Publication detail
Structure and Dynamics of the 2009 July 22 Eclipse White-light Corona
PASACHOFF, J. RUŠIN, V. SANIGA, M. DRUCKMÜLLEROVÁ, H. BABCOCK, B.
Czech title
Structure and Dynamics of the 2009 July 22 Eclipse White-light Corona
English title
Structure and Dynamics of the 2009 July 22 Eclipse White-light Corona
Type
journal article in Web of Science
Language
en
Original abstract
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.
Czech abstract
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.
English abstract
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.
Keywords in Czech
Key words: eclipses – Sun: chromosphere – Sun: corona – Sun: coronal mass ejections (CMEs) – Sun: magnetic topology – Sun: UV radiation
Keywords in English
Key words: eclipses – Sun: chromosphere – Sun: corona – Sun: coronal mass ejections (CMEs) – Sun: magnetic topology – Sun: UV radiation
RIV year
2011
Released
20.11.2011
Publisher
IOP Publishing
Location
Bristol, Velká Británie
ISSN
0004-637X
Volume
742
Number
1
Pages from–to
29–41
Pages count
13
BIBTEX
@article{BUT75468,
author="Jay {Pasachoff} and Vojtěch {Rušin} and Metod {Saniga} and Hana {Druckmüllerová} and B. A. {Babcock},
title="Structure and Dynamics of the 2009 July 22 Eclipse White-light Corona",
year="2011",
volume="742",
number="1",
month="November",
pages="29--41",
publisher="IOP Publishing",
address="Bristol, Velká Británie",
issn="0004-637X"
}