Featured Research

from universities, journals, and other organizations

Cassini Camera Visualizes The Invisible During Jupiter Flyby

January 24, 2001
Johns Hopkins University
A camera known as MIMI is helping scientists see the unseeable during Cassini's six-month swing around Jupiter.

Cassini's recent pictures of Jupiter are providing scientists with never-before-seen images of the giant planet's magnetosphere and underlying dynamics.

NASA's $3.4 billion Cassini spacecraft is presently in a six-month flyby of Jupiter during a gravity-assisted swing toward Saturn and a four-year study of the ringed planet that will begin in July 2004. Researchers using the flyby as an opportunity to try out some of Cassini's advanced instrumentation are reaping scientific rewards.

"Every new spacecraft carries instruments that expand our ability to see things," says Dr. Stamatios Krimigis, Space Department Head at The Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md., and principal investigator for the Magnetospheric Imaging Instrument (MIMI) aboard Cassini. "With MIMI, we're able to visualize the invisible."

The MIMI instrument includes an Ion and Neutral Camera developed by APL, a spectrometer built by the University of Maryland under Dr. Douglas Hamilton, and a high energy particle detector developed by Dr. Stefano Livi of APL and a number of co-investigator institutions. "By detecting various energetic particles and discriminating among them according to energy and mass, the camera is able to obtain remote images of the global distribution of these particles," says Dr. Donald Mitchell of APL, who leads the camera science team.

From a distance of 6 million miles (9.7 million kilometers), MIMI's camera has recorded pictures of Jupiter's energetic particle-filled magnetosphere. Sequenced into a movie, these images will eventually provide a large-scale look at the compression and expansion of magnetospheres as they are buffeted by solar winds.

"These images, when combined with the other MIMI measurements, demonstrate the ability of the camera to capture not only the shape and dynamics of the magnetosphere but also elements of its chemical composition," says Krimigis. "They reveal that the particles we're detecting – primarily hydrogen, but also oxygen, sulfur and sulfur dioxide – are spewed from volcanoes on the Jovian moon Io and spun out into Jupiter's magnetosphere, where they are trapped, energized and accelerated to high velocities. Then, when collisions with other particles provide them with an electron, they become neutral and are able to escape the magnetosphere. And that's when we can detect them with our camera."

In addition to imaging the Jovian magnetosphere, MIMI's instruments have also detected the presence of a huge nebula of particles enveloping Jupiter and extending out to at least 13 million miles (22 million kilometers) from the planet, according to Hamilton, the developer of another MIMI sensor that detected oxygen, sodium, sulfur, potassium and sulfur dioxide. "All of these are constituents of the gas spewed out by Io's volcanoes, thrown out of Jupiter's magnetosphere and eventually picked up by the flowing solar wind," says Hamilton. Other observations include detection of flowing electrons along the planetary magnetic field inside Jupiter's magnetosphere, according to Livi, who developed the magnetic spectrometer sensor.

Closer to home, MIMI technology -- in the form of a High Energy Neutral Analyzer (HENA) instrument -- is orbiting Earth in NASA's Imager for Magnetospheric to Aurora Global Exploration (IMAGE) satellite, launched in March 2000. IMAGE obtained the first global image of the Earth's magnetosphere, the shell of positively charged ions and negatively charged electrons that lies atop our atmosphere and extends far out into space, says Mitchell.

"By improving our ability to visualize a planet's magnetosphere -- whether here or at other planets of the solar system -- we are better equipped to monitor its space weather," says Krimigis. "This will benefit science and, in the case of Earth, may lead to space weather forecasts that will give advance warning of electromagnetic storms, which in the past have disrupted communications and crippled electrical power grids."

Cassini's pictures of Jupiter and its magnetosphere are available on-line.

The Applied Physics Laboratory is a not-for-profit laboratory and division of The Johns Hopkins University. APL conducts research and development primarily for national security and for nondefense projects of global significance.

Story Source:

The above story is based on materials provided by Johns Hopkins University. Note: Materials may be edited for content and length.

Cite This Page:

Johns Hopkins University. "Cassini Camera Visualizes The Invisible During Jupiter Flyby." ScienceDaily. ScienceDaily, 24 January 2001. <www.sciencedaily.com/releases/2001/01/010123091813.htm>.
Johns Hopkins University. (2001, January 24). Cassini Camera Visualizes The Invisible During Jupiter Flyby. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2001/01/010123091813.htm
Johns Hopkins University. "Cassini Camera Visualizes The Invisible During Jupiter Flyby." ScienceDaily. www.sciencedaily.com/releases/2001/01/010123091813.htm (accessed July 23, 2014).

Share This

More Space & Time News

Wednesday, July 23, 2014

Featured Research

from universities, journals, and other organizations

Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Cargo Craft Undocks from Space Station

Raw: Cargo Craft Undocks from Space Station

AP (July 22, 2014) A Russian Soyuz cargo-carrying spacecraft undocked from the International Space Station on Monday. The craft is due to undergo about ten days of engineering tests before it burns up in the Earth's atmosphere. (July 22) Video provided by AP
Powered by NewsLook.com
NASA Ceremony Honors Moon Walker Neil Armstrong

NASA Ceremony Honors Moon Walker Neil Armstrong

AP (July 21, 2014) NASA honored one of its most famous astronauts Monday by renaming a historic building at the Kennedy Space Center in Florida. It now bears the name of Neil Armstrong, the first man to walk on the moon. (July 21) Video provided by AP
Powered by NewsLook.com
Neil Armstrong's Post-Apollo 11 Life

Neil Armstrong's Post-Apollo 11 Life

Newsy (July 19, 2014) Neil Armstrong gained international fame after becoming the first man to walk on the moon in 1969. But what was his life like after the historic trip? Video provided by Newsy
Powered by NewsLook.com
This Week @ NASA, July 18, 2014

This Week @ NASA, July 18, 2014

NASA (July 18, 2014) Apollo 11 yesterday, Next Giant Leap tomorrow, Science instruments for Europa mission, and more... Video provided by NASA
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.


Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News


Free Subscriptions

Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile

Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?

Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins