Search Publications
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…
Results from the study of an M7.6 flare and its associated CME
Li, Hui; Li, Youping
An M7.6 flare was well observed on October 24, 2003 in active region 10486 by a few instruments and satellites, including GOES, TRACE, SOHO, RHESSI and NoRH. Multi-wavelength study shows that this flare underwent two episodes. During the first episode, only a looptop source of <40 keV was observed in reconstructed RHESSI images, which showed sh…
Coronal radio-sounding detection of a CME during the 1997 Galileo solar conjunction
Plettemeier, D.; Bird, M. K.; Efimov, A. I. +3 more
Frequency fluctuations of the Galileo S-band radio signal were recorded nearly continuously during the spacecraft’s solar conjunction from December 1996 to February 1997. A strong propagating disturbance, most probably associated with a coronal mass ejection (CME), was detected on 7 February when the radio ray path proximate point was on the west …
Rapid Cadence EUNIS-06 Observations of a He II Transient Brightening in the Quiet Sun
Brosius, Jeffrey W.; Thomas, Roger J.; Rabin, Douglas M.
We observed a transient brightening in the quiet Sun at rapid cadence (2.10 s) with the Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS-06) sounding rocket instrument on 2006 April 12. The transient was visible only in He II at 303.78 Å (T ≈ 5 × 104 K), and its maximum temperature T was <4 × 105 K. Taking its line…
Apsidal motion and photometric elements of the eccentric eclipsing binary KL CMa
Bulut, İ.
The Hipparcos and ASAS light curves of the recently discovered eccentric orbit binary KL CMa were analyzed by using the Wilson-Devinney program. The analysis of the light curves and all available minimum times have revealed that the system is detached, with the orbital eccentricity e = 0.131 ± 0.007, the rate of change of the longitude of periastr…
Chemical Abundances of the Symbiotic Nova AG Pegasi
Hyung, Siek; Kim, Hyouk
Ultra low frequency waves observed by Double Star TC-1 in the plasmasphere boundary layer
Xie, Lun; Fu, SuiYan; Zhang, XiaoJia +3 more
The characteristic and properties of ULF waves in the plasmasphere boundary layer during two very quiet periods are present. The ULF waves were detected by Double Star TC-1 when the spacecraft passed through the plasmasphere in an outbound and inbound trajectories, respectively. A clear association between the ULF waves and periodic variations of …
X-Ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups
Miller, Christopher J.; Nichol, Robert C.; Heitmann, Katrin +4 more
We present a combined optical and X-ray analysis of three optically selected X-ray-bright groups with giant elliptical galaxies in the center. These massive ellipticals were targeted for XMM-Newton X-ray observations on the basis of their large-velocity dispersions and their proximity to a nearby ROSAT X-ray source. In addition, these targets are …
Widespread Occurrence of Trenching Patterns in the Granulation Field: Evidence for Roll Convection?
Getling, A. V.; Buchnev, A. A.
Time-averaged series of granulation images are analysed using COLIBRI, a purpose-adapted version of a code originally developed to detect straight or curvilinear features in aerospace images. The image-processing algorithm utilises a nonparametric statistical criterion that identifies a straight-line segment as a linear feature (lineament) if the …
Recent progress in time distance helioseismology
Zhao, Junwei
Time distance helioseismology is one of the local helioseismology techniques that are used to derive the interior properties of the Sun. It has been used to study the structures and flow fields beneath sunspots on local scales, as well as used to derive interior rotational rates and meridional flow velocities on global scales. In addition to the e…