Search Publications
The AKARI Deep Field-South: Spitzer 24- and 70-µm observations, catalogues and counts
Clements, D. L.; Pearson, C.; Shirahata, M. +3 more
The AKARI Deep Field-South (ADF-S) is a ∼12 deg2 region near the South Ecliptic Pole that has been observed with deep scans in the far-infrared by the AKARI satellite. As such it is becoming one of the key extragalactic survey fields. We here present complementary observations of the ADF-S conducted by the Spitzer Space Telescope at wav…
Fast tailward flows in the plasma sheet boundary layer during a substorm on 9 March 2008: THEMIS observations
Zhang, T. L.; Glassmeier, K. -H.; Nakamura, R. +12 more
Tailward flows in the plasma sheet boundary layer (PSBL) were observed simultaneously by the five Time History of Events and Macroscale Interactions during Substorms (THEMIS) probes at down-tail distances X ∼ 7.6 to ∼17.6 RE for ∼10 min during an interval of successive substorm intensification in a storm time on 9 March 2008. The flows …
Particle Acceleration and Propagation in Strong Flares without Major Solar Energetic Particle Events
Klein, K. -L.; Malandraki, O.; Trottet, G. +1 more
Solar energetic particles (SEPs) detected in space are statistically associated with flares and coronal mass ejections (CMEs). But it is not clear how these processes actually contribute to the acceleration and transport of the particles. The present work addresses the question why flares accompanied by intense soft X-ray bursts may not produce SE…
One-dimensional Modeling for Temperature-dependent Upflow in the Dimming Region Observed by Hinode/EUV Imaging Spectrometer
Shimizu, T.; Hara, H.; Watanabe, T. +4 more
We previously found a temperature-dependent upflow in the dimming region following a coronal mass ejection observed by the Hinode EUV Imaging Spectrometer (EIS). In this paper, we reanalyzed the observations along with previous work on this event and provided boundary conditions for modeling. We found that the intensity in the dimming region drama…
Broad iron emission lines in Seyfert galaxies - re-condensation of gas onto an inner disk below the ADAF?
Meyer, F.; Meyer-Hofmeister, E.
Context. The number of strong iron Kα line detections in Seyfert AGN is clearly growing in the Chandra, XMM-Newton and Suzaku era. The iron emission lines are broad, some are relativistically blurred. These relativistic disk lines have also been observed for galactic black hole X-ray binaries. Thermal components found in hard spectra we…
Enhancement of Terrestrial Diffuse X-Ray Emission Associated with Coronal Mass Ejection and Geomagnetic Storm
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ohashi, Takaya +4 more
We present an analysis of a Suzaku observations taken during the geomagnetic storm of 2005 August 23-24. We found a time variation of diffuse soft X-ray emission when a coronal mass ejection hit Earth and caused a geomagnetic storm. The diffuse emission consisted of fluorescent scattering of solar X-rays and an exospheric solar wind charge exchang…
Testing a Scale-independent Method to Measure the Mass of Black Holes
Titarchuk, L.; Satyapal, S.; Gliozzi, M. +2 more
Estimating the black hole mass at the center of galaxies is a fundamental step not only for understanding the physics of accretion, but also for the cosmological evolution of galaxies. Recently, a new method, based solely on X-ray data, was successfully applied to determine the black hole mass in Galactic systems. Since X-rays are thought to be pr…
Resolution of the lunar hydrogen enigma
Hodges, R. R.
The recent discovery, by instruments on the IBEX and Chandrayaan-1 spacecraft, of significant fluxes of energetic hydrogen atoms escaping from the moon suggests that there are flaws in the common wisdom regarding the interaction of solar wind with lunar regolith that have prevailed in attempts to explain the failure of the Apollo 17 far-ultraviole…
Geomorphologic mapping of the Menrva region of Titan using Cassini RADAR data
Lopes, Rosaly M. C.; Williams, David A.; Radebaugh, Jani +1 more
We made a detailed geomorphologic map of the Menrva region of Titan, using Cassini RADAR data as our map base. Using similar techniques and approaches that were applied to mapping Magellan radar images of Venus, and earlier, more generalized Titan maps, we were able to define and characterize 10 radar morphologic units, along with inferred dunes a…
Suzaku Observation of the Intermediate Polar V1223 Sagittarii
Ishida, Manabu; Hayashi, Takayuki; Terada, Yukikatsu +2 more
We report on the Suzaku observation of the intermediate polar V1223 Sagittarii. Using a multi-temperature plasma emission model with its reflection from a cold matter, we obtained the shock temperature to be 37.9