This visualization presents several days of solar imagery in the hydrogen alpha line collected at Big Bear Solar Observatory.
With the usual focus on satellite-based solar imagery, one often forgets about the important contributions of ground-based observatories. Here we present a movie of imagery collected at Big Bear Solar Observatory (BBSO) site as part of GONG (Global Oscillations Network Group) of the National Solar Observatory (NSO). The light from the Sun is passed through a filter that admits light from the hydrogen alpha spectral line (6562.8 angstroms or 656.28 nanometers) in the red region of the spectrum. This reveals many details which cannot be seen in our usual broad-spectrum view of the Sun, particularly filaments across the solar disk and limb.
Ground-based observatories are subjected to a number of challenges different from their space-based counterparts, including gaps in the visibility of their target (i.e. nighttime), clouds (some slightly visible in this movie) and atmospheric turbulence (also some visible here).
The spectral line for hydrogen alpha is a deep red and rather dark for regular digital displays. For this visualization, we have used a brighter 'blackbody' color table to improve visibility.
This work utilizes GONG data from NSO, which is operated by AURA under a cooperative agreement with NSF and with additional financial support from NOAA, NASA, and USAF. The data was converted into images and movies at NASA's Scientific Visualization Studio.
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Data Used: NSO GONG Network/H-alpha Telescope/H-Alpha
May 13, 2013 00:00UT to May 15, 2013 14:33UT
Note: While we identify the data sets used in these visualizations, we do not store any further details nor the data sets themselves on our site.