Search Publications
Observations of EUV and soft X-ray recurring jets in an active region
Bi, Yi; Yang, Li-Heng; Jiang, Yun-Chun +3 more
We present simultaneous observations of three recurring jets in EUV and soft X-ray (SXR), which occurred in an active region on 2007 June 5. By comparing their morphological and kinematic characteristics in these two different wavelengths, we found that EUV and SXR jets had similar locations, directions, sizes and velocities. We also analyzed thei…
Fractal dimension and thermodynamic fluctuation properties of IDV light curves
Leung, Chun-Sing; Wei, Jian-Yan; Kovács, Zoltan +1 more
Fractals are a basic tool for phenomenologically describing natural objects having a high degree of temporal or spatial variability. From a physical point of view the fractal properties of natural systems can also be interpreted by using the standard formalism of thermodynamical fluctuations. We introduce and analyze the fractal dimension of the I…
Observing the reconnection region in a transequatorial loop system
Liu, Chang; Stenborg, Guillermo; Liu, Rui +4 more
A vertical current sheet is a crucial element in many flare/coronal mass ejection (CME) models. For the first time, Liu et al. reported a vertical current sheet directly imaged during the flare rising phase with the EUV Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO). As a follow-up study, here we present the comprehe…
Systematic differences in position and proper-motion between the PPMX and UCAC3 catalogs
Zhu, Zi; Liu, Jia-Cheng; Hu, Bo
Considered to be extensions of the Hipparcos reference system, PPMX and UCAC3 are two of the most important astrometric catalogs released in current years. Extensive analyses of these two large catalogs have been made in order to determine the local and overall systematic biases. The regional and magnitude dependent differences in stellar position…
XMM-Newton observation of the eclipsing binary Algol
Chen, Li; Aschenbach, Bernd; Lu, Fang-Jun +1 more
We present an XMM-Newton observation of the eclipsing binary Algol which contains an X-ray dark B8V primary and an X-ray bright K2IV secondary. The observation covered the optical secondary eclipse and captured an X-ray flare that was eclipsed by the B star. The XMM-Newton European Photon Imaging Camera and Reflection Grating Spectrometer spectra …
Detailed study of B037 based on HST images
Ma, Jun
B037 is of interest because it is both the most luminous and the most highly reddened cluster known in M31. Deep observations and high spatial resolution images with the Advanced Camera for Surveys on the Hubble Space Telescope (HST) first showed that this cluster is crossed by a dust lane. Photometric data in the F606W and F814W filters obtained …