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Interplanetary type II radio bursts and their association with CMEs and flares
Shanmugaraju, A.; Suresh, K.; Umapathy, S. +2 more
We study the characteristics of the CMEs and their association with the end-frequency of interplanetary (IP)-type-II bursts by analyzing a set of 138 events (IP-type-II bursts–flares–CMEs) observed during the period 1997–2012. The present analysis consider only the type II bursts having starting frequency
X-ray stars observed in LAMOST spectral survey
Shi, Jianrong; Han, Xianming L.; Lu, Hong-peng +1 more
X-ray stars have been studied since the beginning of X-ray astronomy. Investigating and studying the chromospheric activity from X-ray stellar optical spectra is highly significant in providing insights into stellar magnetic activity. The big data of LAMOST survey provides an opportunity for researching stellar optical spectroscopic properties of …
History of globulettes in the Milky Way
Grenman, Tiia; Elfgren, Erik; Weber, Hans
Globulettes are small (radii
GALEX far-ultraviolet observations of metal-poor subdwarfs
Smith, Graeme H.
Far-ultraviolet photometry derived from the GALEX satellite observatory has been compiled for a sample of metal-poor subdwarfs with
The astrometric signal of microlensing events caused by free floating planets
Nucita, Achille A.; De Paolis, Francesco; Hamolli, Lindita +1 more
Astrometric observations of microlensing events can be used to obtain important information about lenses. During these events, the shift of the position of the multiple image centroid with respect to the source star location can be measured. This effect, which is expected to occur on scales from micro-arcseconds to milli-arcseconds, depends on the…
A review of low-energy transfers
Dutt, Pooja
Low-energy transfers (LET) for lunar and interplanetary missions has received immense attention of the scientific community during the last few decades as its importance was understood by the success of JAXA's Hiten, ESA's SMART-1, NASA's GRAIL and ARTHEMIS missions, and several proposals, like the BepiColombo, Multi-Moon Orbiter and Europa Orbite…
Nonlinear model to study filamentation instability of circularly polarized dispersive Alfvén waves in solar wind plasmas
Sharma, R. P.; Sharma, Swati; Mishra, M. K.
This paper examines the small-scale solar wind turbulence driven in view of the Alfvén waves subjected to ponderomotive nonlinearity. Filamentation instability is known to take place for the case of dispersive Alfvén wave (DAW) propagating parallel to the ambient magnetic field. The ponderomotive force associated with DAW is responsible for wave l…
A two-fluid modeling of kinetic Alfvén wave turbulence
Moon, Y. -J.; Sharma, R. P.; Dwivedi, Navin Kumar +1 more
We present an analytical model to explore the magnetic field turbulent spectrum by coupled high-frequency kinetic Alfvén wave (KAW) and slow mode of Alfvén wave (AW). The spectrum is computed as a realization of energy cascades from larger to smaller scales for a specific case of solar wind plasma at 1 AU. A two-fluid technique is implemented for …