solar observations 2 j. todd hoeksema stanford university

16
Solar Observations 2 J. Todd Hoeksema Stanford University

Post on 15-Jan-2016

217 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Solar Observations 2 J. Todd Hoeksema Stanford University

Solar Observations 2

J. Todd Hoeksema

Stanford University

Page 2: Solar Observations 2 J. Todd Hoeksema Stanford University

SOHO/MDI Magnetic RotationMay 1998

Page 3: Solar Observations 2 J. Todd Hoeksema Stanford University

Three-Temperature Solar Rotation

Page 4: Solar Observations 2 J. Todd Hoeksema Stanford University

Solar X-Ray Cycle

Page 5: Solar Observations 2 J. Todd Hoeksema Stanford University

Stellar Cycles

Page 6: Solar Observations 2 J. Todd Hoeksema Stanford University

Hinode G-Band Image of Stellar Surface

Page 7: Solar Observations 2 J. Todd Hoeksema Stanford University

Flare Helioseismology

SoundsOf Modes

Page 8: Solar Observations 2 J. Todd Hoeksema Stanford University

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

Page 9: Solar Observations 2 J. Todd Hoeksema Stanford University

Hinode Trilobite - Still

Page 10: Solar Observations 2 J. Todd Hoeksema Stanford University

Hinode Stellar Atmosphere - Still

Page 11: Solar Observations 2 J. Todd Hoeksema Stanford University

Star Spots

Multi-color observations of Star Spots

Page 12: Solar Observations 2 J. Todd Hoeksema Stanford University

Multi-Instrument SOHO Sun

Page 13: Solar Observations 2 J. Todd Hoeksema Stanford University

SOHO 10th Anniversary Spectacular

Page 14: Solar Observations 2 J. Todd Hoeksema Stanford University

Comet Tail Disruption

Page 15: Solar Observations 2 J. Todd Hoeksema Stanford University

Comets in the Solar Wind

Page 16: Solar Observations 2 J. Todd Hoeksema Stanford University

Solar Observations 2

J. Todd Hoeksema

Stanford University