Search Publications
Highly significant detection of solar neutrons on 2005 September 7
Tanaka, Y. T.; Yoshikawa, I.; Mukai, T. +21 more
We have successfully detected solar neutrons at ground level in association with the X17.0 solar flare that occurred on 2005 September 7. Observations were made with the solar neutron telescopes and neutron monitors located in Bolivia and Mexico. In this flare, large fluxes of hard X-rays and γ-rays were observed by the GEOTAIL and the INTEGRAL sa…
Suzaku observations of cyclotron resonances in binary X-ray pulsars
Yonetoku, D.; Mihara, T.; Takahashi, H. +16 more
Since the typical magnetic field strengths of neutron stars reach 10 12 Gauss, the cyclotron resonance produced by a transition between Landau levels appears in the X-ray band. Systematic measurements of cyclotron absorption features in bright sources have been carried out extensively with Ginga, RXTE, BeppoSAX, and INTEGRAL. The cyclot…
Understanding the origin of the solar cyclic activity for an improved earth climate prediction
Turck-Chièze, Sylvaine; Lambert, Pascal
This review is dedicated to the processes which could explain the origin of the great extrema of the solar activity. We would like to reach a more suitable estimate and prediction of the temporal solar variability and its real impact on the Earth climatic models. The development of this new field is stimulated by the SoHO helioseismic measurements…
Detection of Martian dust clouds by SPICAM UV nadir measurements during the October 2005 regional dust storm
Montmessin, F.; Bertaux, J. L.; Fussen, D. +5 more
The SPICAM UV spectrometer onboard Mars Express observed two regional dust storms: on October 24, 2005, near Argyre Planitia and on July 9, 2005, in Hellas Planitia. The measurements were performed in nadir mode. The spectral domain 210-310 nm is considered. A comparison with a prior orbit which passed above almost the same path 6 days before the …
The CME-productivity associated with flares from two active regions
Gopalswamy, N.; Yashiro, S.; Akiyama, S.
We report on two flare-productive adjacent active regions (ARs), with different levels of coronal mass ejection (CME) association. AR 10039 and AR 10044 produced strong X-ray flares during their disk passages. We examined the CME association rate of X-ray flares and found it to be different between the two ARs. AR 10039 was CME-rich with 72% assoc…
The latitudinal distributions of sunspot areas and magnetic fields and their correlation with the background solar magnetic field in the cycle 23
Zharkova, V. V.; Zharkov, S. I.; Gavryuseva, E. V.
The quasi 3D latitudinal distributions (butterfly diagrams) of sunspot areas and magnetic fields obtained within the whole µ-hemispheres in longitudes from the Solar Feature Catalogues for 9 years (1996-2005) of the cycle 23 are correlated with those of the low-resolution solar magnetic fields (SMF) obtained from Wilcox Solar Observatory. Du…
A study of a macro-spicule and a transition region explosive event in a solar coronal hole
Doyle, J. G.; Xia, L. D.; Banerjee, D. +1 more
AimsSpicules and the higher macro-spicules (jet-like structures seen at the solar limb) are believed to be the dominant mechanism for mass ejection in the higher solar atmosphere outside active regions. But what is the connection between them and other small-scale structures in the Sun's atmosphere, like for example transition region explosive eve…
AKARI (ASTRO-F): Flight performance and preliminary results
Shibai, Hiroshi
ASTRO-F, which is the first Japanese satellite mission dedicated to the infrared wavelength region, was successfully launched on February 21, 2006 (UT), and was named "AKARI". The telescope has a 69 cm aperture, and is cooled to 6 K with super-fluid helium and mechanical coolers. AKARI is designed for the most advanced all-sky survey in the mid- a…
A sensor to perform in-situ thermal conductivity determination of cometary and asteroid material
Banaszkiewicz, M.; Seweryn, K.; Wawrzaszek, R.
Measurements of the physical properties of surface and subsurface layers of planetary bodies often provide important information about the structure of the medium and processes that occur there. Thermal properties of the subsurface material of cometary nuclei are crucial in determining the heat and gas transport. Similarly, asteroids' regolith is …
Development of a modular CdTe detector plane for gamma-ray burst detection below 100 keV
Barret, D.; Ehanno, M.; Amoros, C. +8 more
We report on the development of an innovative CdTe detector plane (DPIX) optimized for the detection and localization of gamma-ray bursts in the X-ray band (below 100 keV). DPIX is part of an R&D program funded by the French Space Agency (CNES). DPIX builds upon the heritage of the ISGRI instrument, currently operating with great success on th…