Christopher Allen
A Brief History Of Radio – Echo Sounding Of Ice
The application of radio-echo sounding (RES) to thickness measurements of glacial and sheet ice has been demonstrated since the early 1960s. The concept for this approach can be traced to 1933 at Admiral Byrd’s base, Little America, Antarctica where the first indication that snow and ice are transparent to high frequency radio signal was observed.
Christopher Allen, posted on
September 26th, 2008
Articles, Earth Observation, Featured Article, Technology
NASA Daily Image
Large X-class Flare Erupts on the Sun
On Jan. 27, 2012, a large X-class flare erupted from an active region near the solar west limb. X-class flares are the most powerful of all solar events. Seen here is an image of the flare captured by the X-ray telescope on Hinode. This image shows an emission from plasma heated to greater than eight million degrees during the energy release process of the flare. Image Credit: JAXA/Hinode