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Flow in streamer boundaries, and streamer stability
Suess, S. T.; Nerney, S.
Streamers can extend to many solar radii but the closed field regions, or helmets, reach no higher than 2-4 solar radii. The brightness boundary defining streamers is therefore, a boundary between different flow regimes rather than between static plasma and expanding solar wind. It is reasonable to assume that, this boundary divides fast coronal h…
Shumann resonances and electromagnetic transparence in the atmosphere of Titan
Molina-Cuberos, G. J.; Eichelberger, H. U.; Schwingenschuh, K. +6 more
Among the multiple questions that the CASSINI/HUYGENS mission tries to answer is the likelihood of electric discharges in Titan's atmosphere. The instruments ``Huygens Atmospheric Structure Instrument'' and ``Radio and Plasma Wave Science'' will probe the electromagnetic emissions during the Huygens descent and Cassini flybys, respectively. Althou…
A serendipitous survey for galaxy clusters by the XMM-Newton Survey Science Center
Elvis, M.; Watson, M. G.; Lamer, G. +6 more
We describe the initial results of a programme to detect and identify extended X-ray sources found serendipitously in XMM-Newton observations. We have analyzed 186 EPIC-PN images at high galactic latitude with a limiting flux of 1 × 10 -14 erg cm -2 s -1 and found 62 cluster candidates. Thanks to the enhanced sensi…
Simulating Titan’s tropospheric circulation with the Portable University Model of the Atmosphere
Keller, H. U.; Grieger, B.; Rodin, A. V. +4 more
The Portable University Model of the Atmosphere (PUMA) is a general circulation model of intermediate complexity. In the model setup used herein, the dynamics is driven by restoration to a prescribed temperature field. Given an observed three-dimensional field of restoration temperatures, the feedback of aerosol distribution to the radiation schem…
Chandra observations of SNR 1987A
McCray, R.; Hasinger, G.; Garmire, G. P. +4 more
We report on the results of our monitoring program of the X-ray remnant of supernova 1987A with the Chandra X-ray Observatory. We have performed two new observations during the Chandra Cycle 3 period, bringing the total to six monitoring observations over the past three years. These six observations provide a detailed time history of the birth of …
The X-ray halo of G21.5 - 0.9
Bocchino, F.; Bandiera, R.
The emission of the plerion G21.5 - 0.9 appears more extended in X-rays than in radio. This is an unexpected result because it would imply that short-lived X-ray electrons may reach distances even larger than radio electrons. Applying an empirical relationship between dust scattering optical depth and photoelectric column density, the measured col…
XMM-Newton observations of the Vela pulsar
Zane, S.; Hailey, C. J.; Mori, K. +1 more
We present spectral analysis from XMM-Newton observations of the Vela pulsar. We analyzed thermal emission from the pulsar dominating below ~1 keV since extracted spectra are heavily contaminated by nebular emission at higher energy. Featureless high-resolution spectra of the reflection grating spectrometer aboard XMM-Newton suggest the presence o…
Investigation of the source region of ionospheric oxygen outflow in the cleft/cusp using multi-spacecraft observations by CIS onboard Cluster
Lundin, R.; Dandouras, I.; Klecker, B. +18 more
Beams of singly ionized oxygen with narrow energy distributions originating in the dayside cleft/cusp region are frequently observed in the cleft, cusp and polar cap regions by the CODIF sensor of the CIS instrument onboard Cluster. During summer and fall of 2001, the high separation distances of ∼1 Re between the spacecraft provided a good opport…
On coronal streamer changes
Howard, R. A.; Gopalswamy, N.; Shibasaki, K. +3 more
Coronal streamer represents one of the pre-eruption configurations of coronal mass ejections (CMEs), because they overlie prominences and often possess all the substructures of CMEs. In this paper, we report on a study of streamer changes associated with prominence eruptions. The prominence eruptions and streamer changes were observed by the Nobey…
Development of a micro-balance system for dust and water vapour detection in the Mars atmosphere
Colangeli, L.; Palumbo, P.; Palomba, E. +2 more
Quartz crystal piezoelectric sensors are suitable for deposition analyses that need very high sensitivity. Due to the wide working ranges and high performances, micro-balances can measure the mass settling in average Mars conditions during a period of months before saturation is reached. This ensures a proper use for short and long term water and …