Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...742...29p&link_type=abstract
The Astrophysical Journal, Volume 742, Issue 1, article id. 29 (2011).
Astronomy and Astrophysics
Astronomy
Eclipses, Sun: Chromosphere, Sun: Corona, Sun: Coronal Mass Ejections: Cmes, Sun: Magnetic Topology, Sun: Uv Radiation
Scientific paper
The white-light corona (WLC) during the total solar eclipse of 2009 July 22 was observed by several teams in the Moon's shadow stretching from India and China across the Pacific Ocean with its many isolated islands. We present a comparison of the WLC as observed by eclipse teams located in China (Shanghai region) and on the Enewetak Atoll in the Marshall Islands, with observations taken 112 minutes apart, combined with near-simultaneous space observations. The eclipse was observed at the beginning of solar cycle 24, during a deep solar minimum (officially estimated as 2008 December according to the smoothed sunspot number, but very extended). The solar corona shows several different types of features (coronal holes, polar rays, helmet streamers, faint loops, voids, etc.), though it was extremely sparse in streamers as shown from Large-Angle Spectroscopic Coronagraph data. No large-scale dynamical phenomena were seen when comparing the observations from the two sites, confirming that the corona was quiescent. We measure a Ludendorff flattening coefficient of 0.238, typical of solar minimum.
Babcock Bryce A.
Druckmüllerová Hana
Pasachoff Jay. M.
Rusin Vojtech
Saniga Metod
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