Sun & Space Weather

June 06, 2011
The solar minimum that bottomed out from 2006 to 2010 was the longest and deepest since modern space observations began. Among other effects, it reorganized the areas of flux from open magnetic field lines that produce solar wind. NCAR postdoctoral researcher Liang Zhao is using data from the last two minima to revise a model of how open magnetic flux is transported through the solar atmosphere.
April 06, 2011
An international team of astronomers that includes NCAR’s Savita Mathur has observed mixed waves—a mixture of acoustic and gravity waves—that run all the way to the cores of red giant stars. Astronomers already knew that such waves (known as stellar oscillations) existed, but until now had only observed pure acoustic waves traveling through the outer parts of stars.
A close-up of the solar limb
March 11, 2011
One of the most enduring mysteries in solar physics is why the Sun’s outer atmosphere, or corona, is millions of degrees hotter than its surface. Now scientists believe they have discovered a major source of hot gas that replenishes the corona.
February 22, 2011
A new study from NCAR uses an innovative computer model to investigate events called sudden stratospheric warmings (SSWs) in the Arctic atmosphere. The study focuses on how two atmospheric patterns based in the tropics, the El Niño–Southern Oscillation and Quasi-Biennial Oscillation, affect SSWs.
satellite image of area on solar disk with spicules emerging from the surface
January 06, 2011
Structures called spicules may explain why the Sun’s corona is much hotter than its surface, according to a new paper in Science.
Savita
November 04, 2010
In a bid to unlock longstanding mysteries of the Sun, including the impacts on Earth of its 11-year cycle, a team of scientists from NCAR, France, and Spain has successfully probed a distant star.
Image of a satellite pointed at star
August 26, 2010
Scientists have detected "starspots," on the surface of a star using stellar seismology. The technique offers the potential to examine hundreds of stars.
August 26, 2010
The new research has implications for satellite orbits.
August 12, 2010
Results from a new study should help scientists better understand the factors controlling the timing of solar cycles and could lead to better predictions.
Alice Lecinski, Phil Judge, and Don Kolinski
June 10, 2010
Between 1969 and 1971, NCAR scientist John Eddy set out to archive an important part of the history of both photography and astronomy. Eddy collected more than 100 pictures of total solar eclipses taken from the late 1800s into the mid-1900s.

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The University Corporation for Atmospheric Research manages the National Center for Atmospheric Research under sponsorship by the National Science Foundation. Any opinions, findings and conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

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