Upward Propagating Alfvén Wave and its Connection With Magnetic Reconnection in the Chromosphere as Observed by SOT

Details Upward Propagating Alfvén Wave and its Connection With Magnetic Reconnection in the Chromosphere as Observed by SOT Upward Propagating Alfvén Wave and its Connection With Magnetic Reconnection in the Chromosphere as Observed by SOT

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsh31b..02t&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SH31B-02

Physics

2169 Solar Wind Sources, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

We identify high-frequency Alfvén waves propagating upward in the solar chromosphere and transition region from observational data obtained by the Solar Optical Telescope (SOT) onboard Hinode. We find that in four cases the spicules are modulated by high-frequency (>0.02~Hz) transverse fluctuations, which are inferred to be associated with Alfvén waves. They apparently propagate upward along the spicules with phase speeds ranging from 50 to 150~km/s. Three of these modulated spicules show clear wave-like shapes, with short wavelengths being less than 8~Mm. In our analysis we thus identified directly upward propagation of Alfvén waves in the solar chromosphere and transition region. In addition to the recently reported Alfvén waves with very long wavelengths and wave periods, we find here four examples of Alfvén waves with shorter wavelengths and periods. Moreover, we report observational evidence for Alfvén-wave excitation due to magnetic reconnection. These findings shed new light on the wave origin and on the coronal and solar-wind heating by waves.

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