Search Publications
Vertical structure of Jupiter's Oval BA before and after it reddened: What changed?
de Pater, Imke; Wong, Michael H.; Marcus, Philip S. +2 more
To constrain the properties of Oval BA before and after it reddened, we use Hubble methane band images from 1994 to 2009 to find that the distribution of upper tropospheric haze atop the oval and its progenitors remained unchanged, with reflectivity variations of less than 10% over this time span. We quantify measurement uncertainties and short-te…
Energetic storm particle events in coronal mass ejection-driven shocks
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +2 more
We investigate the variability in the occurrence of energetic storm particle (ESP) events associated with shocks driven by coronal mass ejections (CMEs). The interplanetary shocks were detected during the period from 1996 to 2006. First, we analyze the CME properties near the Sun. The CMEs with an ESP-producing shock are faster ($\langle$VCME…
Retrieval and tentative indentification of the 3 µm spectral feature in Titan's haze
Sicardy, B.; Courtin, R.; Sim, C. K. +5 more
Recently, an unidentified 3.3-3.4 µm feature found in the solar occultation spectra of the atmosphere of Titan observed by Cassini/VIMS was tentatively attributed to the C-H stretching mode of aliphatic hydrocarbon chains attached to large organic molecules, but without properly extracting the feature from adjacent influences of strong CH
Ice chemistry in massive young stellar objects: the role of metallicity
van Loon, J. Th.; Indebetouw, R.; Tielens, A. G. G. M. +6 more
We present the comparison of the three most important ice constituents (water, CO and CO2) in the envelopes of massive young stellar objects (YSOs), in environments of different metallicities: the Galaxy, the Large Magellanic Cloud (LMC) and, for the first time, the Small Magellanic Cloud (SMC). We present observations of water, CO and …
Understanding the Behavior of the Heliospheric Magnetic Field and the Solar Wind During the Unusual Solar Minimum Between Cycles 23 and 24
Zhao, L.; Fisk, L.
The properties of the heliospheric magnetic field and the solar wind were substantially different in the unusual solar minimum between Cycles 23 and 24: the magnetic-field strength was substantially reduced, as were the flow properties of the solar wind, such as the mass flux. Explanations for these changes are offered that do not require any subs…
Relationship between eruptions of active-region filaments and associated flares and coronal mass ejections
Yan, X. -L.; Qu, Z. -Q.; Kong, D. -F.
To better understand the dynamical process of active-region filament eruptions and associated flares and coronal mass ejections (CMEs), we carried out a statistical study of 120 events observed by Big Bear Solar Observatory (BBSO), Transition Region and Coronal Explorer (TRACE) and the Extreme-ultraviolet Imaging Telescope (EIT) on board Solar and…
Proton and hydrogen atom transport in the Martian upper atmosphere with an induced magnetic field
Barabash, S.; Futaana, Y.; Nilsson, H. +6 more
We have applied the Direct Simulation Monte Carlo method to solve the kinetic equation for the H/H+ transport in the upper Martian atmosphere. We calculate the upward H and H+ fluxes, values that can be measured, and the altitude profile of the energy deposition to be used to understand the energy balance in the Martian atmos…
Variability and Multiwavelength-detected Active Galactic Nuclei in the Goods Fields
Koo, David C.; Laird, Elise S.; Sarajedini, Vicki L. +3 more
We identify 85 variable galaxies in the GOODS North and South fields using five epochs of Hubble Space Telescope Advance Camera for Survey V-band (F606W) images spanning 6 months. The variables are identified through significant flux changes in the galaxy's nucleus and represent ~2% of the survey galaxies. With the aim of studying the active galax…
Changes in Jupiter’s zonal velocity between 1979 and 2008
de Pater, Imke; Wong, Michael H.; Marcus, Philip S. +1 more
We show that the peak velocity of Jupiter's visible-cloud-level zonal winds near 24°N (planetographic) increased from 2000 to 2008. This increase was the only change in the zonal velocity from 2000 to 2008 for latitudes between ±70° that was statistically significant and not obviously associated with visible weather. We present the first automated…
Infrared luminosity functions of AKARI Sloan Digital Sky Survey galaxies
Goto, Tomotsugu; Inami, Hanae; Nakagawa, Takao +16 more
By cross-correlating the AKARI all-sky survey in six infrared (IR) bands (9, 18, 65, 90, 140 and 160 µm) with the Sloan Digital Sky Survey (SDSS) galaxies, we identified 2357 IR galaxies with a spectroscopic redshift. This is not just one of the largest samples of local IR galaxies, but AKARI provides crucial far-IR (FIR) bands for accuratel…