As shuttle's career nears an end, NASA turns focus to satellites

Dec 26, 2009 By Mark K. Matthews, The Orlando Sentinel

NASA heads into 2010 with the bittersweet assignment of retiring the space shuttle after nearly three decades. But that's not all the agency has planned: There are also launches of three new satellites aimed at better understanding the Earth's climate and oceans, and the sun.

Two of the probes will examine Earth _ specifically the concentration of salt in the world's oceans and the presence of aerosol particles, such as soot, in the atmosphere. A third mission will study the sun and its effect on space weather including solar flares that can disrupt communication on Earth.

All three come at a critical time for NASA. Data from the two Earth probes will likely influence global-warming research, and the trio of launches could serve as bright spots in a year otherwise dominated by debate over the future of the agency's .

"They are extraordinary timely," said Michael Freilich, head of NASA's Earth-science division, of the two Earth probes. "It is a quest for understanding of the Earth system and (to improve) our ability to predict how our wonderful environment and our planet is going to change in the future."

Combined, the three missions will cost more than $1.5 billion.


SOLAR DYNAMICS OBSERVATORY:

  • Launch: Feb. 3 from Cape Canaveral Air Force Station
  • Cost: $844 million
  • Mission duration: At least five years
  • Overseen by: Goddard Space Flight Center in Maryland
  • SDO's mission: Study how the sun works and its effect on space weather.


Predicting weather in space can be tricky. Scientists hope this satellite can help astronomers better anticipate the solar flares, sunspots and magnetic storms that come from the sun and can jeopardize astronauts in space and electrical communications on Earth.

The Solar Dynamics Observatory will carry three instruments meant to meticulously document solar activity: a high-speed camera, a device that will record the sun's ultraviolet brightness and an imager that uses sounds waves to map the sun's interior _ similar to how an ultrasound produces fetal images.

The aim is to better understand the sun's magnetic field, which influences the development of sunspots, solar flares and magnetic storms, called coronal mass ejections. That in turn should enable better forecasting of solar eruptions, in much the same way hurricane forecasters use broad climate conditions to estimate the number of storms each season.

The key is learning more about the sun's solar cycle, which every 11 years or so flips the star's magnetic pole from north to south (or back again). This change triggers intense solar activity and blasts cosmic rays toward Earth that can disrupt cell phones and cause widespread blackouts.

"The sun hasn't changed very much. But human technology has. So it's more important to understand the sources of the ways these changes affect Earth," said Barbara Thompson, SDO deputy project scientist.


AQUARIUS:

  • Launch: TBD in 2010 from Vandenberg Air Force Base, Calif.
  • Cost: $273 million ( contribution only; this is a joint U.S./Argentine mission)
  • Mission duration: At least three years
  • Overseen by: Jet Propulsion Laboratory in California

Aquarius' mission: Provide global measurements of saline levels in seawater and how that relates to Earth's water cycle.

For the past 100 years, scientists have relied on ships and buoys to provide estimates on how salt is distributed throughout the world's oceans. The readings were incomplete, however, and didn't provide timely readings of changes in salinity.

The Aquarius satellite could change that. Using three onboard radiometers that can detect small changes in salt levels, it will enable scientists _ for the first time _ to build a global map of ocean-surface salinity and track how salt moves through ocean currents.

The new data could be critical in learning how ocean circulation and weather patterns such as El Nino, respond to global warming. Fluctuations in salt levels generally result from fluctuations in rainfall and evaporation, said Gary Lagerloef, the project's principal investigator.

For instance, the readings could give oceanographers a better idea of how fresh water from melting polar ice caps is being distributed globally.

Aquarius will be carried aloft by the SAC-D spacecraft, built by the Argentine Space Agency. Argentina, whose coastline approaches Antarctica, will use data to monitor salinity _ and melting ice _ off its southern coast.

"We want to utilize this data to improve our climate models. ... We don't know what the fate of the water (from melting polar ice caps) is," Lagerloef said.


GLORY:

  • Launch: Oct. 9 from Vandenberg Air Force Base
  • Cost: $419 million
  • Mission duration: At least three years
  • Overseen by: in Maryland


Glory's mission: Observe the effects of aerosolized particles on the Earth's climate.

One of the big questions in global-warming research is the effect of aerosolized particles _ from smog, auto exhaust, factory chimneys, volcanic eruptions and myriad other sources _ on Earth's temperature.

It is thought that aerosols could counteract the effects of greenhouse warming caused by growing levels of carbon dioxide by deflecting some of the sun's rays. Major volcanic eruptions, for instance, have lowered global temperatures for several years by flinging sulfur dioxide into the atmosphere, which acts as a kind of sunscreen.

But scientists have been unable to accurately measure the influence of aerosols _ or even say with certainty that all of them have a cooling effect. Some climatologists have suggested that black-carbon aerosols _ such as soot _ actually absorb the sun's heat, rather than reflect it, and result in a warmer Earth.

The Glory probe will try to catalog the different types of aerosols in the atmosphere. Understanding the composition could help scientists better understand their net effect on climate change.

"We know that aerosols are having a significant effect, but we don't know the magnitude of that effect," said Michael Mishchenko, the project's chief scientist.

Explore further: Testing immune cells on the International Space Station

4.4 /5 (9 votes)
add to favorites email to friend print save as pdf

Related Stories

Satellites Will Improve Understanding of the Sun

Aug 17, 2006

NASA's Solar Terrestrial Relations Observatory mission will dramatically improve understanding of the powerful solar eruptions that can send more than a billion tons of the sun's outer atmosphere hurtling into ...

Halloween Storms of 2003 Still the Scariest

Oct 29, 2008

(PhysOrg.com) -- By the eerie light of a Halloween moon, while a chilly wind blows autumn-dry leaves askitter on bare and fingered branches, scary things can happen. Blood-sucking bats, creepy-crawly spiders, ...

Recommended for you

Testing immune cells on the International Space Station

13 hours ago

The human body is fine-tuned to Earth's gravity. A team headed by Professor Oliver Ullrich from the University of Zurich's Institute of Anatomy is now conducting an experiment on the International Space Station ...

Easter morning delivery for space station

19 hours ago

Space station astronauts got a special Easter treat: a cargo ship full of supplies. The shipment arrived Sunday morning via the SpaceX company's Dragon cargo capsule.

NASA's space station Robonaut finally getting legs

Apr 19, 2014

Robonaut, the first out-of-this-world humanoid, is finally getting its space legs. For three years, Robonaut has had to manage from the waist up. This new pair of legs means the experimental robot—now stuck ...

Sun emits a mid-level solar flare

Apr 18, 2014

The sun emitted a mid-level solar flare, peaking at 9:03 a.m. EDT on April 18, 2014, and NASA's Solar Dynamics Observatory captured images of the event. Solar flares are powerful bursts of radiation. Harmful ...

User comments : 2

Adjust slider to filter visible comments by rank

Display comments: newest first

Bob_B
not rated yet Dec 28, 2009
Get used to the USA not being leaders in science and technology. Satellite launches will achieve little but more spying and more money for communications corporations.

You USA folks are just to wrapped up in religious wars to advance. Look at the Mid-East. They used to be quite advanced, the invention of Algebra occurred there. Now it is just a religious war zone.

America has become a religious war zone. The internal arguing between factions of Christians has created a wall between 'citizens'. Citizen A wants the laws to be so that Citizen B can not do this, or that (we are not talking murder here), just things like taking birth control, or getting a tooth worked on when needed but those "Citizen A" folks don't want others to be "helped." They have not earned it, so let them suffer until they want to get off their asses and work so they can afford to see a dentist.

zevkirsh
not rated yet Dec 28, 2009


$$ constraints are finally brinnging nasa down to earth.

the need to economized , will neccessitate amazing gains in payload-price reducing technologies. , the easy gains will be made within 20 years, and this will usher in a new future golden era of space exploration by intelligent, curious, space exploring human beings.

space humans are silly until any individual with 2000$ ( a month of min. wages ) to throw away can put a tennis ball sized object weighing 100 grams or less in low earth orbit.
and until a profitable business requiring the expense of a human occupied space hotel-- can be privately run. on a continous basis for years without having to fund them only through public , government money, then,

the collective decision to spend billions of unrecoverable tax dollars to maintain a small group of 'right stuff' nasa human beings in outerspace is wrong
.

More news stories

Easter morning delivery for space station

Space station astronauts got a special Easter treat: a cargo ship full of supplies. The shipment arrived Sunday morning via the SpaceX company's Dragon cargo capsule.

Cosmologists weigh cosmic filaments and voids

(Phys.org) —Cosmologists have established that much of the stuff of the universe is made of dark matter, a mysterious, invisible substance that can't be directly detected but which exerts a gravitational ...

Finnish inventor rethinks design of the axe

(Phys.org) —Finnish inventor Heikki Kärnä is the man behind the Vipukirves Leveraxe, which is a precision tool for splitting firewood. He designed the tool to make the job easier and more efficient, with ...