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Solar Observations 2

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Solar Observations 2 J. Todd Hoeksema Stanford University SOHO/MDI Magnetic Rotation May 1998 Three-Temperature Solar Rotation Solar X-Ray Cycle Stellar Cycles Hinode ... – PowerPoint PPT presentation

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Title: Solar Observations 2


1
Solar Observations 2
  • J. Todd Hoeksema
  • Stanford University

2
SOHO/MDI Magnetic RotationMay 1998
3
Three-Temperature Solar Rotation
4
Solar X-Ray Cycle
5
Stellar Cycles
6
Hinode G-Band Image of Stellar Surface
7
Flare Helioseismology
Sounds Of Modes
8
  • SOLAR SCIENCE - Nov 07, 2006
  • Monster Stellar Flare Dwarfs All Others
  • Scientists using NASA's Swift satellite have
    spotted a stellar flare on a nearby star so
    powerful that, had it been from our sun, it would
    have triggered a mass extinction on Earth. The
    flare was perhaps the most energetic magnetic
    stellar explosion ever detected. The flare was
    seen in December 2005 on a star slightly less
    massive than the sun, in a two-star system called
    II Pegasi in the constellation Pegasus.
  • It was about a hundred million times more
    energetic than the sun's typical solar flare,
    releasing energy equivalent to about 50 million
    trillion atomic bombs.
  • Fortunately, our sun is now a stable star that
    doesn't produce such powerful flares. And II
    Pegasi is at a safe distance of about 135
    light-years from Earth.
  • Yet in detecting this brilliant flare, scientists
    obtained direct observational evidence that
    stellar flares on other stars involve particle
    acceleration, just like on our sun. Rachel Osten
    of University of Maryland and NASA Goddard Space
    Flight Center in Greenbelt, Md., presents this
    finding today at the Cool Stars 14 meeting in
    Pasadena, Calif.,,,,

This is a real image of a typical solar flare
from our sun, from September 2005, captured in
the X-ray waveband by NASA's TRACE satellite.
Note the bright magnetic loops of matter. The
twisting and reconnecting of these loops initiate
the flare. NASA's Swift satellite detected a
similar flare from a star system called II Pegasi
135 light-years from Earth... except it was one
hundred million times more energetic than the
sun's typical solar flare. Had it been from our
sun, it would have triggered a mass extinction on
Earth. The II Pegasi flare was too distant
(fortunately) to image in detail. Credit
NASA/LMSAL
9
Hinode Trilobite - Still
10
Hinode Stellar Atmosphere - Still
11
Star Spots
  • Multi-color observations of Star Spots

12
Multi-Instrument SOHO Sun
13
SOHO 10th Anniversary Spectacular
14
Comet Tail Disruption
15
Comets in the Solar Wind
16
Solar Observations 2
  • J. Todd Hoeksema
  • Stanford University
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