Search Publications
The bi-directional moving structures in a coronal bright point
Li, Dong; Ning, Zongjun; Su, Yingna
We report the bi-directional moving structures in a coronal bright point (CBP) on 2015 July 14. It is observed by the Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory (SDO). This CBP has a lifetime of ∼10 minutes, and a curved shape. The observations show that many bright structures are moving intermittently outward from the C…
Kelvin–Helmholtz instability in an active region jet observed with Hinode
Srivastava, A. K.; Zhelyazkov, I.; Chandra, R.
Over past ten years a variety of jet-like phenomena were detected in the solar atmosphere, including plasma ejections over a range of coronal temperatures being observed as extreme ultraviolet (EUV) and X-ray jets. We study the possibility for the development of Kelvin–Helmholtz (KH) instability of transverse magnetohydrodynamic (MHD) waves travel…
Study of magnetic field geometry and extinction in Bok globule CB130
Das, H. S.; Chakraborty, A.
We trace the peripheral magnetic field structure of Bok globule CB130 by estimating the linear polarization of its field stars in the R band. The magnetic field orientation sampled by these stars, aligned on average among themselves, and the polarization produced within the cloud has a different direction from that of Galactic plane with an offset…
Improved SOT (Hinode mission) high resolution solar imaging observations: 2—Photometric properties of sunspot umbral dots
Koutchmy, S.; Adjabshirizadeh, A.; Goodarzi, H.
The origin and evolution of solar sunspots in deep photospheric layers are not yet well understood. The case of a quasi-symmetric single mature sunspot near the solar centre is selected for analysis. We use the best available observations of the partial Sun free of turbulent Earth atmospheric effects from the Solar Optical Telescope (SOT) onboard …
Potential role of kinetic Alfvén waves and whistler waves in solar wind plasmas
Goldstein, M. L.; Sharma, R. P.; Nandal, P. +1 more
Spacecraft observations indicate the signatures of highly oblique kinetic Alfvén waves (KAWs) and whistler waves in the solar wind plasma. In the present work, we explore the possible role of KAWs and whistler waves in the observed solar wind magnetic turbulent spectrum. The nonlinear spatial evolution of KAW is studied including the effects of th…
Possible gamma-ray burst radio detections by the Square Kilometre Array. New perspectives
Capozziello, Salvatore; Ruggeri, Alan Cosimo
The next generation interferometric radio telescope, the Square Kilometre Array (SKA), which will be the most sensitive and largest radio telescope ever constructed, could greatly contribute to the detection, survey and characterization of Gamma Ray Bursts (GRBs). By the SKA, it will be possible to perform the follow up of GRBs even for several mo…
Spectral behavior of Nova GQ Mus in the ultraviolet
Sanad, M. R.; Abdel-Sabour, M. A.
We present ultraviolet spectroscopic study of nova GQ Mus observed with the International Ultraviolet Explorer (IUE) during the period 1983–1985. Different spectra showing the changes in line fluxes at different times are presented. The outflow velocity of the ionized ejecta was calculated to be 1010–2900
The classification of cislunar trajectories and its applications in the Earth–Moon system
Xu, Ming; Xu, Shijie; Liang, Yuying
This paper considers the evolvement of cislunar transfers and addresses two distinct types, i.e., direct and low-energy transfers based on Apollo and SMART-1 missions. Both direct and low-energy trajectories are discussed systematically in the context of restricted three-body dynamics in this paper. The differences between them are assessed by con…
Evaluation of standoff distance method to determine the coronal magnetic field using CME-driven shocks
Shanmugaraju, A.; Suresh, K.; Syed Ibrahim, M.
We have analyzed the propagation characteristics of four limb coronal mass ejections (CMEs) with their shocks. These CMEs were observed in 18 frames up to 18 solar radii using LASCO white light images. Gopalswamy and Yashiro (Astrophys. J. 736:L17, 2011) introduced the standoff distance method (SOD) to find the magnetic field in the corona using C…
Multi-satellite observations of energy transport during an intense geomagnetic storm
Dunlop, M. W.; Duan, Aiying; Ma, Yuduan +1 more
Energy transport during a geomagnetic substorm is a very important process for solar wind-magnetosphere energy coupling and the energy cycle in the magnetotail. In this paper, we use magnetotail data from the five THEMIS probes and two Cluster satellites on the dayside to investigate the energy transport of one intense storm during the period from…