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SWAN observations of 9P/Tempel 1 around the Deep Impact event
Bertaux, Jean-Loup; Combi, Michael R.; Mäkinen, J. Teemu T. +2 more
The SWAN instrument observed the coma of Comet 9P/Tempel 1 at Lyman alpha around the Deep Impact event. From these observations, a water production rate profile for 3 weeks after the impact was derived. The comet could not be identified in images taken before the impact because of the relatively low production rates. The most important feature of …
Cluster Observation and Analysis of Bifurcation Current Sheet Structure in a Quiet Time
Lu, Li; Tang, Chao-Ling; Li, Zhong-Yuan
We analyse the vertical structure of the magnetotail current sheet during 2011 2030 UT on 19 August 2001, during which the Cluster spacecrafts crossed the current sheet in a quiet time. In the intervals, the current sheet moved slowly, and the value of the AE index was relatively small, about 40 130 nT. In the quiet time, without fast plasma flow …
Comets and Chemical Composition
de Keyser, J.; Delanoye, S. N.
It is commonly believed that comets are made of primordial material. As a consequence, they can reveal more information about the origin of our solar system. To interpret the coma composition measurements of comet Churyumov Gerasimenko that will be collected by the Rosetta mission, models of the coma chemistry have to be constructed. However, prog…
Small-scale ion flux and magnetic field fluctuations in solar wind, foreshock and magnetosheath
Du, Jian; Wang, Chi; Shevyrev, N. N. +2 more
Positional correlation between NVSS and XMM-Newton sources
Combi, J. A.; Romero, G. E.; Martí, J. +5 more
We present the preliminary results of a cross-identification between radio, infrared and X-ray data, in order to study X-ray populations at low and high galactic latitudes. For this purpose, we developed an improved search strategy based on very restrictive selection criteria being applied to the sources, using the NVSS, 2MASS and XMM catalogs. Us…
Development of an n-channel CCD, CCD-NeXT1, for Soft X-ray Imager onboard the NeXT satellite
Takagi, Shin-Ichiro; Koyama, Katsuji; Matsumoto, Hironori +10 more
NeXT (New X-ray Telescope) is the next Japanese X-ray astronomical satellite mission after the Suzaku satellite. NeXT aims to perform wide band imaging spectroscopy. Due to the successful development of a multilayer coated mirror, called a supermirror, NeXT can focus X-rays in the energy range from 0.1 up to 80 keV. To cover this wide energy range…
INTEGRAL/XMM views on the MeV source GRO J1411-64
Torres, Diego F.; Zhang, Shu; Barcons, Xavier +9 more
The COMPTEL unidentified source GRO J 1411-64 was observed by INTEGRAL and XMM-Newton in 2005. The Circinus Galaxy is the only source detected within the 4σ location error of GRO J1411-64, but in here excluded as the possible counterpart. At soft X-rays, 22 reliable and statistically significant sources (likelihood >10) were extracted and analy…
U BV photoelectric photometry of the 1H/2H double mode cepheid CO Aurigae
Santangelo, M. M. M.; Cavalletti, G.; Benedetti, W.
We performed new U BV photoelectric photometry of the double mode cepheid CO Aur. A careful time series analysis, by means of various algorithms, of our light curves of CO Aur enabled us to confirm the two previously known periodicities (Antonello et al. 1986) and their ratio of about 0.800. This ratio can be explained if CO Aur is a double mode c…
Features of coronal mass ejections of minimum size
Eselevich, M. V.; Eselevich, V. G.
The coronal mass ejections (CME) with small angular dimensions (d ≤ 10°) have the simplest form, much simpler than large CME. This fact simplifies the problem of analyzing the CME structure and studying their origin. On the basis of the analysis of the LASCO C2 (SOHO) data, we show in this paper that the motion of a CME having small dimensions pro…
The Emerging Features of Bipolar Magnetic Regions during Solar Minima
Feng, Xueshang; Song, Wenbin
Solar magnetic synoptic charts obtained by NSO/Kitt Peak and SOHO/MDI are analyzed in order to study the appearance of bipolar magnetic regions (BMRs) during solar minima. We find that the emergence of long-lived BMRs have three typical features. (1) The emergence rate of BMRs in the new cycle increases about 3 times faster than the rate of the ol…