Search Publications
An investigation into potential causes of the anomalistic feature observed by the Rosetta Alice spectrograph around 67P/Churyumov-Gerasimenko
Parker, Joel Wm.; Stern, S. Alan; Noonan, John +6 more
The Alice far-ultraviolet spectrograph in operation around the comet 67P/Churyumov-Gerasimenko on the Rosetta spacecraft experiences an anomalistic feature (AF) that is ubiquitous at comet separations less than 450 km. This feature is highly temporally variable and displays no relation to any studied parameters with the exception of comet separati…
Comets at radio wavelengths
Bockelée-Morvan, Dominique; Biver, Nicolas; Crovisier, Jacques +1 more
Comets are considered as the most primitive objects in the Solar System. Their composition provides information on the composition of the primitive solar nebula, 4.6 Gyr ago. The radio domain is a privileged tool to study the composition of cometary ices. Observations of the OH radical at 18 cm wavelength allow us to measure the water production r…
Near-infrared observations of PSR J1357-6429
Mennickent, R. E.; Zharikov, S.; Kirichenko, A. +3 more
PSR J1357-6429 is a young radio pulsar that has been detected in the X-ray and γ-ray bands. We present high spatial resolution near-infrared imaging of the pulsar field in the J, H and Ks bands obtained using the VLT/NaCo with the Adaptive Optic system. We found a faint source at the most precise pulsar radio position, which we propose …
The Intermediate-mass Star-forming Region Lynds 1340. An Optical View
Moór, Attila; Kun, Mária; Reipurth, Bo +1 more
We have performed an optical spectroscopic and photometric search for young stellar objects associated with the molecular cloud Lynds 1340, and examined the structure of the cloud by constructing an extinction map, based on SDSS data. The new extinction map suggests a shallow, strongly fragmented cloud, having a mass of some 3700 M ⊙. L…
Saturn's aurora observed by the Cassini camera at visible wavelengths
Dyudina, Ulyana A.; Ingersoll, Andrew P.; Ewald, Shawn P. +1 more
The first observations of Saturn's visible-wavelength aurora were made by the Cassini camera. The aurora was observed between 2006 and 2013 in the northern and southern hemispheres. The color of the aurora changes from pink at a few hundred km above the horizon to purple at 1000-1500 km above the horizon. The spectrum observed in 9 filters spannin…
The causal sequence investigation of the ring current ion-flux increasing and the magnetotail ion injection during a major storm
Cao, JinBin; Li, Lu; McKenna-Lawlor, S. +2 more
Comprehensive records are available in ENA data of ring current activity recorded by the NUADU instrument aboard TC-2 on 15 May, 2005 during a major magnetic storm (which incorporated a series of substorms). Ion fluxes at 4-min temporal resolution derived from ENA data in the energy ranges 50-81 and 81-158 keV are compared with in situ particle fl…
Monitoring Observatinos of H2O and SiO Masers Toward Post-AGB Stars
Kim, Jaeheon; Cho, Se-Hyung; Yoon, Dong-Hwan
The role of ionospheric O+ outflow in the generation of earthward propagating plasmoids
Lyon, J. G.; Zhang, B.; Ouellette, J. E. +2 more
Earthward propagating plasmoids in the Earth's magnetotail have been observed by satellites. Using a multifluid global magnetosphere simulation, earthward propagating plasmoids are reproduced when ionospheric O+ outflow is included in the global simulation. Controlled simulations show that without ionospheric outflow, the plasmoids gene…
Phase relations between total solar irradiance and the Mg II index
Li, K. J.; Xu, J. C.; Feng, W. +1 more
The Mg II index is usually used to represent the brightening contribution to total solar irradiance (TSI) by solar bright structures, such as faculae and network. In order to understand variations of TSI, phase relations of TSI and the chromospheric Mg II index is investigated on time-scales of one year and longer. The NOAA daily Mg II index at th…
Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
Iwasawa, K.; Fabian, A. C.; Reynolds, C. S. +3 more
We report on strong X-ray variability and the Fe K-band spectrum of the Seyfert galaxy IRAS 18325-5926 obtained from the 2001 XMM-Newton EPIC pn observation with a duration of ~120 ks. While the X-ray source is highly variable, the 8-10 keV band shows larger variability than that of the lower energies. Amplified 8-10 keV flux variations are associ…