Search Publications
Footpoint Motion of the Continuum Emission in the 2002 September 30 White-Light Flare
Ding, M. D.; Chen, Q. R.
We present observations of the 2002 September 30 white-light flare, in which the optical continuum emission near the Hα line is enhanced by ~10%. The continuum emission exhibits a close temporal and spatial coincidence with the hard X-ray (HXR) footpoint observed by RHESSI. We find a systematic motion of the flare footpoint seen in the continuum e…
Thermal interactions of the Huygens probe with the Titan environment: Constraint on near-surface wind
Lorenz, Ralph D.
The Huygens probe lost heat to its cold environment during its descent through Titan's atmosphere and after landing. Here I report measurements of the probe's thermal behavior and comparison with ground tests (1) to provide a context for other scientific investigations, such as the release of volatiles from the landing site, and (2) to place const…
First ENA observations at Mars: Charge exchange ENAs produced in the magnetosheath
Coates, A. J.; Kallio, E.; Fedorov, A. +44 more
Measurements of energetic neutral atoms (ENA) generated in the magnetosheath at Mars are reported. These ENAs are the result of charge exchange collisions between solar wind protons and neutral oxygen and hydrogen in the exosphere of Mars. The peak of the observed ENA flux is 1.3×10 msrs. For the case studied here, i.e., the passage of Mars Expres…
A novel principle for an ion mirror design in time-of-flight mass spectrometry
Wurz, P.; Altwegg, K.; Balsiger, H. +7 more
A novel design for a gridless two-stage ion mirror, or reflectron, for time-of-flight mass spectrometry (TOFMS) will be presented. The development of this novel design was driven by the stringent engineering requirements for the ion mirror's utilization by the reflectron time-of-flight (RTOF) sensor in the Rosetta orbiter spectrometer for ion and …
INTEGRAL and RXTE Observations of Centaurus A
Rothschild, Richard E.; Staubert, Rüdiger; Wilms, Jörn +6 more
INTEGRAL and RXTE performed three simultaneous observations of the nearby radio galaxy Centaurus A in 2003 March, 2004 January, and 2004 February with the goals of investigating the geometry and emission processes via the spectral/temporal variability of the X-ray/low-energy gamma-ray flux, and intercalibration of the INTEGRAL instruments with res…
The ISO 170 µm luminosity function of galaxies
Dole, H.; Lagache, G.; Puget, J. -L. +3 more
We constructed a local luminosity function (LF) of galaxies using a flux-limited sample (S170 ≥ 0.195~Jy) of 55 galaxies at z < 0.3 taken from the <sl>ISO</sl> FIRBACK survey at 170 µm. The overall shape of the 170-µm LF is found to be different from that of the total 60-µm LF (Takeuchi et al. 2003): the…
Stratification in the broad line region of AGN: The two-component model
Bon, E.; Popović, L. Č.; Ilić, D. +1 more
Here we present our investigation of the kinematic structure of the broad emission line region (BLR) in a sample of 14 single-peaked Active Galactic Nuclei (AGN), which have been previously observed in the X-ray (Fe Kα line) and where, according to the X-ray emission, a disk geometry is expected. To explain the BLR complex structure we apply a two…
Plasma intrusion above Mars crustal fields—Mars Express ASPERA-3 observations
Coates, A. J.; Kallio, E.; Fedorov, A. +42 more
Using data of the ASPERA-3 instrument on board the European Mars Express spacecraft we investigate the effect of the martian crustal fields on electrons intruding from the magnetosheath. For the crustal field strength we use published data obtained by the Mars Global Surveyor MAG/ER instrument for a fixed altitude of 400 km. We use statistics on 1…
Capella Corona Revisited: A Combined View from XMM-Newton RGS and Chandra HETGS and LETGS
Sako, M.; Kahn, S. M.; Gupta, R. +2 more
We present a combined analysis of the X-ray emission of the Capella corona obtained with XMM-Newton RGS and Chandra HETGS and LETGS. An improved atomic line database and a new differential emission measure (DEM) deconvolution method are developed for this purpose. Our new atomic database is based on the Astrophysical Plasma Emission Database and i…
Long-lived Solar Neutron Emission in Comparison with Electron-produced Radiation in the 2005 September 7 Solar Flare
Tanaka, Y. T.; Yoshikawa, I.; Mukai, T. +23 more
Strong signals of neutral emissions were detected in association with a solar flare that occurred on 2005 September 7. They were produced by both relativistic ions and electrons. In particular, relativistic neutrons were observed with the solar neutron telescopes (SNTs) located at Mount Chacaltaya in Bolivia and Mount Sierra Negra in Mexico and wi…