Publication detail

Structure and Dynamics of the 2009 July 22 Eclipse White-light Corona

PASACHOFF, J. RUŠIN, V. SANIGA, M. DRUCKMÜLLEROVÁ, H. BABCOCK, B.

Original Title

Structure and Dynamics of the 2009 July 22 Eclipse White-light Corona

Type

journal article in Web of Science

Language

English

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.

Keywords

Key words: eclipses – Sun: chromosphere – Sun: corona – Sun: coronal mass ejections (CMEs) – Sun: magnetic topology – Sun: UV radiation

Authors

PASACHOFF, J.; RUŠIN, V.; SANIGA, M.; DRUCKMÜLLEROVÁ, H.; BABCOCK, B.

RIV year

2011

Released

20. 11. 2011

Publisher

IOP Publishing

Location

Bristol, Velká Británie

ISBN

0004-637X

Periodical

ASTROPHYSICAL JOURNAL

Year of study

742

Number

1

State

United States of America

Pages from

29

Pages to

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",
  journal="ASTROPHYSICAL JOURNAL",
  year="2011",
  volume="742",
  number="1",
  pages="29--41",
  issn="0004-637X"
}