Search Publications
Application of a new phenomenological coronal mass ejection model to space weather forecasting
Tappin, S. J.; Howard, T. A.
Recent work by the authors has produced a new phenomenological model for coronal mass ejections (CMEs). This model, called the Tappin-Howard (TH) Model, takes advantage of the breakdown of geometrical linearity when CMEs are observed by white-light imagers at large distances from the Sun. The model extracts 3-D structure and kinematic information …
Apparent high metallicity in 3-4 keV galaxy clusters: the inverse iron-bias in action in the case of the merging cluster Abell 2028
Gastaldello, F.; Ghizzardi, S.; Tozzi, P. +6 more
Context. Recent work based on a global measurement of the ICM properties finds evidence for an increase in the iron abundance in galaxy clusters with temperatures around 2-4 keV up to a value about 3 times higher than is typical of very hot clusters ZFe ≃ 0.25 Z_⊙.
Aims: We have started a study of the metal distribution in nearby X…
The effect of internal inhomogeneity on the activity of comet nuclei - Application to Comet 67P/Churyumov-Gerasimenko
Rosenberg, Eric D.; Prialnik, Dina
We present thermal evolution calculations of inhomogeneous asymmetric initial configurations of a spherical model of Comet 67P/Churyumov-Gerasimenko, using a fully 3-dimensional numerical code. The initial composition is amorphous H 2O ice and dust, in a "layered-pile" configuration, where layers differing in ice/dust ratio and thermal …
Characterization of horizontal flows around solar pores from high-resolution time series of images
Martínez Pillet, V.; Vargas Domínguez, S.; Bonet, J. A. +1 more
Context. Though there is increasing evidence linking the moat flow and the Evershed flow along the penumbral filaments, there is not a clear consensus regarding the existence of a moat flow around umbral cores and pores, and the debate is still open. Solar pores appear to be a suitable scenario to test the moat-penumbra relation as they correspond…
Identification of Two Bright z > 3 Submillimeter Galaxy Candidates in the COSMOS Field
Capak, P.; Espada, D.; Fazio, G. G. +5 more
We present high-resolution interferometric Submillimeter Array imaging at 890 µm (~2'' resolution) of two millimeter selected galaxies—MMJ100015+021549 and MMJ100047+021021—discovered with the Max-Planck Millimeter Bolometer (MAMBO) on the IRAM 30 m telescope and also detected with Bolocam on the CSO, in the COSMOS field. The first source is…
Global magnetohydrodynamic simulation of reconnection and turbulence in the plasma sheet
Goldstein, Melvyn L.; El-Alaoui, Mostafa; Walker, Raymond J. +3 more
Plasma sheet turbulence is examined by using a global MHD simulation. The simulation used idealized purely southward interplanetary magnetic field (IMF) driving conditions to eliminate the effect of solar wind and IMF variations. The results were compared with spacecraft observations of turbulence by computing power spectral densities and probabil…
Interplanetary Coronal Mass Ejections Observed by Ulysses Through Its Three Solar Orbits
Du, D.; Zhang, X. X.; Zuo, P. B.
An extended Ulysses interplanetary coronal mass ejections (ICMEs) list is used to statistically study the occurrence rate of ICMEs, the interaction of ICMEs with solar wind, and the magnetic field properties in ICMEs. About 43% of the ICMEs are identified as magnetic clouds (MCs). It is found that the occurrence rate of ICMEs approximately follows…
The 400d Galaxy Cluster Survey weak lensing programme. I. MMT/Megacam analysis of CL0030+2618 at z = 0.50
Zhang, Y. -Y.; Vikhlinin, A.; Sarazin, C. L. +7 more
Context. Studying cosmological structure formation provides insights into all of the universe's components: baryonic matter, dark matter, and, notably, dark energy. Measuring the mass function of galaxy clusters at high redshifts is particularly useful probe for both learning about the history of structure formation and constraining cosmological p…
Spectral Irradiance Calibration in the Infrared. XVII. Zero-magnitude Broadband Flux Reference for Visible-to-infrared Photometry
Kraemer, Kathleen E.; Price, Stephan D.; Engelke, Charles W.
The absolutely calibrated infrared (IR) stellar spectra of standard stars described by Engelke et al. are being extended into the visible and will span a continuous wavelength range from ~0.35 µm to 35.0 µm. This paper, which is a continuation of the series on calibration initiated with Cohen et al., presents the foundation of this ext…
UVIS observations of the FUV OI and CO 4P Venus dayglow during the Cassini flyby
Hubert, B.; Gladstone, G. R.; Shematovich, V. I. +4 more
We analyze FUV spatially-resolved dayglow spectra obtained at 0.37 nm resolution by the UVIS instrument during the Cassini flyby of Venus. We use a least-squares fit method to determine the brightness of the OI emissions at 130.4 and OI 135.6 nm, and of the bands of the CO fourth positive system which are dominated by fluorescence scattering. We c…