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Hydrodynamical and radiative transfer modeling of meteoroid impacts into Saturn's rings
Sugita, Seiji; Cuzzi, Jeffrey N.; Asphaug, Erik +2 more
In a small hypervelocity impact, superheated gas and particles glow brightly with thermal emission for a brief time interval at short wavelengths; this phenomenon is referred to as an impact flash. Over the past decade, impact flashes have been observed on the Moon and in the laboratory in both the IR and visible portions of the spectrum. These ph…
The Spitzer View of Low-Metallicity Star Formation. II. Mrk 996, a Blue Compact Dwarf Galaxy with an Extremely Dense Nucleus
Hunt, Leslie K.; Thuan, Trinh X.; Izotov, Yuri I.
We present new Spitzer, UKIRT, and MMT observations of the blue compact dwarf galaxy (BCD) Mrk 996, with an oxygen abundance of 12 + log (O/H) = 8.0. This galaxy possesses an extraordinarily dense nuclear star-forming region, with a central density of ~106 cm-3, a very red color J - K = 1.8, broad- and narrow-line components,…
The early-type semidetached binary system V716 Centaurus
Demircan, O.; Bakış, V.; Eker, Z. +1 more
New high-resolution spectra of V716 Cen revealed for the first time lines of the secondary component and its radial velocities. The simultaneous solution of the new radial velocity curves and the Hipparcos light curve yield the reliable absolute dimensions of this semidetached system. The masses for the primary and secondary are M1 = 5.…
An effort to derive an empirically based, inner-magnetospheric electric field model: Merging Cluster EDI and EFW data
Khotyaintsev, Y.; Matsui, H.; Jordanova, V. K. +2 more
A key ingredient for modelling many inner-magnetospheric processes is the realistic representation of the spatio-temporal dynamics of the inner-magnetospheric electric field, or, IMEF. The Cluster Mission provides a unique opportunity to construct an IMEF model using electric field measurements from both the electron drift instrument (EDI) and the…
Transport of transient solar wind particles in Earth's cusps
Dandouras, I.; Rème, H.; Parks, G. K. +7 more
An important problem in space physics still not understood well is how the solar wind enters the Earth's magnetosphere. Evidence is presented that transient solar wind particles produced by solar disturbances can appear in the Earth's mid-altitude (~5 RE geocentric) cusps with densities nearly equal to those in the magnetosheath. That t…
Variations in the chorus source location deduced from fluctuations of the ambient magnetic field: Comparison of Cluster data and the backward wave oscillator model
Gurnett, D. A.; Pickett, J. S.; Trakhtengerts, V. Y. +5 more
We study the motion of the source region of magnetospheric chorus emissions using multipoint measurements of VLF wave emissions and geomagnetic field onboard the Cluster spacecraft. The geomagnetic field data are matched to a parameterized model of the local magnetic field, and the spatiotemporal dynamics of the magnetic field are obtained on this…
Radiation Effects on Stressed Ge:Ga Array Detector of Far-Infrared Surveyor on AKARI
Nakagawa, Takao; Shirahata, Mai; Doi, Yasuo +6 more
AKARI, the Japanese infrared astronomical satellite, was launched on 2006 February 21 (UT) and put into a sun-synchronous polar orbit at an altitude of 700 km. Cosmic radiations, particularly protons in the South Atlantic Anomaly (SAA), were expected to affect the performance of the stressed Ge:Ga array far-infrared detector on board AKARI. One of…
Imaging the heliosheath using HSTOF energetic neutral atoms and Voyager 1 ion data
Hsieh, K. C.; Hilchenbach, M.; Czechowski, A. +2 more
Context: Voyager 1 and 2 LECP instruments measure the distributions of the heliosheath ions of energies ≥40 keV. This threshold energy is an order of magnitude higher than the maximum energy (6 keV) of the energetic neutral atoms (ENA) to be measured by the forthcoming IBEX mission. On the other hand, the energy range of SOHO/CELIAS/HSTOF ENA meas…
FESTIVAL: A Multiscale Visualization Tool for Solar Imaging Data
Auchère, F.; Bocchialini, K.; Soubrié, E. +1 more
Since 4 December 2006, the SECCHI instrument suites onboard the two STEREO A and B probes have been imaging the solar corona and the heliosphere on a wide range of angular scales. The EUVI telescopes have a plate scale of 1.7 arcseconds pixel−1, while that of the HI2 wide-angle cameras is 2.15 arcminutes pixel−1, i.e. 75 time…
The Very Soft X-Ray Spectrum of the Double Pulsar System J0737-3039
Camilo, F.; Rea, N.; Possenti, A. +5 more
We present the results of an 80 ks Chandra ACIS-S observation of the double pulsar system J0737-3039. Furthermore, we report on spectral, spatial and timing analysis of the combined X-ray observations performed so far for this system. Fitting a total of ~1100 photons, we show that the X-ray spectrum of the J0737-3039 system is very soft, and not s…