Search Publications
Lyman alpha imaging of solar activity on the interplanetary hydrogen screen for space weather forecasting
Takahashi, Y.; Fukunishi, H.; Watanabe, S. +2 more
Interplanetary hydrogen atoms that penetrate into the heliosphere are illuminated by enhanced hydrogen Lyman alpha emission from solar active regions. Using the data obtained by the Solar Wind Anisotropies (SWAN) instrument on board the Solar and Heliospheric Observatory (SOHO), Bertaux et al. (2000) proposed a new method for earlier detection and…
Orbit correction without variational equations. The orbits of Caliban, 46P/Wirtanen and 67P/Churyumov-Gerasimenko
Aksnes, K.; Grav, T.
Differential orbit correction is performed by computing an osculating orbit from observations from which the perturbations have been subtracted. No variational equations need to be integrated except to solve for non-gravitational forces. The perturbations in the observations are obtained by subtracting a two-body orbit from an integrated, perturbe…
Comment on ``Rotation rate of Saturn's interior from magnetic field observations'' by Giacomo Giampieri and Michele K. Dougherty
Kaiser, M. L.; Desch, M. D.; Connerney, J. E. P. +2 more
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Chromospheric Internetwork Oscillations at Various Locations of the Quiet Sun
Ning, Zong-Jun; Ming-DeDing
We analyze oscillation behaviours in chromospheric internetwork regions using spectral observations of the CII 1334 Å line obtained with the Solar Ultraviolet Measurements of Emitted Radiation spectrograph (SUMER) aboard Solar and Heliospheric Observatory (SOHO). Three areas, 26×120arcsec2 each, at the various latitudes from …
Observation of reconnection pulses by Cluster and Double Star
Balogh, A.; Zhang, T. L.; Daly, P. W. +8 more
During a reconnection event on 7 August 2004, Cluster and Double Star (TC-1) were near the neutral sheet and simultaneously detected the signatures of the reconnection pulses. AT 22:59 UT tailward flow followed by earthward flow was detected by Cluster at about 15 RE, while earthward plasma flow followed by tailward flow was observed by…
Kyiv Meridian Axial Circle Catalogue (KMAC1) of stars in fields with extragalactic radio sources
Babenko, Yu.; Lazorenko, P.; Karbovsky, V. +3 more
The catalogue of astrometric (positions, proper motions) and photometric (B, V, R, r', J) data of stars in 192 fields with the ICRF objects has been compiled at the Main Astronomical Observatory of the National Academy of Sciences of Ukraine and the Astronomical Observatory of the Kyiv National University. All fields are located in declination zon…
Scale-dependent Anisotropy of Magnetic Fluctuations in the Earth's Plasma Sheet
Balogh, A.; Nakamura, R.; Baumjohann, W. +4 more
ASCA and XMM-Newton observations of A2029
Hudaverdi, M.; Furuzawa, A.; Yamashita, K. +4 more
The X-ray data of A2029 obtained with XMM-Newton show no evidence of an embedded AGN in the central region of this cluster, which was suggested from the analysis of restored ASCA image data, although some hot spots are seen within or around the central cD galaxy. The absence of AGN at the cluster center is consistent with the result of Chandra obs…
Why we need wide-field imaging from space to understand galaxy formation [review article]
Somerville, R. S.
Space-based imaging with the Hubble Space Telescope has demonstrated the many advantages of viewing galaxies from outside the Earth's atmosphere. Hubble has shown us the amazing complexity of galaxies in the nearby and high redshift universe in exquisite detail. However, because of the limited areas surveyed, the sample sizes remain relatively sma…
A first XMM-Newton look at the most X-ray-luminous galaxy cluster RX J1347.5 1145
Gitti, Myriam; Schindler, Sabine
We present the first results from an XMM-Newton observation of RX J1347.5 1145 (Z = 0.451), the most luminous X-ray cluster of galaxies currently known, with a luminosity LX = 6.0 ± 0.1 × 1045 erg s-1 in the (2 10) keV energy band. The cluster has an overall temperature of kT = 10.0 ± 0.3 keV and is not isothermal:…