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Formation of Transient Coronal Holes during the Eruption of a Quiescent Filament and its Overlying Sigmoid
Yang, Li-Heng; Jiang, Yun-Chun; Ren, Dong-Bai
By using Hα, He I 10830, EUV and soft X-ray (SXR) data, we examined a filament eruption that occurred on a quiet-sun region near the center of the solar disk on 2006 January 12, which disturbed a sigmoid overlying the filament channel observed by the GOES-12 SXR Imager (SXI), and led to the eruption of the sigmoid. The event was associated with a …
Speed Distributions of CMEs in Cycle 23 at Low and High Latitudes
Gao, Peng-Xin; Li, Ke-Jun
We analyzed the speed (v) distributions of 11584 coronal mass ejections (CMEs) observed by the Large Angle and Spectrometric Coronagraph Experiment on board the Solar and Heliospheric Observatory (SOHO/LASCO) in cycle 23 from 1996 to 2006. We find that the speed distributions for high-latitude (HL) and low-latitude (LL) CME events are nearly ident…
Magnetic Properties of Metric Noise Storms Associated with Coronal Mass Ejections
Wang, Jing-Xiu; Wen, Ya-Yuan; Zhang, Yu-Zong
Using Nançay Radioheliograph (NRH) imaging observations, combined with SOHO/Michelson Doppler Imager (MDI) magnetogram observations and coronal magnetic field extrapolation, we studied the magnetic nature of metric noise storms that are associated with coronal mass ejections (CMEs). Four events are selected: the events of 2000 July 14, 2001 April …
Observational Features of Large-Scale Structures as Revealed by the Catastrophe Model of Solar Eruptions
Lin, Jun
Large-scale magnetic structures are the main carrier of major eruptions in the solar atmosphere. These structures are rooted in the photosphere and are driven by the unceasing motion of the photospheric material through a series of equilibrium configurations. The motion brings energy into the coronal magnetic field until the system ceases to be in…
Two Sympathetic Homologous CMEs on 2002 May 22
Ding, Ming-De; Fang, Cheng; Cheng, Jian-Xia +1 more
Sympathetic coronal mass ejections (CMEs) usually occur in different active regions connected by interconnecting magnetic loops, while homologous CMEs occur within the same active region with an almost the same background magnetic field, and so are similar in shapes. Two sympathetic CMEs erupted within 3 hours on 2002 May 22, originating from the …
Latitudinal Distribution of Solar Flares and Their Association with Coronal Mass Ejections
Shrivastava, Pankaj K.; Singh, Neelam
Major solar flare events have been utilised to study the latitudinal frequency distribution of solar flares in northern and southern hemispheres for the period of 1986 to 2003. A statistical analysis has been performed to obtain the correlation between Coronal Mass Ejections (CMEs) and Forbush decrease (Fds) of cosmic ray intensity. Almost the sam…
Resonant Heating of Ions by Parallel Propagating Alfvén Waves in Solar Coronal Holes
Xiao, Chi-Jie; Wang, Jing-Xiu; Zhang, Tian-Xi
Resonant heating of H, O+5, and Mg+9 by parallel propagating ion-cyclotron Alfvén waves in solar coronal holes at a heliocentric distance is studied using the heating rate derived from the quasilinear theory. It is shown that the particle-Alfvén-wave interaction is a significant microscopic process. The temperatures of the io…
Waiting Time Distribution of Coronal Mass Ejections
Ding, Ming-De; Chen, Peng-Fei; Yeh, Chin-Teh
Inspired by the finding that the large waiting time of solar flares presents a power-law distribution, we investigate the waiting time distribution (WTD) of coronal mass ejections (CMEs). SOHO/LASCO CME observations from 1996 to 2003 are used in this study. It is shown that the observed CMEs have a similar power-law behavior to the flares, with an…
Chromospheric Internetwork Oscillations at Various Locations of the Quiet Sun
Ning, Zong-Jun; Ming-DeDing
We analyze oscillation behaviours in chromospheric internetwork regions using spectral observations of the CII 1334 Å line obtained with the Solar Ultraviolet Measurements of Emitted Radiation spectrograph (SUMER) aboard Solar and Heliospheric Observatory (SOHO). Three areas, 26×120arcsec2 each, at the various latitudes from …
Three Super Active Regions in the Descending Phase of Solar Cycle 23
Guo, Juan; Chen, Jie; Zhang, Yin +12 more
We analyze the magnetic configurations of three super active regions, NOAA 10484, 10486 and 10488, observed by the Huairou Multi-Channel Solar Telescope (MCST) from 2003 October 18 to November 4. Many energetic phenomena, such as flares (including a X-28 flare) and coronal mass ejections (CMEs), occurred during this period. We think that strong sh…