“You have a deep band of ammonia that goes from the top of Jupiter as deep as we can see.
It goes down to 350 kilometers (217 miles) because that’s the limit of where we’re looking.”
Space Flight Now
May 27, 2017
If Albert Gore Junior had done the same we wouldn’t still have druids and socialists running around selling so-called climate exchange credits.
The ammonia band may penetrate even deeper inside Jupiter, Bolton said.
The first months of observations of the solar system’s biggest planet from NASA’s Juno spacecraft have revealed huge swirling polar cyclones, previously undetected structures and motions beneath Jupiter’s distinctive clouds, and the first evidence for what lies at the core of the gas giant, scientists said Thursday.
There was plenty scientists did not know about the planet when the Juno spacecraft left Earth in 2011, and the probe has sought answers to questions about Jupiter’s interior, magnetic field, auroras and radiation belts, and used a visible light camera to capture the first direct views of the poles.
“The general theme of our discoveries is really how different Jupiter looks from what we expected,” said Scott Bolton, Juno’s principal investigator at the Southwest Research Institute in San Antonio. “Juno, in many ways, is looking inside Jupiter for the first time, close-up and personal.”
Since Juno arrived at its destination July 4, 2016, to wrap up a five-year interplanetary trip, the spacecraft, built and operated by Lockheed Martin, has circled Jupiter six times in an oval-shaped loop that extends a few million miles at its farthest point. Each lap takes more than 53 days, and Juno speedily skirts within 3,000 miles (5,000 kilometers) Jupiter’s cloud tops at closest approach.
Juno’s science instruments collect most of their data when the orbiter is near Jupiter, taking pictures, measuring plasma and electrons, and probing deep inside the planet to find out what is hidden under its cloudy veneer.
Many scientists thought Jupiter was “relatively boring and uniform” inside before Juno arrived, Bolton said.
“For decades, scientists have assumed this, that if we drop below the cloud tops, below where the sunlight reaches, that pretty much Jupiter was all uniform inside, and it really didn’t matter where you looked, it would all look the same,” Bolton said Thursday. “And what we’re finding is anything but that is the truth. It’s very different and very complex.”
Juno’s microwave radiometer, an instrument similar to those aboard climate satellites looking down on Earth, gathers sounding measurements to peer below the red-orange tapestry of Jupiter’s cloud tops.
The radiometer is tuned to six wavelengths, detecting thermal radiation emitted from different layers of the atmosphere from the storm clouds and jet streams to as deep as 300 miles, or about 500 kilometers.
Going into Juno’s mission, scientists anticipated Jupiter’s atmosphere to be relatively consistent deeper than 60 miles, or 100 kilometers.
Instead, Juno’s microwave radiometer discovered a belt of ammonia around Jupiter’s equator and variations in ammonia abundances at other latitudes extending deep into the planet’s atmosphere.
“What this is telling us is that Jupiter is not very well-mixed,” Bolton said. “It’s not all uniform inside. The idea of, once you drop below the sunlight, that everything would all be uniform, boring and mixed up was completely wrong. It’s actually very different depending on where you look.”
The findings suggest more ammonia farther down in Jupiter’s atmosphere, and the ammonia detections appear to have no relationship with the zones and belts of clouds visible in pictures from space.
“That’s really going to force us to rethink not only how Jupiter works, but how do we explore Saturn, Uranus, and Neptune if they are highly variable like this?” Bolton said.
Other parts of Juno’s scientific sensor suite are mapping Jupiter’s gravity field to learn about the heart of the planet.
“When we went to go measure the gravity field, what we were really looking for was the core — whether there was a compact core or no core,” Bolton said.
“Instead, what we found was that it really looks fuzzy. There may be a core there, but it’s very big, and it may be partially dissolved. We’re studying that, but that came as a big surprise to us that there was no core.”
Theories about Jupiter’s core before Juno arrived predominately predicted the planet either had a small, dense rocky core between one and 10 times as massive as Earth or no core at all, scientists said.
“Most scientists were in one camp or the other, and what we found was really neither was true,” Bolton said.
“There may be a little bit of a compact core, but there may be layers there, and there seems to be a fuzzy core that may be much larger than anybody had anticipated.
“The gravity data that we’ve gotten thus far is not really consistent with just a small compact core or zero core, but it is somewhat consistent with a large fuzzy core that may be partially dissolved,” Bolton said. “It’s also consistent, maybe, with some deep motions, or zonal winds and things like that … dictating the interior of Jupiter’s dynamics, which are very different from historically models have assumed.”
Jupiter’s intense magnetic field, the strongest of any planet in the solar system, has also been interrogated by Juno, which has a magnetometer mounted at the end of one of the craft’s three solar array wings.
Jack Connerney, Juno’s deputy principal investigator at NASA’s Goddard Space Flight Center in Maryland, described the magnetometer as like a “fancy compass” that can measure the direction and strength of Jupiter’s magnetic field.
Juno has come closer to Jupiter than any mission before, and proximity yields better magnetic field measurements, Connerney said.
See the entire article below.