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Related Experiment Videos

Solar wind origin in coronal funnels.

Chuan-Yi Tu1, Cheng Zhou, Eckart Marsch

  • 1Department of Geophysics, Peking University, Beijing 100871, China. cytu@public3.bta.net.cn

Science (New York, N.Y.)
|April 23, 2005
PubMed
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The solar wind originates from solar coronal holes, starting its outflow between 5 and 20 megameters above the photosphere within magnetic funnels. This finding clarifies the solar wind

Area of Science:

  • * Solar Physics
  • * Plasma Physics
  • * Astrophysics

Background:

  • * The precise origin of the solar wind within solar coronal holes remains a long-standing puzzle in solar physics.
  • * Understanding the solar wind's source is crucial for space weather prediction and understanding coronal dynamics.

Purpose of the Study:

  • * To pinpoint the specific altitudes and mechanisms responsible for the initiation of the solar wind outflow from the Sun's corona.
  • * To correlate ion behavior and magnetic field structures to determine the solar wind's starting point.

Main Methods:

  • * Correlating Doppler-velocity and radiance maps of spectral lines from various ions (Ne7+, C3+).
  • * Extrapolating force-free magnetic fields from photospheric magnetograms to different altitudes.

Related Experiment Videos

  • * Analyzing ion emission heights and outflow speeds in relation to magnetic funnels.

    • Main Results:

    • * Solar wind outflow initiates between 5 and 20 megameters above the photosphere within magnetic funnels.
    • * Ne7+ ions radiate around 20 megameters with outflow speeds of ~10 km/s.
    • * C3+ ions primarily radiate around 5 megameters with no significant average flow speed.

    Conclusions:

    • * The solar wind originates at specific altitudes within magnetic funnels in the solar corona.
    • * The observed ion behavior supports a model where the solar wind begins its outward journey in these structures.
    • * A new model for solar wind origin is proposed based on these findings.