A STATISTICAL STUDY OF THE RELATIONSHIP BETWEEN THE TRANSPORT RATE OF MAGNETIC HELICITY AND SOLAR FLARES

被引:6
|
作者
Zhang, Yin [1 ]
Tan, Baolin [1 ]
Yan, Yihua [1 ]
机构
[1] Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
来源
ASTROPHYSICAL JOURNAL | 2009年 / 704卷 / 02期
关键词
Sun: activity; Sun: flares; Sun: magnetic fields; CORONAL MASS EJECTIONS; HORIZONTAL MOTION; FIELD; SPECTROMETER; SURFACE; REGION; SIGN; LINE;
D O I
10.1088/0004-637X/704/2/1622
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a statistical study which is aimed at understanding the fact that some flares (type I flare) are associated with sharp variations of the transport rate of magnetic helicity (dH/dt) while others are not (type II flare). The sample consists of 49 M-class and X-class flares which were produced by nine isolated active regions. Using high temporal magnetograms obtained by the Michelson Doppler Imager instrument on the Solar and Heliospheric Observatory, we calculate the temporal variation of dH/dt during the flaring time, and compare its profile with the soft X-ray flux. We find that type I flares have longer duration and higher peak flux in soft X-ray than type II flares. Furthermore, the ratio of the total unsigned magnetic flux of the host active region to that of the visible solar disk is also higher for type I flares, while the total flux itself is independent of the flare type. Our results show that whether the flare is associated with sharp variations of dH/dt depends on the properties of the flare and of its host active region. The relationship between dH/dt and microwave bursts is also discussed.
引用
收藏
页码:1622 / 1627
页数:6
相关论文
共 50 条
  • [1] Study of the relationship between magnetic helicity and solar coronal activity
    Kusano, K
    CORONAL AND STELLAR MASS EJECTIONS, 2005, (226): : 256 - 256
  • [2] A statistical study of the reconnection rate in solar flares
    Nagashima, Kaori
    Yokoyama, Takaaki
    NEW SOLAR PHYSICS WITH SOLAR-B MISSION, 2007, 369 : 429 - +
  • [3] Statistical study of the reconnection rate in solar flares
    Isobe, H
    Morimoto, T
    Eto, S
    Narukage, N
    Shibata, K
    MULTI-WAVELENGTH OBSERVATIONS OF CORONAL STRUCTURE AND DYNAMICS, 2002, 13 : 171 - 172
  • [4] The role. of magnetic helicity in solar flares
    Linton, Mark G.
    HIGHLIGHTS OF ASTRONOMY, VOL 13, 2005, 13 : 128 - 131
  • [5] Correlation between the sharp variation of the transport rate of magnetic helicity and solar eruptive events
    Zhang, Yin
    Tan, Baolin
    Yan, Yihua
    ASTROPHYSICAL JOURNAL LETTERS, 2008, 682 (02) : L133 - L136
  • [6] Statistical relationship between solar flares and coronal mass ejections
    Yashiro, Seiji
    Gopalswamy, Nat
    UNIVERSAL HELIOPHYSICAL PROCESSES, 2009, (257): : 233 - 243
  • [7] The Relationship between Kinetic and Magnetic Helicity in Solar Active Regions
    Liu, Yang
    Komm, Rudolf
    Brummell, Nicholas H.
    Hoeksema, J. Todd
    Manek, Bhishek
    Valori, Gherardo
    ASTROPHYSICAL JOURNAL, 2024, 971 (01):
  • [8] Investigating the Statistical Relationship between Coronal Mass Ejections and Solar Flares
    Barkhatov N.A.
    Vorobjev V.G.
    Revunov S.E.
    Revunova E.A.
    Bulletin of the Russian Academy of Sciences: Physics, 2021, 85 (03) : 234 - 237
  • [9] Statistical relationship between the succeeding solar flares detected by the RHESSI satellite
    Balazs, L. G.
    Gyenge, N.
    Korsos, M. B.
    Baranyi, T.
    Forgacs-Dajka, E.
    Ballai, I.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 441 (02) : 1157 - 1165
  • [10] The relationship between magnetic helicity and current helicity
    Liu, JH
    Zhang, Y
    Zhang, HQ
    CORONAL AND STELLAR MASS EJECTIONS, 2005, (226): : 227 - 228