Search Publications
Mapping of the quasi-periodic oscillations at the flank magnetopause into the ionosphere
Nykyri, K.; Moore, T. W.; Dougal, E. R.
We have estimated the ionospheric location, area, and travel time of quasi-periodic oscillations originating from the magnetospheric flanks. This was accomplished by utilizing global and local MHD models and Tsyganenko semi-empirical magnetic field model on multiple published and four new cases believed to be caused by the Kelvin-Helmholtz Instabi…
Registration of Mars remote sensing images under the crater constraint
Cheng, Liang; Ma, Lei; Yang, Kang +2 more
Registration of Mars remote sensing images is vital to jointly exploit and integrate the data from various sensors and periods, which is difficult because the lack of textural information in Mars images. We proposed a RANSAC-based iterative method, under the crater constraint, for affine invariant feature matching. The novelty of this method is, i…
Radial evolution of the three-dimensional structure in CIRs between Earth and Ulysses
Desai, M. I.; Broiles, T. W.; Lee, C. O. +1 more
The radial alignment of ACE and Ulysses in February 2004 and August 2007 provided us with unprecedented opportunities to study the radial evolution of planar magnetic structures (PMSs) in three corotating interaction regions (CIRs). The in situ observations are compared with results from an analytical and a numerical model of CIRs. We find that (1…
Large size scatter of passively evolving lensed galaxies at z ~ 2 in CLASH.
Lin, L.; Chen, Y.; Kong, X. +3 more
In a systematic search over 11 cluster fields from Cluster Lensing And Supernova survey with Hubble (CLASH), we identify 10 passively evolving massive galaxies at redshift z ∼ 2. We derive the stellar properties of these galaxies using Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3)/Advanced Camera for Surveys (ACS) multiband data, togethe…
X-Ray Observation of the Galactic Supernova Remnant G355.6-0.0 with Suzaku
Koyama, Katsuji; Ota, Naomi; Yamauchi, Shigeo +1 more
We present results of the Galactic supernova remnant (SNR) G355.6-0.0 observed with Suzaku. We resolved diffuse emission detected with ASCA into two objects, G355.6-0.0 and a point-like source, Suzaku J173530-3236. The X-ray emission from G355.6-0.0 exhibits a center-filled morphology within the radio shell. The X-ray spectrum is well-represented …
Universal scaling laws for fully-developed magnetic field turbulence near and far upstream of the Earth's bow shock
Miranda, Rodrigo A.; Chian, Abraham C. -L.; Rempel, Erico L.
We analyze the multifractal scaling of the modulus of the interplanetary magnetic field near and far upstream of the Earth's bow shock, measured by Cluster and ACE, respectively, from 1 to 3 February 2002. The maximum order of the structure function is carefully estimated for each time series using two different techniques, to ensure the validity …
Developments, characterization and proton irradiation damage tests of AlN detectors for VUV solar observations
Gissot, S.; Saito, T.; BenMoussa, A. +8 more
For next generation spaceborne solar ultraviolet radiometers, innovative metal-semiconductor-metal detectors based on wurtzite aluminum nitride are being developed and characterized. A set of measurement campaigns and proton irradiation damage tests was carried out to obtain their ultraviolet-to-visible characterization and degradation mechanisms.…
Does the Oosterhoff Dichotomy Exist in the Andromeda Galaxy? I. The Case of G11
Kinemuchi, Karen; Marconi, Marcella; Fiorentino, Giuliana +8 more
We present the first evidence that Oosterhoff type II globular clusters exist in the Andromeda galaxy (M31). On the basis of time-series photometry of the moderately metal-poor ([Fe/H] ~-1.6 dex) M31 globular cluster G11, obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we detected and derived periods for 14 RR …
Evidence of Hot High Velocity Photoionized Plasma Falling on Actively Accreting T Tauri Stars
Gómez de Castro, Ana Ines
The He II (1640 Å) line and the resonance doublet of N V (UV1) provide a good diagnostic tool to constrain the excitation mechanism of hot (Te > 40,000 K) atmospheric/magnetospheric plasmas in T Tauri stars (TTSs). Making use of the data available in the Hubble Space Telescope archive, this work shows that there are at least two dist…
Impulsive Thermal X-Ray Emission from a Low-lying Coronal Loop
Fletcher, Lyndsay; Li, Youping; Liu, Siming
Understanding the relationship among different emission components plays an essential role in the study of particle acceleration and energy conversion in solar flares. In flares where gradual and impulsive emission components can be readily identified, the impulsive emission has been attributed to non-thermal particles. We carry out detailed analy…