Zobrazeno 1 - 10
of 114
pro vyhledávání: '"Spangler, Steven R."'
Autor:
Spangler, Steven R.
Vorticity is central to the nature of, and dynamical processes in turbulence, including turbulence in astrophysical fluids. The results of \cite{Raymond20a,Raymond20b} on vorticity in the post-shock fluid of the Cygnus Loop supernova remnant are ther
Externí odkaz:
http://arxiv.org/abs/2209.06707
Autor:
Spangler, Steven R.
Much of the information about the magnetic field in the Milky Way and other galaxies comes from measurements which are path integrals, such as Faraday rotation and the polarization of synchrotron radiation of cosmic ray electrons. The measurement mad
Externí odkaz:
http://arxiv.org/abs/2101.01118
When comparing nebular electron densities derived from collisionally excited lines (CELs) to those estimated using the emission measure, significant discrepancies are common. The standard solution is to view nebulae as aggregates of dense regions of
Externí odkaz:
http://arxiv.org/abs/1912.05542
An analytic calculation is made of the effect of plasma density fluctuations on some spectroscopic diagnostics commonly used in the study of HII regions and planetary nebulae. To permit an analytic treatment, attention is restricted to the case of de
Externí odkaz:
http://arxiv.org/abs/1910.08466
Autor:
Costa, Allison H., Spangler, Steven R.
We utilized the Very Large Array to make multifrequency polarization measurements of 20 radio sources viewed through the IC 1805 HII region and "Superbubble", as well as in the immediate vicinity. The measurements at frequencies between 4.33 and 7.76
Externí odkaz:
http://arxiv.org/abs/1803.02878
Coronal mass ejections (CMEs) are large-scale eruptions of plasma from the Sun that play an important role in space weather. Faraday rotation (FR) is the rotation of the plane of polarization that results when a linearly polarized signal passes throu
Externí odkaz:
http://arxiv.org/abs/1611.01445
We report Faraday rotation measurements of 11 extragalactic radio sources with lines of sight through the Rosette Nebula, a prominent HII region associated with the star cluster NGC 2244. It is also a prototypical example of a "stellar bubble" produc
Externí odkaz:
http://arxiv.org/abs/1510.04664
Many competing models for the coronal heating and acceleration mechanisms of the high-speed solar wind depend on the solar magnetic field and plasma structure in the corona within heliocentric distances of $5R_\odot$. We report on sensitive VLA full-
Externí odkaz:
http://arxiv.org/abs/1307.1727
We discuss the degree to which radio propagation measurements diagnose conditions in the ionized gas of the interstellar medium (ISM). The "signal generators" of the radio waves of interest are extragalactic radio sources (quasars and radio galaxies)
Externí odkaz:
http://arxiv.org/abs/1304.1735
We report the results of Faraday rotation measurements of 23 background radio sources whose lines of sight pass through or close to the Rosette Nebula. The Rosette Nebula is an excellent candidate for studies of super bubbles associated with young st
Externí odkaz:
http://arxiv.org/abs/1206.5173