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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…
A statistical study on the relationship between surface field variation and CME initiation
Zhang, H. Q.; Zhang, Y.; Zhang, M.
In order to understand whether coronal mass ejections (CMEs) can be related to changes in the longitudinal photospheric magnetic field, we study 51 CME-producing active regions (ARs) which are associated with 77 halo CMEs during the period of their solar disk passage. We look at the magnetic field evolution during the short-term of 12 h before CME…
Signatures of magnetic reconnection in solar radio observations?
Aurass, Henry
Magnetic reconnection occurs during eruptive processes (flares, CMEs) in the solar corona. This leads to a change of magnetic connectivity. Nonthermal electrons propagate along the coronal magnetic field thereby exciting dm- and m-wave radio burst emission after acceleration during reconnection or other energy release processes in heights of some …
The relationship between inductive electric field and flares
Liu, J. H.; Zhang, H. Q.
We observationally deduce the inductive electric field in the photosphere for the first time from the horizontal velocities computed by local correlation tracking (LCT) technique and the vector magnetic fields derived from vector magnetograms. We study the relationship between E and powerful flares (X-class) of four active regions (ARs): NOAA 1072…
Relative fluxes of shock and prompt peaks in SEP event time profiles
Luhmann, J. G.; Mann, Adam
Peak fluxes are an important property of gradual solar energetic particle (SEP) event time profiles from both astro/heliophysical and applications perspectives. However, the peak flux in an event may occur at the event onset, or at the time of the interplanetary shock arrival (the ESP or energetic storm particles). This makes an important differen…
Magnetic coupling of the Sun Earth system The view from STEREO
Culhane, J. L.; Matthews, S. A.
The STEREO mission, launched on October 25 2006, will provide the first stereoscopic view of the Sun and its magnetic environment. A suite of identical instruments on two continuously separating spacecraft will monitor the onset of solar eruptive phenomena, and track them as the shocks and ejected material propagate through the interplanetary medi…