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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…
Timeline analysis and wavelet multiscale analysis of the AKARI All-Sky Survey at 90µm
Goto, Tomotsugu; Nakagawa, Takao; Shirahata, Mai +17 more
We present a careful analysis of the point-source detection limit of the AKARI All-Sky Survey in the WIDE-S 90-µm band near the North Ecliptic Pole (NEP). Timeline analysis is used to detect IRAS (Infrared Astronomy Satellite) sources and then a conversion factor is derived to transform the peak timeline signal to the interpolated 90-µ…
Iterative inversion of global magnetospheric information from energy neutral atom (ENA) images recorded by the TC-2/NUADU instrument
Barabash, S.; Shen, Chao; Cao, JinBin +5 more
A method is presented for retrieving the magnetospheric ion distribution from Energetic Neutral Atom (ENA) measurements made by the NUADU instrument on the TC-2 spacecraft. Based on the already well-established method of constrained linear inversion, an iterance technique suitable for the low count ENA measurements has been developed which is tole…
Coordinated Cluster and Double Star observations of the dayside magnetosheath and magnetopause at different latitudes near noon
Escoubet, C. P.; Pitout, F.; Dandouras, I. +5 more
We present results of a favorable conjunction where the equatorial spacecraft (TC-1) of the Double Star mission exits the dayside magnetopause near the equator, while Cluster is inbound, near the southern cusp. This configuration makes it possible to compare observations of the magnetopause, around the same magnetic local time but at different lat…