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A reconstruction method for the reconnection rate applied to Cluster magnetotail measurements
Penz, T.; Kubyshkin, I. V.; Nakamura, R. +6 more
We apply a theoretical model to describe the behavior of nightside flux transfer events (NFTEs) measured by Cluster satellites in the Earth magnetotail. Based on the Cagniard deHoop method we calculate the magnetic field and plasma flow time series observed by a satellite. Our aim is to solve an inverse problem to obtain the reconnection rate from…
Structure and Evolution of White Dwarfs and their Interaction with the Local Interstellar Medium
Werner, K.; Barstow, M. A.
The development of far-UV astronomy has been particularly important for the study of hot white dwarf stars. A significant fraction of their emergent flux appears in the far-UV and traces of elements heavier than hydrogen or helium are, in general, only detected in this waveband or at shorter wavelengths that are also only accessible from space. Al…
Huygens entry emission: Observation campaign, results, and lessons learned
de Pater, Imke; Lorenz, Ralph D.; Lemmon, Mark T. +8 more
An attempt was made to observe from Earth the emission from the shock layer and ``meteor trail'' formed during the Huygens probe's hypersonic entry into Titan's atmosphere. Although many observations were wiped out by weather or in-orbit failure, two observations constrain the emission from the entry. Several important lessons for future observati…
Discovery of an Eclipsing X-Ray Binary with a 32.69 hr Period in M101: An Analog of Her X-1 or LMC X-4?
Liu, Jifeng; Di Stefano, Rosanne; Kuntz, Kip +3 more
We report the discovery of an eclipsing X-ray binary in M101, the first such system to be discovered outside the Local Group. Based on a sequence of 25 Chandra observations that sample a wide range of orbital phases, we find a period of 32.688+/-0.002 hr, which we interpret as an orbital period. The folded light curve exhibits an eclipse lasting a…
Radial mean velocity in the solar neighbourhood
Cubarsi, R.; Alcobé, S.
A large sample with the full space motions drawn from the Hipparcos Catalogue allows us to select some nested subsamples containing an increasing number of thick disk stars. Segregated thick disk populations show a progressive decreasing vertex deviation according to a trend of axial symmetry, as well as an increasing velocity dispersion and mean …
Discrimination between Jovian radio emissions and Saturn electrostatic discharges
Gurnett, D. A.; Kurth, W. S.; Fischer, G. +5 more
Short vertical streaks in the dynamic spectrum of the Cassini/RPWS (Radio and Plasma Wave Science) receiver in the frequency range of a few MHz can be due to Jovian radio emissions or SEDs (Saturn electrostatic discharges). Although Jupiter is increasingly far from Cassini, the peaks of decametric Jovian arcs can still be detected a few dB above t…
High-resolution X-ray spectra of solar flares
Doschek, G. A.
I discuss high-resolution solar flare soft X-ray spectra and also comment on some recent results from extreme ultraviolet (EUV) spectroscopy. Spectra of solar flares at these wavelengths have been recorded since the late 1960s, beginning primarily with the NASA Orbiting Solar Observatory (OSO) series of spacecraft. Knowledge of EUV flare spectra t…
Shell-instability generated waves by low energy electrons on converging magnetic field lines
Vaivads, A.; Bogdanova, Y. V.; Décréau, P. M. E. +3 more
Wave emissions at electron cyclotron harmonics and at frequencies above the local plasma frequency are commonly observed in different magnetospheric regions. We show that such emissions when observed in the cusp, mantle or polar cap can be generated by shell-type electron distributions. We present an example of observations of such shell type dist…
Swift and XMM-Newton observations of the dark GRB 050326
Campana, S.; Tagliaferri, G.; Cusumano, G. +30 more
We present Swift and XMM-Newton observations of the bright gamma-ray burst GRB 050326, detected by the Swift Burst Alert Telescope. The Swift X-Ray Telescope (XRT) and XMM-Newton discovered the X-ray afterglow beginning 54 min and 8.5 h after the burst, respectively. The prompt GRB 050326 fluence was (7.7±0.9) × 10-6 erg cm-2…
The Morphology of Decimetric Emission from Solar Flares: GMRT Observations
Janardhan, P.; Kundu, M. R.; White, S. M. +3 more
Observations of a solar flare at 617 MHz with the Giant Meter-wave Radio Telescope (GMRT) are used to study the morphology of flare radio emission at decimetric wavelengths. There has been very little imaging in the 500 - 1000 MHz frequency range, but it is of great interest, since it corresponds to densities at which energy is believed to be rele…