Search Publications
Comparing methane and temperature profiles on Titan in 1980 and 2005
Fulchignoni, M.; Ferri, F.; Griffith, C. A. +1 more
The Huygens Probe data provided a direct measurement of CH 4, temperature, and pressure in Titan's atmosphere. This data can be used to compare to the Voyager data in which the effects of CH 4, temperature, and pressure were mixed together. Comparison with Huygens data indicates that values of the surface relative humidity of…
Magnetopause reconnection impact parameters from multiple spacecraft magnetic field measurements
Wendel, Deirdre E.; Reiff, Patricia H.
We present a novel technique that exploits multiple spacecraft data to determine the impact parameters of the most general form of magnetic reconnection at the magnetopause. The method consists of a superposed epoch of multiple spacecraft magnetometer measurements that yields the instantaneous magnetic spatial gradients near a magnetopause reconne…
VLT optical observations of the isolated neutron star RX J0420.0-5022
Haberl, F.; Motch, C.; Mignani, R. P. +3 more
Context: X-ray observations performed with the Röntgen Satellite (ROSAT) led to the discovery of seven radio-silent isolated neutron stars (INSs) which are detected only through the relatively dim and purely thermal X-ray emission from the cooling star surface. A few of these INSs (X-ray Dim INSs, or XDINSs) have been also detected at optical wave…
Electron density in the quiet solar coronal transition region from SoHO/SUMER measurements of S VI line radiance and opacity
Vial, J. -C.; Buchlin, E.
Context: The steep temperature and density gradients that are measured in the coronal transition region challenge the model interpretation of observations.
Aims: We derive the average electron density < ne > in the region emitting the S vi lines. We use two different techniques, which allow us to derive linearly-weighted (opac…
Transit detections of extrasolar planets around main-sequence stars. I. Sky maps for hot Jupiters
Mislis, D.; Heller, R.; Antoniadis, J.
Context: The findings of more than 350 extrasolar planets, most of them nontransiting Hot Jupiters, have revealed correlations between the metallicity of the main-sequence (MS) host stars and planetary incidence. This connection can be used to calculate the planet formation probability around other stars, not yet known to have planetary companions…
Orbits of Comets C/1845 L1 (Great June Comet) and C/1846 D1 (de Vico)
Branham, R. L., Jr.
Orbits are calculated for Comet C/1845 L1 (the Great June Comet) and C/1846 D1 (de Vico), the former based on 157 observations in right ascension and 152 in declination and the latter on 10 and 9, respectively. Both orbits are hyperbolic and statistically distinguishable from parabolas. Statistical tests indicate that the residuals are random and …
Rebuttal to “Comment on “Evidence of electrical activity on Titan drawn from the Schumann resonances sent by Huygens probe” by J.A. Morente, J.A. Portí, A. Salinas, and E.A. Navarro [2008, Icarus, 195, 802-811]”
Morente, Juan A.; Portí, Jorge A.; Navarro, Enrique A. +1 more
Hamelin et al. criticize some conclusions of our paper [Morente, J.A., Portí, J.A., Salinas, A., Navarro, E.A., 2008. Icarus 195, 802-811]. This rebuttal is our response to their criticism. In our view, their comments are contradictory and not based on scientific argument. Our paper presents a comprehensible methodology for extracting weak resonan…
Preliminary results on the pulsations of Be stars with CoRoT
Frémat, Y.; Neiner, C.; Janot-Pacheco, E. +13 more
We present preliminary results of the study of pulsations of Be stars from CoRoT observations. CoRoT detected many pulsation frequencies in all observed Be stars, usually interpreted in terms of g-modes but sometimes also corresponding to p-modes. Even in late Be stars, for which the detection of pulsation frequencies is very difficult from the gr…
Magnetospheric solitary structure maintained by 3000 km/s ions as a cause of westward moving auroral bulge at 19 MLT
Lundin, R.; Yamauchi, M.; Balogh, A. +11 more
In the evening equatorial magnetosphere at about 4 RE geocentric distance and 19 MLT, the four Cluster spacecraft observed a solitary structure with a width of about 1000~2000 km in the propagation direction. The solitary structure propagates sunward with about 5~10 km/s carrying sunward electric field (in the propagation direction) of …
A Statistical Study of the Relationship Between the Transport Rate of Magnetic Helicity and Solar Flares
Tan, Baolin; Zhang, Yin; Yan, Yihua
We present a statistical study which is aimed at understanding the fact that some flares (type I flare) are associated with sharp variations of the transport rate of magnetic helicity (dH/dt) while others are not (type II flare). The sample consists of 49 M-class and X-class flares which were produced by nine isolated active regions. Using high te…