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Formation of Transient Coronal Holes during the Eruption of a Quiescent Filament and its Overlying Sigmoid
Yang, Li-Heng; Jiang, Yun-Chun; Ren, Dong-Bai
By using Hα, He I 10830, EUV and soft X-ray (SXR) data, we examined a filament eruption that occurred on a quiet-sun region near the center of the solar disk on 2006 January 12, which disturbed a sigmoid overlying the filament channel observed by the GOES-12 SXR Imager (SXI), and led to the eruption of the sigmoid. The event was associated with a …
XMM-Newton Detection of a Compton-thick AGN in the 1 Jy ULIRG/LINER F04103-2838
Veilleux, S.; Sanders, D. B.; Young, A. J. +3 more
We report on the detection of Fe Kα emission in F04103-2838, an ultraluminous infrared galaxy [ULIRG; log (LIR/L⊙) >= 12] optically classified as a LINER. Previous Chandra observations suggested the presence of both a starburst and an active galactic nucleus (AGN) in this source. A deeper (~20 ks) XMM-Newton spectrum revea…
Near-Infrared Spectra of 21 Wolf-Rayet Stars: Wind Clumping and Mass-Loss Rates
Miyata, Takashi; Motohara, Kentaro; Nishimaki, Yuichirou +2 more
We present 0.9-2.4µm spectra of 21 galactic Wolf-Rayet (WR) stars that were obtained by using an echelle spectrograph attached to the 1.5m infrared telescope in Tokyo. The observed Wolf-Rayet stars contain 12WNE, 3WNL, and 6WC stars. The near-infrared continuum spectra can be fitted by the superposition of stellar blackbody radiation with a …
MARSIS subsurface radar investigations of the South Polar reentrant Chasma Australe
Gurnett, D. A.; Farrell, W. M.; Plaut, J. J. +12 more
The Mars Express/Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) has conducted the first-ever subsurface probing of the south polar layered deposits (SPLD) revealing internal structure that is rich in detail. We report on subsurface features detected from a set of orbits that passed over the largest of the south polar reentran…
Multi-spacecraft observations of ULF waves during the recovery phase of magnetic storm on October 30, 2003
Pu, Z. Y.; Zong, Q. G.; Xie, L. +4 more
Prominence modelling: from observed emission measures to temperature profiles
Heinzel, P.; Anzer, U.
Aims:We outline the construction of prominence - corona transition region models based upon the observations of one particular prominence.
Methods: The differential emission measure curves from observations were approximated by simple analytical functions. On this basis we constructed the temperature curve and calculated the radiative losses, …
Acoustic Radius Measurements from MDI and GONG
Hill, F.; Kholikov, S.
We study the temporal autocorrelation function (ACF) of global solar oscillations. It is well known that the "large frequency separation" is proportional to the solar acoustic radius. We analyze the ACF of MDI and GONG spherical-harmonic-coefficient time series for degrees ℓ=0−3. Acoustic radius measurements obtained from the first dominant peak l…
Phase models of the Milky Way stellar disc
Orlov, V. V.; Rodionov, S. A.
We present a new iterative method for constructing equilibrium phase models of stellar systems. Importantly, this method can provide phase models with arbitrary mass distributions. The method is based on the following principle. Our task is to generate an equilibrium N-body system with a given mass distribution. For this purpose, we let the system…
Simultaneous tracking of reconnected flux tubes: Cluster and conjugate SuperDARN observations on 1 April 2004
Lester, M.; Dunlop, M. W.; Taylor, M. G. G. T. +7 more
While the Cluster spacecraft were located near the high-latitude magnetopause, between 11:30-13:00 UT on 1 April 2004, a series of medium to large scale (40 nT, 0.6-1.2 Re) FTEs were observed. During this pass, simultaneous and conjugated SuperDARN measurements are available that show a global flow pattern which is consistent with the expected (ma…
Can the Flyby Anomalies be Explained by a Modification of Inertia
McCulloch, M. E.
The flyby anomalies are unexplained velocity increases of 3.92, 13.46, 0.11 and 1.82 mm/s observed near closest approach during the Earth flybys of the Galileo, NEAR, Cassini and Rosetta spacecraft respectively. Here, these flybys are modelled using a theory called Modified Inertia due to a Hubble-scale Casimir effect (MIHsC). The model suggests t…