sun

01/22/2014 - 18:10

Decreases in the Fe/O ratio during solar energetic particle (SEP) event onsets are often observed and attributed to a variety of processes such as the acceleration mechanism, shock geometry, mixtures of particle populations, and interplanetary transport.

 

10/21/2013 - 10:46

Attention-deficit/hyperactivity disorder, or ADHD, is the most common childhood psychiatric disorder. Scientists do not know what causes it, but genetics play a clear role. Other risk factors have also been identified, including premature birth, low birth weight, a mother's use of alcohol or tobacco during pregnancy, and environmental exposures to toxins like lead.

 

09/27/2013 - 15:54

Three months after the flight of the solar observatory Sunrise – carried aloft by a NASA scientific balloon in early June 2013 -- scientists from the Max Planck Institute for Solar System Research in Germany have presented unique insights into a layer on the sun called the chromosphere. Sunrise provided the highest-resolution images to date in ultraviolet light of this thin corrugated layer, which lies between the sun's visible surface and the sun's outer atmosphere, the corona.

 

08/28/2013 - 14:28

The three types of solar wind — coronal-hole-associated fast and cold wind, streamer-associated slow and hot wind, and interplanetary coronal mass ejections (ICMEs) — have been differentiated by their composition and studied using ACE/SWICS observations from 1998 to 2005 (Zhao et al. GRL 2009 and ACE News #106). To continue this earlier study and to complete the picture of the near-Earth solar wind structure during the whole solar cycle, we extend this investigation to June 2011, covering the unusual solar minimum between solar cycles 23 and 24 (2007-2010) and the beginning years of solar cycle 24.

 

07/31/2013 - 10:55

With the help of asteroseismic data obtained by the CoRoT space telescope, scientists were able to determine the interior rotation of a Sun-like star – and characterise an exoplanet. Their calculations show that the star rotates about 2.3 times faster than the Sun, with the axis of rotation inclined at 30 degrees to our line of sight. The star, HD52265, is located more than 90 light years away in the constellation of Monoceros.

 

07/08/2013 - 11:51

A normally staid University of Chicago scientist has stunned many of his colleagues with his radical solution to a 135-year-old mystery in cosmochemistry. As a cosmochemist, the University of Chicago’s Lawrence Grossman reconstructs the sequence of minerals that condensed from the solar nebula, the primordial gas cloud that eventually formed the sun and planets.