There is evidence
of non-chaotic activity in the central region of the Red Spot. Small
eddy structures consisting of coherent cloud features with apparently
two-dimensional turbulent motions are present in this region along with
larger classical cyclonic vortices. The surrounding anticyclonic collar
circulates with higher velocities and appears to be detached from the
core by an abrupt transition region. The central region appears to be
elevated over the surrounding collar and exhibits evidence for upwelling
and some outflow of material. Differences in the collar structure and
velocity profiles between the Voyager encounters can be attributed to
differences in the ingestion rate of westward-moving South Equatorial
Belt vortices caused by a blocking South Tropical Zone Disturbance
which, moving eastward, overtook and passed the Red Spot between the two
encounters. This disturbance appears to temporarily increase in
brightness during conjunctions with the Red Spot and has been tracked
for 20 years.
AB - We have consistently navigated the highest resolution images available
of Jupiter's Great Red Spot (GRS) from the Voyager ISS experiment. From
them we have measured apparent displacements of cloud features around
and within the Red Spot which can be interpreted as wind vectors. We
have used the wind field information to determine the circulation
characteristics of the collar and to map the relative vorticity and
horizontal divergence of the central GRS region. Color ratios and
ground-based data have been used to complement these observations.
Derived quantities from the IRIS data set taken simultaneously with the
Voyager images have been obtained in order to determine the thermal
structure, infrared cloud opacity,NH3abundance,
andparaH2fraction above the Great Red Spot. There is evidence
of non-chaotic activity in the central region of the Red Spot. Small
eddy structures consisting of coherent cloud features with apparently
two-dimensional turbulent motions are present in this region along with
larger classical cyclonic vortices. The surrounding anticyclonic collar
circulates with higher velocities and appears to be detached from the
core by an abrupt transition region. The central region appears to be
elevated over the surrounding collar and exhibits evidence for upwelling
and some outflow of material. Differences in the collar structure and
velocity profiles between the Voyager encounters can be attributed to
differences in the ingestion rate of westward-moving South Equatorial
Belt vortices caused by a blocking South Tropical Zone Disturbance
which, moving eastward, overtook and passed the Red Spot between the two
encounters. This disturbance appears to temporarily increase in
brightness during conjunctions with the Red Spot and has been tracked
for 20 years.
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-0030076349&origin=resultslist&sort=plf-f&src=s&sid=add814d9a8e7e0bb30e1809089c492ba&sot=b&sdt=b&sl=122&s=TITLE-ABS-KEY%28Comparison+of+the+Structure+and+Dynamics+of+Jupiter%27s+Great+Red+SPOT+between+the+Voyager+1+and+2+Encounters%29&relpos=0&citeCnt=52&searchTerm=
U2 - 10.1006/icar.1996.0022
DO - 10.1006/icar.1996.0022
M3 - Article
SN - 0019-1035
VL - 119
SP - 311
EP - 335
JO - Icarus
JF - Icarus
IS - 2
ER -