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Effective temperatures of magnetic CP stars: semi-fundamental data
Stępień, K.; Lipski, Ł.
A brief discussion of earlier determinations of effective temperatures of chemically peculiar stars is given. It is stressed that the effective temperature is a global parameter, important for stellar structure and evolution studies. It should, however, be used with caution in atmospheric investigations. New determinations of effective temperature…
Effects of Solar Magnetic Activity on the Charge States of Minor Ions of Solar Wind
Wurz, Peter; Klecker, Berndt; Wang, Xuyu
We present an investigation of the effects of solar magnetic activity on the charge states of minor ions (Fe, Si, Mg, Ne, O, C) in the solar wind using ACE solar wind data, the "current sheet source surface" (CSSS) model of the corona, and SOHO MDI data during the 23rd solar cycle. We find that the mean charge states indicate a clear trend of incr…
New progress of Double Star-Cluster joint exploration and study
Shen, Chao; Cao, JinBin; Lu, Li +3 more
The magnetic reconnection of magnetosphere and the magnetospheric space storms (including magnetospheric substorm, magnetic storm, magnetospheric particle storm) has long been one of the most challenging subjects in the solar-terrestrial physics. The reconnection mechanism and global triggering process of the magnetospheric space storms are still …
INTEGRAL and RXTE/ASM Observations on IGR J17098-3628
Zhang, Shu; Qu, Jin-Lu; Wang, Jian-Min +5 more
To further probe the possible nature of the unidentified source IGR J17098-3628, we have carried out a detailed analysis of its long-term time variability, as monitored by Rossi X-ray Timing Explorer/All Sky Monitor (RXTE/ASM), and of its hard X-ray properties, as observed by the International Gamma-Ray Astrophysics Laboratory (INTEGRAL). INTEGRAL…
On the probability of cryogenic mud volcanism on Titan
Alekseev, V. A.
Juxtaposing images of the surface of Titan made by the Huygens probe and photos of the mud volcano region on Earth (the Taman peninsula, the Caucasus) reveals similar geomorphologic features. This has led us to suggest the existence of cryogenic mud-volcanic activity on Titan. The role of liquid methane in supporting this process on Titan can be t…
Global-scale near infrared variability on Mars: Analysis of 2003 Mars opposition observations from HST/NICMOS
Wolff, M. J.; Noll, K.; Noe Dobrea, E. +3 more
We have used HST/NICMOS to observe approximately 57% of the martian surface in 7 narrow band filters (0.97, 1.08, 1.13, 1.66, 1.90, 2.12, and 2.15 µm) during the 2003 opposition ( L∼250°) and at a resolution of ∼12 km/pixel. Principal components analysis (PCA) of the dataset has identified regional variability on scales of hundreds of kilome…
Study of Long-lived Radioactive Sources in the Galaxy with INTEGRAL/SPI
Wang, Wei
Multi-Spacecraft Turbulence Analysis Methods
Osman, Kareem T.; Horbury, Tim S.
Turbulence is ubiquitous in space plasmas, from the solar wind to supernova remnants, and on scales from the electron gyroradius to interstellar separations. Turbulence is responsible for transporting energy across space and between scales and plays a key role in plasma heating, particle acceleration and thermalisation downstream of shocks. Just a…
Rebuttal to “Comment on the paper “Comparison of the composition of the Tempel 1 ejecta to the dust in Comet C/Hale Bopp 1995 O1 and YSO HD 100546” by C.M. Lisse, K.E. Kraemer, J.A. Nuth III, A. Li, and D. Joswiak"
Lisse, C. M.
This response is to address the comments made by Drs. J. Crovisier and D. Bockelee-Morvan concerning the spectral analysis of Lisse et al. [Lisse, C.M., Kraemer, K.E., Nuth, J.A., Li, A., Joswiak, D., 2007. Icarus 187, 69-86] of the mid-IR ISO SWS spectrum of Comet Hale-Bopp 1995 O1 taken on October 6, 1996, and to support the conclusions made in …
ISINA: INTEGRAL Source Identification Network Algorithm
Hill, A. B.; Bird, A. J.; Scaringi, S. +4 more
We give an overview of ISINA: INTEGRAL Source Identification Network Algorithm. This machine learning algorithm, using random forests, is applied to the IBIS/ISGRI data set in order to ease the production of unbiased future soft gamma-ray source catalogues. First, we introduce the data set and the problems encountered when dealing with images obta…