Archiv: Jupiter (space object / planet)


22.02.2020 - 22:39 [ CNN ]

The public is helping us see Jupiter like it’s never been seen before

„We do not have a formal imaging science team on Juno, so we have turned to the public to help us out,“ says Candice Hansen-Koharcheck, Juno co-investigator responsible for JunoCam.
The amateur astronomy community assists with planning, she explains, determining when JunoCam should photograph the planet and where. Once images are sent back to Earth, the public has access to raw data, which, with a little photo editing know-how, have been processed into some of the most stunning images yet seen of Jupiter.

25.05.2019 - 10:08 [ the Astronomical Journal ]

Historical and Contemporary Trends in the Size, Drift, and Color of Jupiter’s Great Red Spot

(13.03.2018)

Observations of Jupiter’s Great Red Spot (GRS) span more than 150 years. This allows for careful measurements of its size and drift rate. High spatial resolution spacecraft data also allow tracking of its spectral characteristics and internal dynamics and structure. The GRS continues to shrink in longitudinal length at an approximately linear rate of 0fdg194 yr−1 and in latitudinal width at 0fdg048 yr−1. Its westward drift rate (relative to System III W. longitude) has increased from ~0fdg26/day in the 1980s to ~0fdg36/day currently. Since 2014, the GRS’s short wavelength (<650 nm) reflectance has continued to decrease, while it has become brighter at 890 nm, indicating a change in clouds/haze at high altitudes. In addition, its north–south color asymmetry has decreased, and the dark core has become smaller.

25.05.2019 - 09:25 [ Nature.com ]

Less absorbed solar energy and more internal heat for Jupiter

(13.09.2018)

The radiant energy budget and internal heat are fundamental properties of giant planets, but precise determination of these properties remains a challenge.

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Furthermore, the significant wavelength dependency of Jupiter’s albedo implies that the radiant energy budgets and internal heat of the other giant planets in our solar system should be re-examined.

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Furthermore, the transfer and distribution of radiant energy within the atmospheric systems modify the thermal structure and hence generate the mechanical energy to drive atmospheric circulation, weather, and climate. The radiant energy budget and the related internal heat of the giant planets also bear upon their evolutionary history.

25.05.2019 - 09:19 [ Nature.com ]

Time variation of Jupiter’s internal magnetic field consistent with zonal wind advection

(20.05.2019)

However, of the six Solar System planets with active dynamos, secular variation has been firmly established only for Earth. Here, we compare magnetic field observations of Jupiter from the Pioneer 10 and 11, Voyager 1 and Ulysses spacecraft (acquired 1973–1992) with a new Juno reference model (JRM09)1. We find a consistent, systematic change in Jupiter’s field over this 45-year time span, which cannot be explained by changes in the magnetospheric field or by changing the assumed rotation rate of Jupiter.

25.05.2019 - 09:09 [ Scinexx.de ]

Jupiters Magnetfeld schwankt

(24.05.2019)

Und tatsächlich: „Wir finden eine konsistente, systematische Veränderung im Jupiter-Magnetfeld über die letzten 45 Jahre“, berichten die Forscher. „Etwas so Schwaches wie diese Schwankungen in etwas so Immensem wie dem Jupiterfeld zu finden war eine echte Herausforderung.“ Nähere Analysen ergaben, dass sich diese zeitlichen Veränderungen nicht durch äußere Einflüsse oder Schwankungen in der Rotation des Jupiter erklären lassen.