Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...610..572g&link_type=abstract
The Astrophysical Journal, Volume 610, Issue 1, pp. 572-587.
Astronomy and Astrophysics
Astronomy
21
Sun: Chromosphere, Waves
Scientific paper
Although ``Moreton'' waves have historically been observed in Hα data, more recently waves have also been observed in chromospheric He I (λ=10830 Å) images. In a previous study, we found that chromospheric waves observed in He I data (from the Mauna Loa Solar Observatory) in two events (occurring on 2000 November 25 and 2001 January 20) are cospatial with the corresponding coronal waves observed by EIT (Fe XII λ=195 Å). In an effort to better understand the nature of chromospheric waves, we focus on these two wave events observed in He I in which two interesting phenomena occur: the waves are visible in the He I velocity data, and multiple waves are observed for each event. We suggest that the velocity signal is a result of slow-mode wave compression followed by a slow-mode wave rarefaction propagating downward from the corona into the upper chromosphere. We also suggest that the observed multiple waves indicate that more than one driving mechanism may be involved.
Gilbert Holly R.
Holzer Thomas Edward
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