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Elemental Abundances in the Solar Upper Atmosphere Derived by Spectroscopic Means

Feldman, U.; Widing, K. G.

The composition of the solar photosphere is believed to be uniform. Indeed a quantity that does not vary with solar surface location or with a particular solar feature, i.e., no observational evidence is available to indicate that the photospheric composition near the solar equator is different from the photospheric composition near the solar pole…

Reconstructed 3-d magnetic field structure and hard X-ray two ribbons for 2000 Bastille-day event

Yan, Yihua; Huang, Guangli

The Bastille-day event in 2000 produced energetic 3B/X5.6 flare with a halo CME, which had great geo-effects consequently. This event has been studied extensively and it is considered that it follows the two-ribbon flare model. The flare/CME event was triggered by an erupting filament and TRACE observations showed formation of giant arcade structu…

Variations of the magnetic fields in large solar flares

Donea, A. -C.; Schunker, H.

We present preliminary results from high resolution observations obtained with the Michelson Doppler Imager (MDI) instrument on the SOHO of two large solar flares of 14 July 2000 and 24 November 2000. We show that rapid variations of the line-of-sight magnetic field occured on a time scale of a few minutes during the flare explosions. The reversib…

Telescopic and Microscopic views of the magnetosphere: Multispacecraft observations

Baker, D. N.

The magnetospheric research community has long sought the capability to view the Sun-Earth system in a global way and to probe concurrently the microphysical details of key physical regions. This objective has now been substantially realized with the combination of the CLUSTER and IMAGE missions. With the additional use of SOHO, ACE, FAST, SAMPEX,…