In this work we consider the rich spectrum of fast MHD modes in low-beta, line-tied coronal loops (standing and leaky). One of the most important conclusions is that in a straight and homogeneous cylindrical flux tube there should be observational signatures of the excitation of higher order harmonics. Nevertheless, our results indicate that these

Bars drive the dynamical evolution of disk galaxies by redistributing mass and angular momentum, and they are ubiquitous in present-day spirals. Early studies of the Hubble Deep Field reported a dramatic decline in the rest-frame optical bar fraction f_opt to below 5% at redshifts z>0.7, implying that disks at these epochs are fundamentally

The ELAIS Deep X-ray Survey (EDXS) is being conducted in the northern ELAIS regions N1 and N2. The Chandra data consist of approximately 75 ks exposures in each field. Region N1 was observed on 2000 August 3-4 (OBSID 888) and N2 on 2000 August 2-3 (OBSID 887). The nominal aimpoints were: N1, 16:10:20.11 +54:33:22.3; and N2, 16:36:46.99 +41:01:33.7

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The magnetohydrodynamic (MHD) normal modes of oscillation of sheared coronal arcades including longitudinal wave propagation are studied. Solutions have been computed in order to ascertain the effects of the longitudinal magnetic field component, By, and of the longitudinal propagation, ky in these structures. Our results show that whenever By = 0