An innovative solar observing satellite, Hinode, has successfully observed the detailed evolution of an emerging magnetic field, starting from its appearance at the solar surface, to forming a developed bipolar region. The high spatial and temporal resolutions provided by the satellite has enabled us to capture prominent dynamic phenomena caused by the emerging magnetic field, such as a running wave in a chromospheric layer and the rotation of a magnetic polarity region on the Sun, which is reminiscent of a cyclone on Earth. A possible mechanism for producing the chromospheric running wave spreading from a solar cyclone has been demonstrated with a three-dimensional magnetohydrodynamic simulation for the emergence of a twisted flux tube. The simulation shows that as the emergence proceeds, an arc-shaped region with enhanced plasma density propagates outwards from the site of emergence.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- Sun: atmospheric motions
- Sun: chromosphere