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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…
Polar Coronal Holes During Solar Cycles 22 and 23
Woch, J.; Zhang, Jun; Solanki, S.
Data from the Solar Wind Ion Composition Spectrometer (SWICS) on Ulysses and synoptic maps from Kitt Peak are used to analyze the polar coronal holes of solar activity cycles 22 and 23 (from 1990 to end of 2003). In the beginning of the declining phase of solar cycles 22 and 23, the north polar coronal holes (PCHs) appear about one year earlier th…
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 …