space news from around the webin association with SpaceNews

Scientists peer into heart of sunspot
Posted: Wed, Nov 7, 2001, 4:07 PM ET (2107 GMT)
Sunspot structure diagram from SOHO data (NASA) Solar scientists said Tuesday that they now have a better understanding of the structure of sunspots and how they stay together, thanks to data from the ESA/NASA Solar and Heliospheric Observatory (SOHO) spacecraft. Data from a SOHO instrument allowed scientists to probe the region below the surface of a sunspot, giving an unprecedented view of the structure of these features. Sunspots form in regions where the Sun's magnetic field becomes concentrated; the field pinches off the flow of energy from lower regions, causing the surface to cool and darken. Scientists found that as the plasma on surface cools, it becomes denser and eventually falls at speeds of up to 5,000 km/h. This draws in surrounding plasma, which also cools and falls, setting up a cycle that persists as long as the magnetic field in the region is strong. The SOHO observations also showed that sunspots are relatively shallow, extending no more than about 5,000 km below the photosphere, or visible surface of the Sun.
<<previous article   next article>>
news in brief
Union accepts contract to end ULA strike
Posted: Sun, May 20 1:41 PM ET (1741 GMT)

Contamination found in SLS core stage tubing
Posted: Sun, May 20 1:40 PM ET (1740 GMT)

Appropriators pass NASA spending bill that funds WFIRST
Posted: Sun, May 20 1:39 PM ET (1739 GMT)

news links
Wednesday, May 23
NASA, Iridium carpooled on Tuesday’s SpaceX mission
Los Angeles Business Journal — 6:01 am ET (1001 GMT)

about   ·   ·   mailing list