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Eruption of a Multiple-Turn Helical Magnetic Flux Tube in a Large Flare: Evidence for External and Internal Reconnection That Fits the Breakout Model of Solar Magnetic Eruptions
Moore, R. L.; Gary, G. Allen
We present observations and an interpretation of a unique multiple-turn spiral flux tube eruption from active region 10030 on 2002 July 15. The TRACE C IV observations clearly show a flux tube that is helical and erupting from within a sheared magnetic field. These observations are interpreted in the context of the breakout model for magnetic fiel…
Hubble Space Telescope STIS Ultraviolet Spectral Evidence of Outflow in Extreme Narrow-Line Seyfert 1 Galaxies. I. Data and Analysis
Leighly, Karen M.; Moore, John R.
We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of two extreme narrow-line Seyfert 1 galaxies (NLS1's), IRAS 13224-3809 and 1H 0707-495. The spectra are characterized by very blue continua; broad, strongly blueshifted high-ionization lines (including C IV and N V); and narrow, symmetric intermediate- (incl…
The distance to the giant elliptical galaxy NGC 5128
Rejkuba, M.
The distance to NGC 5128, the central galaxy of the Centaurus group and the nearest giant elliptical to us, has been determined using two independent distance indicators: the Mira period-luminosity (PL) relation and the luminosity of the tip of the red giant branch (RGB). The data were taken at two different locations in the halo of NGC 5128 with …
Time-Distance Helioseismology: Noise Estimation
Birch, A. C.; Gizon, L.
As in global helioseismology, the dominant source of noise in time-distance helioseismology measurements is realization noise due to the stochastic nature of the excitation mechanism of solar oscillations. Characterizing noise is important for the interpretation and inversion of time-distance measurements. In this paper we introduce a robust defin…
XMM-Newton observations of the supernova remnant RX J1713.7-3946 and its central source
Ballet, J.; Decourchelle, A.; Giacani, E. +3 more
We present new results from the observations of the supernova remnant (SNR)
A Numerical Model of a Coronal Mass Ejection: Shock Development with Implications for the Acceleration of GeV Protons
Gombosi, T. I.; Roussev, I. I.; Lee, M. A. +3 more
The initiation and evolution of the coronal mass ejection, which occurred on 1998 May 2 in NOAA Active Region 8210, are modeled using a fully three-dimensional, global MHD code. The initial magnetic field for the model is based on magnetogram data from the Wilcox Solar Observatory, and the solar eruption is initiated by slowly evolving the boundar…
GEMS Imaging of Red-Sequence Galaxies at z~0.7: Dusty or Old?
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +13 more
We have used the 30'×30' Hubble Space Telescope image mosaic from the Galaxy Evolution from Morphology and Spectral energy distributions (GEMS) project in conjunction with the COMBO-17 deep photometric redshift survey to define a sample of nearly 1500 galaxies with 0.65<=z<=0.75. With this sample, we can study the distr…
Dynamics of solar coronal loops. II. Catastrophic cooling and high-speed downflows
Peter, H.; Hansteen, V. H.; Müller, D. A. N.
This work addresses the problem of plasma condensation and ``catastrophic cooling'' in solar coronal loops. We have carried out numerical calculations of coronal loops and find several classes of time-dependent solutions (static, periodic, irregular), depending on the spatial distribution of a temporally constant energy deposition in the loop. Dyn…
Long-Term Cosmic-Ray Modulation in the Heliosphere
Ferreira, S. E. S.; Potgieter, M. S.
A time-dependent model based on a numerical solution of Parker's transport equation is used to model the modulation of cosmic-ray protons, electrons, and helium for full 11 year and 22 year modulation cycles using a compound approach. This approach incorporates the concept of propagating diffusion barriers, increases in the heliospheric magnetic f…
The nature of the Galactic Center source IRS 13 revealed by high spatial resolution in the infrared
Rigaut, F.; Paumard, T.; Stolovy, S. R. +1 more
High spatial resolution observations in the 1 to 3.5 µm/ region of the Galactic Center source known historically as