Search Publications
Rotation of sunspots in active region NOAA 10930
Gopasyuk, O. S.
The rotation of sunspots of the active region NOAA 10930 has been investigated using a time series of vector magnetic field maps from the Solar Optical Telescope aboard Hinode. The vertical, radial and azimuthal axisymmetrical components of the magnetic field vector have been reconstructed from the magnetic field line-of-sight component for both s…
Radio reflection imaging of asteroid and comet interiors I: Acquisition and imaging theory
Sava, Paul; Ittharat, Detchai; Grimm, Robert +1 more
Imaging the interior structure of comets and asteroids can provide insight into their formation in the early Solar System, and can aid in their exploration and hazard mitigation. Accurate imaging can be accomplished using broadband wavefield data penetrating deep inside the object under investigation. This can be done in principle using seismic sy…
Transit time of CME/shock associated with four major geo-effective CMEs in solar cycle 24
Shanmugaraju, A.; Syed Ibrahim, M.; Bendict Lawrance, M.
The kinematics of coronal mass ejection (CME) in the interplanetary medium is very important in the concept of space-weather. Main aim of this paper is to study the propagation of four major geo-effective CMEs and their associated shocks observed in solar cycle 24. The arrival of interplanetary shocks and CMEs of these events near the Earth is see…
Filaments disappearance in relation to coronal mass ejections during the solar cycle 23
Mawad, R.; Shaltout, Mosalam; Yousef, M. +2 more
We have studied the relationship between filament disappearances with CMEs during solar period 1996-2010. We used the observed disappearing filaments in Hα data from Meudon given in NOAA, and coronal mass ejections data (CMEs) from SOHO/LASCO. We obtained 278 CME events (14%) contemporary filament disappearances and CME ejections (from a total of …
Preliminary empirical model of inner boundary of ion plasma sheet
Dandouras, I.; Cao, J. B.; Reme, H. +4 more
The penetration of the plasma sheet into the inner magnetosphere is important to both ring current formation and spacecraft charging at geosynchronous orbit. This paper, using hot ion data recorded by HIA of TC-1/DSP, establishes an empirical model of the inner boundary of ion plasma sheet (IBIPS) on the near equatorial plane. All IBIPS are locate…
Discovery of new X-ray sources near the unidentified gamma-ray source HESS J1841-055
Koyama, K.; Nobukawa, M.; Tsuru, T. G. +1 more
HESS J1841-055 is a diffuse unidentified gamma-ray source with the size of ∼1°.3 × 1°. No conclusive counterpart in other wavelengths has so far detected. To search for X-rays responsible for the TeV emission, the Suzaku observations were conducted, which covered a half region of the HESS source. In the soft band (0.5-2.0 keV), we discovered a dif…
A research on the force-freeness of photosphere magnetic field
Hao, J.; Liu, S.
In this paper, the statistical studies on the force-freeness of photosphere magnetic fields are given. The studies are based on the vector magnetic fields observed by Solar Optical Telescope/Spectro-Polarimeter (SOT/SP) on board Hinode. Three parameters (Fx /Fp,Fy /Fp , and Fz /Fp) …
Fine magnetic characteristics of a light bridge observed by Hinode
Liu, D.; Liu, S.
Light bridge (LB) is bright structure crossing the umbra of sunspots and associated to the breakup or assembly of sunspots. In this paper, a LB is presented and studied using the observatory data obtained by Hinode satellites. Force-free factor (α) and the z-component of current (Jz) and tension force (Tz) are calculated basi…
Statistical analysis of the magnetic fluctuations in boundary layers of Earth's magnetosphere
Savin, S. P.; Kozak, L. V.; Prokhorenkov, A. S.
Investigation of statistical features of the magnetic fluctuations in boundary layers of Earth's magnetosphere and plasma of the solar wind, on different time scales, is carried out using magnetic field measurements from Cluster-II with a sampling frequency of 22.5 Hz in 2007-2010. We have studied the changes of shape and parameters of probability…
Eruption of the magnetic flux rope in a quick decaying active region
Yang, Shangbin; Liu, Jihong; Xie, Wenbin
An isolated and quickly decaying active region (NOAA 9729) was observed as it passed across the solar disk. There was only one CME associated with the active region, which provides a good opportunity to investigate the whole process of the CME. A filament in this active region was observed to rise rapidly before stalling and disintegrating into fl…