Jupiter temperature
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Jupiter Temperature Structure: Troposphere, Stratosphere, and Thermosphere
Tropospheric Temperatures on Jupiter
Jupiter’s troposphere, the lowest layer of its atmosphere, has temperatures that vary with location and time. At the 1 bar pressure level, which is often used as a reference, temperatures range from about 166 K to 170 K. This is based on updated analyses of Voyager radio occultation data and the Galileo probe, which show spatial variations of up to 7 K between different latitudes, such as 12°S and 0°N. The Galileo probe’s measurement of 166.1 K was taken in a particularly clear and dry region, while Voyager data suggest slightly higher values elsewhere on the planet . Long-term studies also reveal that Jupiter’s upper tropospheric temperatures (around 300 mbar) can vary over periods of 4 to 14 years, with different latitude bands showing independent and sometimes anti-correlated changes. These variations are not directly tied to seasonal solar heating, indicating complex atmospheric dynamics .
Stratospheric and Auroral Region Temperatures
In Jupiter’s stratosphere, especially near the auroral regions, temperatures can be significantly higher and show independent evolution between the northern and southern hemispheres. For example, at the 1 mbar level, the southern auroral region experienced a temperature increase of about 11 K over a two-year period, possibly linked to changes in charged particle precipitation and solar wind pressure. The northern auroral region, in contrast, remained relatively stable during the same period . These findings highlight the influence of both internal and external energy sources on Jupiter’s atmospheric temperatures.
Thermospheric and Upper Atmospheric Temperatures
Jupiter’s upper atmosphere, or thermosphere, is much hotter than what would be expected from solar heating alone. Recent high-resolution maps show that equatorial thermospheric temperatures are around 762 K, while temperatures within the auroral ovals can reach 1200 K in the north and 1143 K in the south. There is a smooth decrease in temperature from the auroral regions toward the equator, suggesting that auroral energy is redistributed dynamically across the planet. Localized cooler regions, about 30 K lower than their surroundings, have also been observed and are associated with magnetic field anomalies, indicating a strong magnetic influence on atmospheric temperatures .
The Galileo probe measured temperatures rising from 109 K at 175 mbar up to about 900 K at 1 nanobar in the upper atmosphere. Wavelike oscillations, likely caused by gravity waves, are present at all levels and are thought to contribute to the heating of the upper atmosphere Seiff1997Young1997. Models suggest that interactions between Jupiter’s magnetosphere and atmosphere play a key role in this heating, but even advanced models still underestimate the observed equatorial temperatures by several hundred kelvins, indicating that the full explanation for Jupiter’s “energy crisis” remains unresolved .
Temperature Variability and Atmospheric Dynamics
Jupiter’s atmospheric temperatures are not static; they show both spatial and temporal variability. The troposphere exhibits periodic temperature changes that are not directly linked to the planet’s seasons, and there are anti-correlated temperature patterns between hemispheres and between different atmospheric layers. These patterns suggest that stratospheric dynamics can influence tropospheric temperatures, pointing to a complex interplay between different atmospheric layers .
Hot Jupiters and Exoplanet Comparisons
Studies of exoplanets known as “hot Jupiters” show that their atmospheric temperatures can be much higher than those of Jupiter itself, with dayside temperatures rising abruptly at equilibrium temperatures between 1660 K and 1818 K. This transition is linked to changes in atmospheric structure, such as the onset of temperature inversions and the presence of certain molecules like carbon monoxide in emission. These findings help place Jupiter’s own atmospheric temperatures in context and inform models of giant planet atmospheres more broadly Deming2023Baxter2020Thorngren2019.
Conclusion
Jupiter’s atmospheric temperatures vary widely by altitude, latitude, and over time. The troposphere is cold, with temperatures near 170 K at 1 bar, while the thermosphere can reach over 1200 K in auroral regions. These high temperatures are driven by a combination of solar heating, internal dynamics, magnetospheric interactions, and wave-driven processes. Despite decades of study, the exact mechanisms behind Jupiter’s upper atmospheric heating remain an active area of research, with new observations and models continuing to refine our understanding of the giant planet’s complex climate system Roberts2025Gupta2022Seiff1997+4 MORE.
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Most relevant research papers on this topic
Spatiotemporal Variations of Temperature in Jupiter’s Upper Atmosphere
High-resolution H 3+ temperature maps show consistent pole-to-pole temperature structure in Jupiter's upper atmosphere, with temperatures decreasing smoothly from auroral to equatorial latitudes.
Jupiter's Temperature Structure: A Reassessment of the Voyager Radio Occultation Measurements
Jupiter's tropospheric temperatures may vary by up to 7 K between 7°N and 12°S, with the corrected temperature at 1 bar being up to 4 K greater than previously published values.
Thermal Structure of Jupiter's Upper Atmosphere Derived from the Galileo Probe
The Galileo Probe data suggests wavelike oscillations are the probable source of upper atmosphere heating in Jupiter, with temperatures increasing from 109 kelvin at the 175-millibar level to 900 40 kelvin at 1 nanobar.
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