Long-Period Chromospheric Oscillations in Network Bright Points

Details Long-Period Chromospheric Oscillations in Network Bright Points Long-Period Chromospheric Oscillations in Network Bright Points

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...567l.165m&link_type=abstract

The Astrophysical Journal, Volume 567, Issue 2, pp. L165-L168.

Astronomy and Astrophysics

Astronomy

22

Sun: Chromosphere, Sun: Magnetic Fields, Sun: Oscillations, Sun: Photosphere

Scientific paper

The spatial variation of chromospheric oscillations in network bright points (NBPs) is studied using high-resolution observations in Ca II K3. Light curves and hence power spectra were created by isolating distinct regions of the NBP via a simple intensity thresholding technique. Using this technique, it was possible to identify peaks in the power spectra with particular spatial positions within the NBPs. In particular, long-period waves with periods of 4-15 minutes (1-4 mHz) were found in the central portions of each NBP, indicating that these waves are certainly not acoustic but possibly due to magnetoacoustic or magnetogravity wave modes. We also show that spatially averaged or low spatial resolution power spectra can lead to an inability to detect such long-period waves.

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