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--- jive_in_nm [2025/09/17 17:04] – [Updates] jasonj
+++ jive_in_nm [2025/09/17 19:36] (current) – [Details of the Instrument] jasonj
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 ==== Updates =====
-September 2025. This is a unique year for Saturn as it's at equinox and its rings are mostly hidden from view. We received support from the New Mexico Space Grant Consortium to carry out observations at Saturn opposition. Fortunately, the sites in Japan and France are also operating and we hope to have some quasi-continuous data this year.
+__September 2025__. This is a unique year for Saturn as it's at equinox and its rings are mostly hidden from view. We received support from the New Mexico Space Grant Consortium to carry out observations at Saturn opposition. Fortunately, the sites in Japan and France are also operating and we hope to have some quasi-continuous data this year.
 Here is a tip-tilt animation of Saturn from September 16, 2025.
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 No such Jovian ground-based instrument with these capabilities exists, nor does one for current or planned space missions to the giant planets. JIVE is an imaging spectrometer specifically designed to help achieve the scientific goals of this project and to meet these technical specifications. It will measure the Doppler shift in solar absorption lines from light that is reflected by clouds in Jupiter's upper troposphere, providing spatially resolved line-of-sight velocity images of the whole planet at that altitude. More precisely, JIVE is a Fourier transform tachometer that will simultaneously produce a visible image and a Doppler-velocity image of the planet at a regular temporal interval.
+{{:wiki:jive:jupiter2.mp4?direct&350 | Europa and Jupiter. Credit: Sean Sellers}}
 Jovian oscillation periods and wavelengths dictate the rate and resolution that JIVE samples the surface velocity. Thus, JIVE is designed to provide Doppler-velocity images every 1 minute with a spatial resolution of about 1 arcsec (dependent on seeing), corresponding on average to about 3000 km on Jupiter (diameter of 140,000 km), or about 6000 km on Saturn (diameter of 120,000 km). The velocity images will be used to compute seismic observables like power spectra for mode identification, and can be averaged to obtain a latitudinal profile of winds sensitive to 1-2 m/s fluctuations.
 JIVE is operated at the Dunn Solar Telescope at Sacramento Peak in Sunspot, NM.
 ==== JIVE and Juno ====
 [{{:wiki:science:rt.png?direct&400 |Fig. 4. JIVE and Juno are complementary. The blue box shows the interior range of Jupiter that will be possible to seismically explore with modes detected with JIVE. This includes a deep-interior program (light blue) using low-degree modes, and an envelope program (darker blue) for higher-degree up to l=25 when there is good telescope seeing. The red box shows the near-surface sensitivity possible from gravimetry with the Juno mission. Probe depths of a few example modes at the given frequencies and angular degree are shown (solid lines), as well as the expected transition locations for current Jupiter models (dashed lines). The x-scale is logarithmic. (Click for a larger image) }}]