Search Publications
High-resolution 3-µm spectra of Jupiter: Latitudinal spectral variations influenced by molecules, clouds, and haze
Geballe, T. R.; Minh, Y. C.; Seo, H. J. +3 more
We present latitudinally-resolved high-resolution ( R = 37,000) pole-to-pole spectra of Jupiter in various narrow longitudinal ranges, in spectral intervals covering roughly half of the spectral range 2.86-3.53 µm. We have analyzed the data with the aid of synthetic spectra generated from a model jovian atmosphere that included lines of CH <…
Solar Wind Speed And Temperature Relationship
Matthaeus, William H.; McComas, David J.; Henney, Carl J. +1 more
Previous studies of solar wind proton temperature and speed have found a break in the curve between 400 and 550 km/s. Examining all the OMNI 2 data from 1965 to 2009, we create plots binned in both temperature and speed in order to identify where the majority of the points lie. Using yearly color plots to evaluate the curve shape we find most of t…
On the multispacecraft determination of periodic surface wave phase speeds and wavelengths
Farrugia, C. J.; Fazakerley, A. N.; Owen, C. J. +3 more
Observations of surface waves on the magnetopause indicate a wide range of phase velocities and wavelengths. Their multispacecraft analysis allows a more precise determination of wave characteristics than ever before and reveal shortcomings of approximations to the phase speed that take a predetermined fraction of the magnetosheath speed or the av…
On the Estimate of Magnetic Non-potentiality of Sunspots Derived Using Hinode SOT/SP Observations: Effect of Polarimetric Noise
Gosain, Sanjay; Tiwari, Sanjiv Kumar; Venkatakrishnan, P.
The accuracy of Milne-Eddington (ME) inversions, used to retrieve the magnetic field vector, depends upon the signal-to-noise ratio (S/N) of the spectro-polarimetric observations. The S/N in real observations varies from pixel to pixel; therefore the accuracy of the field vector also varies over the map. The aim of this work is to study the effect…
Spiky Fine Structure of Type III-like Radio Bursts in Absorption
Yan, Y. H.; Fu, Q. J.; Chen, B. +2 more
An uncommon fine structure in the radio spectrum consisting of bursts in absorption was observed with the Chinese Solar Broadband Radiospectrometer (SBRS) in the frequency range of 2.6 - 3.8 GHz during an X3.4/4B flare on 13 December 2006 in active region NOAA 10930 (S05W33). Usual fine structures in emission such as spikes, zebra stripes, and dri…
Observations and simulations of a highly structured plasma sheet during northward IMF
El-Alaoui, Mostafa; Ashour-Abdalla, Maha; Walker, Raymond +2 more
We investigated a highly structured plasma sheet populated by counterstreaming beams observed by the Cluster and Double Star spacecraft on October 10, 2005, during an extended interval of northward interplanetary magnetic field (IMF). We used Wind spacecraft observations as input into our global magnetohydrodynamic (MHD) simulation of the event, a…
Energetic Relations between the Disappearing Solar Filaments and the Associated Flare Arcades
Shibata, Kazunari; Morimoto, Taro; Kurokawa, Hiroki +1 more
We present the temporal and statistical relations between the mechanical energies of disappearing solar filaments and the thermal energies of the associated flare arcades in soft X-rays. Measuring the 3-D velocity fields of 10 eruptive filaments, we calculated their mechanical energy gain rate, ɛmc, per unit volume and compared it to th…
Abundance Patterns in the Interstellar Medium of the S0 Galaxy NGC 1316 (Fornax A) Revealed with Suzaku
Makishima, Kazuo; Tashiro, Makoto S.; Matsushita, Kyoko +3 more
The Suzaku X-ray satellite observed the nearby S0 galaxy NGC 1316, a merger remnant aged 3 Gyr. The total good exposure time was 48.7 ks. The spectra were well represented by a two-temperature thermal model for the interstellar medium (ISM) plus a power-law model. The cool and hot temperatures of the thermal model were 0.48±0.03 and 0.92±0.04 keV,…
On the success rate of the farside seismic imaging of active regions
Scherrer, P. H.; Hill, F.; Braun, D. C. +2 more
Seismic maps of the nonvisible side of the Sun (farside) have been used for almost a decade to follow large active regions before they rotate to face the Earth. Preliminary efforts to quantify the success rate of the technique (seismic holography) have been published with Michelson Doppler Imager (MDI) data. In this paper we present a thorough sta…
Properties of active galactic star-forming regions probed by imaging spectroscopy with the Fourier transform spectrometer (FTS) onboard AKARI
Takahashi, H.; Nakagawa, T.; Okada, Y. +8 more
Aims: We investigate the structure of the interstellar medium (ISM) and identify the location of possible embedded excitation sources from far-infrared (FIR) line and mid-infrared continuum emission maps.
Methods: We carried out imaging spectroscopic observations of four giant Galactic star-forming regions with the Fourier transform spec…