Latest Reuven Ramaty High Energy Solar Spectroscopic Imager Stories

Venus Transit Will Help RHESSI Improve Sun Measurements
2012-06-05 08:42:08

The RHESSI (Ramaty High Energy Solar Spectroscopic Imager) satellite focuses on the highest energy x-rays and gamma-rays produced by the sun, helping to observe solar flares of all shapes and sizes. The satellite is pointed toward the sun, and constantly in rotation, which provides a serendipitous bit of side research: by monitoring the limb of the sun on its four second rotation cycle, RHESSI´s Solar Aspect System (SAS) has produced ten years worth of precise measurements of the sun's...

RHESSI Mission Celebrates Ten Years And Forty Thousand X-Ray Flares
2012-02-11 04:00:56

[ Watch the Video ] On February 5, 2002, NASA launched what was then called the High Energy Solar Spectroscopic Imager (HESSI) into orbit. Renamed within months as the Ramaty High Energy Solar Spectroscopic Imager (RHESSI) after Reuven Ramaty, a deceased NASA scientist who had long championed the mission, the spacecraft's job was to observe giant explosions on the sun called solar flares. During a solar flare, the gas soars to over 20 million degrees Fahrenheit, and emits X-rays that...

Firestation In Space To Open Firehose Of Lightning Data
2011-10-18 09:49:22

When opportunity knocked, NASA heliophysicist Doug Rowland answered. He and his team recently secured another flight opportunity for a pint-sized instrument studying lightning in Earth's upper atmosphere and now are bracing for a veritable "fire hose" of data about a little-understood phenomenon first discovered by scientists nearly two decades ago. The instrument, Firestation, is one of four experiments manifested to fly on an experiment pallet the U.S. Department of Defense plans to...

2010-02-11 07:20:00

Instruments scanning outer space for cataclysmic explosions called gamma-ray bursts are detecting intense flashes of gamma-ray energy right here in the friendly skies of Earth. These terrestrial gamma-ray flashes, or TGFs, blast through thunderstorms close to the altitude where commercial airliners fly. In fact, they could be too close for comfort. In a recent study,* scientists estimated that airline passengers could be exposed to 400 chest X-rays worth of radiation by being near the origin...

2009-08-28 14:25:00

In 1959, only two years after the Soviet Union launched Sputnik and ignited the space race, the University of California, Berkeley, created a laboratory devoted to space science that has grown to be one of the most active academic space research labs in the country.Now celebrating its 50th anniversary, UC Berkeley's Space Sciences Laboratory (SSL) has provided instruments for 75 satellites, two dozen rockets, nearly 200 balloon flights and numerous ground-based experiments. Eight of the...

2008-10-02 15:25:00

Scientists using NASA's RHESSI spacecraft have measured the roundness of the sun with unprecedented precision. They find that it is not a perfect sphere. During years of high solar activity the sun develops a thin "cantaloupe skin" that significantly increases its apparent oblateness: the sun's equatorial radius becomes slightly larger than its polar radius. Their results appear the Oct. 2nd edition of Science Express. "The sun is the biggest and therefore smoothest object in the solar...

2008-04-02 09:25:00

A plethora of latest results from the Hinode solar observatory contains a wealth of new discoveries. This includes the discovery of a source of the slow solar wind and the observation of a superhot micro flare.Source of the slow solar windAn international team of scientists, led by Prof. Louise Harra, University College London, Mullard Space Science Laboratory, has found a source of the stream of particles that make up the slow solar wind using data from Hinode and SOHO. The solar wind can...

2005-05-24 12:23:49

NASA -- The most intense burst of solar radiation in five decades accompanied a large solar flare on January 20. It shook space weather theory and highlighted the need for new forecasting techniques, according to several presentations at the American Geophysical Union (AGU) meeting this week in New Orleans. The solar flare, which occurred at 2 a.m. EST, tripped radiation monitors all over the planet and scrambled detectors on spacecraft. The shower of energetic protons came minutes after the...

2005-02-18 06:35:00

NASA -- A great mystery was set in motion a few years ago when a spacecraft designed to measure gamma-ray bursts -- the most powerful explosions in the Universe -- found that Earth was actually emitting some flashes of its own. Named Terrestrial gamma-ray flashes (TGFs), these very short blasts of gamma rays lasting about one millisecond, are emitted into space from Earth's upper atmosphere. Scientists believe electrons traveling at nearly the speed of light scatter off of atoms and...

Word of the Day
  • To talk saucily.
  • Insolent, opprobrious language; impertinent abuse.
This word is Scots in origin and probably imitative.