High-resolution observations of multiwavelength emissions during two X-class white-light flares

Yan Xu; Wenda Cao; Chang Liu; Guo Yang; Ju Jing; Carsten Denker; A. Gordon Emslie; Haimin Wang

doi:10.1086/500632

High-resolution observations of multiwavelength emissions during two X-class white-light flares

Yan Xu, Wenda Cao, Chang Liu, Guo Yang, Ju Jing, Carsten Denker, A. Gordon Emslie, Haimin Wang

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

We observed two X-class white-light flares (WLFs) on 2003 October 29 (∼20:40 UT) and November 2 (∼17:16 UT) using the Dunn Solar Telescope (DST) and its High-Order Adaptive Optics (HOAO) system in several wavelengths. The spatial resolution was close to the diffraction limit of DST's 76 cm aperture, and the cadence was as high as 2 s. This is the first time that WLFs have been observed in the near-infrared (NIR) wavelength region. We present a detailed study in this paper comparing photospheric continuum observations during the two events with corresponding line-of-sight magnetograms from the Solar and Heliospheric Observatory (SOHO) Michelson Doppler Imager (MDI) and hard X-ray (HXR) data from the Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). We also discuss several models that provide possible mechanisms to explain these continuum enhancements, especially in the NIR.

Original language	English (US)
Pages (from-to)	1210-1216
Number of pages	7
Journal	Astrophysical Journal
Volume	641
Issue number	2 I
DOIs	https://doi.org/10.1086/500632
State	Published - Apr 20 2006

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Sun: activity
Sun: flares
Sun: photosphere

Access to Document

10.1086/500632

Cite this

@article{16466caee3584909808c74e0e4983a79,

title = "High-resolution observations of multiwavelength emissions during two X-class white-light flares",

abstract = "We observed two X-class white-light flares (WLFs) on 2003 October 29 (∼20:40 UT) and November 2 (∼17:16 UT) using the Dunn Solar Telescope (DST) and its High-Order Adaptive Optics (HOAO) system in several wavelengths. The spatial resolution was close to the diffraction limit of DST's 76 cm aperture, and the cadence was as high as 2 s. This is the first time that WLFs have been observed in the near-infrared (NIR) wavelength region. We present a detailed study in this paper comparing photospheric continuum observations during the two events with corresponding line-of-sight magnetograms from the Solar and Heliospheric Observatory (SOHO) Michelson Doppler Imager (MDI) and hard X-ray (HXR) data from the Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). We also discuss several models that provide possible mechanisms to explain these continuum enhancements, especially in the NIR.",

keywords = "Sun: activity, Sun: flares, Sun: photosphere",

author = "Yan Xu and Wenda Cao and Chang Liu and Guo Yang and Ju Jing and Carsten Denker and Emslie, {A. Gordon} and Haimin Wang",

year = "2006",

month = apr,

day = "20",

doi = "10.1086/500632",

language = "English (US)",

volume = "641",

pages = "1210--1216",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2 I",

}

TY - JOUR

T1 - High-resolution observations of multiwavelength emissions during two X-class white-light flares

AU - Xu, Yan

AU - Cao, Wenda

AU - Liu, Chang

AU - Yang, Guo

AU - Jing, Ju

AU - Denker, Carsten

AU - Emslie, A. Gordon

AU - Wang, Haimin

PY - 2006/4/20

Y1 - 2006/4/20

N2 - We observed two X-class white-light flares (WLFs) on 2003 October 29 (∼20:40 UT) and November 2 (∼17:16 UT) using the Dunn Solar Telescope (DST) and its High-Order Adaptive Optics (HOAO) system in several wavelengths. The spatial resolution was close to the diffraction limit of DST's 76 cm aperture, and the cadence was as high as 2 s. This is the first time that WLFs have been observed in the near-infrared (NIR) wavelength region. We present a detailed study in this paper comparing photospheric continuum observations during the two events with corresponding line-of-sight magnetograms from the Solar and Heliospheric Observatory (SOHO) Michelson Doppler Imager (MDI) and hard X-ray (HXR) data from the Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). We also discuss several models that provide possible mechanisms to explain these continuum enhancements, especially in the NIR.

AB - We observed two X-class white-light flares (WLFs) on 2003 October 29 (∼20:40 UT) and November 2 (∼17:16 UT) using the Dunn Solar Telescope (DST) and its High-Order Adaptive Optics (HOAO) system in several wavelengths. The spatial resolution was close to the diffraction limit of DST's 76 cm aperture, and the cadence was as high as 2 s. This is the first time that WLFs have been observed in the near-infrared (NIR) wavelength region. We present a detailed study in this paper comparing photospheric continuum observations during the two events with corresponding line-of-sight magnetograms from the Solar and Heliospheric Observatory (SOHO) Michelson Doppler Imager (MDI) and hard X-ray (HXR) data from the Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). We also discuss several models that provide possible mechanisms to explain these continuum enhancements, especially in the NIR.

KW - Sun: activity

KW - Sun: flares

KW - Sun: photosphere

UR - http://www.scopus.com/inward/record.url?scp=33745325176&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745325176&partnerID=8YFLogxK

U2 - 10.1086/500632

DO - 10.1086/500632

M3 - Article

AN - SCOPUS:33745325176

SN - 0004-637X

VL - 641

SP - 1210

EP - 1216

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 I

ER -

High-resolution observations of multiwavelength emissions during two X-class white-light flares

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this