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Long-period oscillations in solar coronal bright points
Li, S.; Tian, H.; Xia, L. -D.
Aims: By analyzing TRACE (Transition Region and Coronal Explorer) data, we investigate intensity oscillations in coronal bright points (BPs) as well as the underlying chromosphere.
Methods: A Fourier analysis is applied to a sequence of images observed in the 195 Å and 1216 Å passbands of TRACE. We produce images of Fourier power in three diff…
A Search for New Galactic Magnetars in Archival Chandra and XMM-Newton Observations
Miller, J. M.; Muno, M. P.; Gaensler, B. M. +2 more
We present constraints on the number of Galactic magnetars, which we have established by searching for sources with periodic variability in 506 archival Chandra observations and 441 archival XMM-Newton observations of the Galactic plane (| b| < 5°). Our search revealed four sources with periodic variability on timescales of 200-5000 s, all of w…
Non-Gaussian Line Profiles in a Large Solar Flare Observed on 2006 December 13
Mariska, J. T.; Hara, H.; Watanabe, T. +4 more
We have studied the characteristics of the non-Gaussian line profile of the Fe XIV 274.20 Å line in and around a flare arcade. We found that broad non-Gaussian line profiles associated with redshifts are observed in the flare arcade. There were two typical types of broad line profiles. One was a distorted line profile caused by multiple flows, and…
A Statistical Study of Solar Active Regions That Produce Extremely Fast Coronal Mass Ejections
Wang, Yuming; Zhang, Jie
We present statistical results on the properties of the solar source regions that produced the 57 fastest (>=1500 km s-1) front-side coronal mass ejections (CMEs) from 1996 June to 2007 January. The properties of these fast-CME-producing regions, 35 in total, are compared with those of all 1143 active regions (ARs) in the period stud…
INTEGRAL observations of the variability of OAO 1657-415
Klochkov, D.; Santangelo, A.; Wilms, J. +7 more
Context: The Galactic Plane Scan (GPS) was one of the core observation programmes of the INTEGRAL satellite. The highly variable accreting pulsar
Aims: We investigate the spectral and timing properties of OAO 1657-415 and their variability on short and long time scales in …
X-ray spectral variability in PG 1535+547: the changing look of a ``soft X-ray weak'' AGN
Cappi, M.; Vignali, C.; Schartel, N. +5 more
Context:
A New Forecasting Index for Solar Wind Velocity Based on EIT 284 Å Observations
Luo, Bingxian; Zhong, Qiuzhen; Liu, Siqing +1 more
Various solar wind forecasting methods have been developed during the past decade, such as the Wang - Sheeley model and the Hakamada - Akasofu - Fry Version 2 (HAFv2) model. Also, considerable correlation has been found between the solar wind speed v and the coronal hole (CH) area AM on the visible side of the Sun, showing quantitative …
The imaging performance of the SRC on Mars Express
Williams, D.; Jaumann, R.; Oberst, J. +14 more
The Mars Express spacecraft carries the pushbroom scanner high-resolution stereo camera (HRSC) and its added imaging subsystem super resolution channel (SRC). The SRC is equipped with its own optical system and a 1024×1024 framing sensor. SRC produces snapshots with 2.3 m ground pixel size from the nominal spacecraft pericenter height of 250 km, w…
Toward a Robust Estimate of the Merger Rate Evolution Using Near-IR Photometry
Hammer, Francois; Kembhavi, Ajit K.; Rawat, A. +1 more
We use a combination of deep, high angular resolution imaging data from the CDFS (HST/ACS GOODS survey) and ground-based near-IR Ks images to derive the evolution of the galaxy major merger rate in the redshift range 0.2 <= z<= 1.2. We select galaxies solely on the basis of their J-band rest-frame absolute magnitude, which is a go…
Reappraising Transition Region Line Widths in Light of Recent Alfvén Wave Discoveries
De Pontieu, Bart; McIntosh, Scott W.; Tarbell, Theodore D.
We provide a new interpretation of ultraviolet transition region emission line widths observed by the SUMER instrument on the Solar and Heliospheric Observatory (SOHO). This investigation is prompted by observations of the chromosphere at unprecedented spatial and temporal resolution from the Solar Optical Telescope (SOT) on Hinode revealing that …