Quantcast
Last updated on April 16, 2014 at 11:09 EDT

Latest Robert Cahalan Stories

1c7d169b61f0ce075e2545b163e85fb31
2010-12-17 08:16:09

Two satellite instruments aboard NASA's Solar Radiation & Climate Experiment (SORCE) mission -- the Total Solar Irradiance Monitor (TIM) and the Solar Irradiance Monitor (SIM) -- have made daily measurements of the sun's brightness since 2003. The two instruments are part of an ongoing effort to monitor variations in solar output that could affect Earth's climate. Both instruments measure aspects of the sun's irradiance, the intensity of the radiation striking the top of the atmosphere....

2008-07-04 21:00:05

BELTSVILLE, Md. _ NASA plans to launch a new satellite next year that will help scientists fill in a gap in their understanding of global warming: the role of clouds and airborne particles. The satellite Glory, targeted for launch next June, will give scientists a much better tool to measure particles than any satellite so far. The particles, known as aerosols, are bits of things such as dust and smog. "Undoubtedly, greenhouse gases cause the biggest climatic effect. But the uncertainty in...

f479b34fc33953942669c75b4c37bc0b
2008-05-08 00:20:00

The sun has powered almost everything on Earth since life began, including its climate. The sun also delivers an annual and seasonal impact, changing the character of each hemisphere as Earth's orientation shifts through the year. Since the Industrial Revolution, however, new forces have begun to exert significant influence on Earth's climate. "For the last 20 to 30 years, we believe greenhouse gases have been the dominant influence on recent climate change," said Robert Cahalan,...