Search Publications
Pan-Chromatic Observations of the Remarkable Nova Large Magellanic Cloud 2012
Walter, Frederick M.; Drake, Jeremy J.; Woodward, Charles E. +9 more
We present the results of an intensive multiwavelength campaign on nova LMC 2012. This nova evolved very rapidly in all observed wavelengths. The time to fall two magnitudes in the V band was only 2 days. In X-rays the super soft phase began 13 ± 5 days after discovery and ended around day 50 after discovery. During the super soft phase, the Swift…
On Extreme-ultraviolet Helium Line Intensity Enhancement Factors on the Sun
Curdt, W.; Fludra, A.; Lanzafame, A. C. +3 more
Helium lines in the solar EUV spectrum provide useful diagnostics of the solar atmosphere plasma. Helium is one of the few elements that exhibits strong emission lines formed in the lower transition region, and it is the second most abundant element in the Sun. However, the analysis of helium lines is complicated by their optical thickness and the…
Solar zenith angle-dependent asymmetries in Venusian bow shock location revealed by Venus Express
Zhang, Tielong; Rong, Zhaojin; Futaana, Yoshifumi +8 more
It has been long known that the Venusian bow shock (BS) location is asymmetric from the observations of the long-lived Pioneer Venus Orbiter mission. The Venus Express (VEX) mission crossed BS near perpendicularly not only in the terminator region but also in the near-subsolar and tail regions. Taking the advantage of VEX orbit geometry, we examin…
Nonlinear MHD Waves in a Prominence Foot
Schmieder, B.; Ofman, L.; Kucera, T. +1 more
We study nonlinear waves in a prominence foot using a 2.5D MHD model motivated by recent high-resolution observations with Hinode/Solar Optical Telescope in Ca ii emission of a prominence on 2012 October 10 showing highly dynamic small-scale motions in the prominence material. Observations of Hα intensities and of Doppler shifts show similar propa…
Evidence for a seasonally dependent ring plasma in the region between Saturn's A Ring and Enceladus' orbit
Gurnett, D. A.; Persoon, A. M.; Kurth, W. S. +2 more
Equatorial electron density measurements from the Cassini Radio and Plasma Wave Science experiment are derived from the upper hybrid resonance frequency from Saturn Orbit Insertion (SOI) on 1 July 2004 through 21 May 2013. These densities are used to determine the characteristics of the plasma in the inner magnetosphere of Saturn between the outer…
Investigation on Radio-Quiet and Radio-Loud Fast CMEs and Their Associated Flares During Solar Cycles 23 and 24
Shanmugaraju, A.; Suresh, K.
We present the results of a detailed analysis on the differences between radio-loud (RL) and radio-quiet (RQ) fast coronal mass ejections (CMEs) (V≥900 km s−1) observed during the period 1996 - 2012. The analysis consists of three different steps in which we examined the properties of (i) RL and RQ CMEs, (ii) accelerating (class-A) and …
Coma dust scattering concepts applied to the Rosetta mission
Fink, Uwe; Rinaldi, Giovanna
This paper describes basic concepts, as well as providing a framework, for the interpretation of the light scattered by the dust in a cometary coma as observed by instruments on a spacecraft such as Rosetta. It is shown that the expected optical depths are small enough that single scattering can be applied. Each of the quantities that contribute t…
A Method for the Estimation of p-Mode Parameters from Averaged Solar Oscillation Power Spectra
Kosovichev, A. G.; Scherrer, P. H.; Larson, T. P. +3 more
A new fitting methodology is presented that is equally well suited for the estimation of low-, medium-, and high-degree mode parameters from m-averaged solar oscillation power spectra of widely differing spectral resolution. This method, which we call the “Windowed, MuLTiple-Peak, averaged-spectrum” or WMLTP Method, constructs a theoretical profil…
Investigation of the Geoeffectiveness of CMEs Associated with IP Type II Radio Bursts
Chen, Y.; Kong, X. L.; Wang, B. +1 more
We perform a statistical analysis of the geoeffectiveness of coronal mass ejections (CMEs) that are associated with interplanetary (IP) type II bursts in Solar Cycle 23 during the period 1997 - 2008. About 47 % (109 out of 232) of IP type II bursts are found to be associated with geomagnetic storms. Of these 47 %, 27 % are associated with moderate…
Solar Radius Variations: An Inquisitive Wavelength Dependence
Kilcik, Ali; Kosovichev, Alexander; Rozelot, Jean Pierre
Recent solar radius determinations from space observations of Mercury and Venus transits have been made by different teams in 2003, 2006, 2012, and 2014. Seemingly the results are not consistent: the authors interpreted the discrepancies as caused by the different methods of analysis. However, looking at the wavelength dependence and adding other …