Search Publications
New near-IR observations of mesospheric CO2 and H2O clouds on Mars
Bibring, Jean-Pierre; Gondet, Brigitte; Vincendon, Mathieu +2 more
Carbon dioxide clouds, which are speculated by models on solar and extra-solar planets, have been recently observed near the equator of Mars. The most comprehensive identification of Martian CO2 ice clouds has been obtained by the near-IR imaging spectrometer OMEGA. CRISM, a similar instrument with a higher spatial resolution, cannot de…
Remote compositional analysis of lunar olivine-rich lithologies with Moon Mineralogy Mapper (M3) spectra
Mustard, John F.; Clark, Roger N.; Head, James W. +10 more
A systematic approach for deconvolving remotely sensed lunar olivine-rich visible to near-infrared (VNIR) reflectance spectra with the Modified Gaussian Model (MGM) is evaluated with Chandrayaan-1 Moon Mineralogy Mapper (M3) spectra. Whereas earlier studies of laboratory reflectance spectra focused only on complications due to chromite …
Comparison of Observations at ACE and Ulysses with Enlil Model Results: Stream Interaction Regions During Carrington Rotations 2016 - 2018
Luhmann, J. G.; Russell, C. T.; Jian, L. K. +6 more
During the latitudinal alignment in 2004, ACE and Ulysses encountered two stream interaction regions (SIRs) each Carrington rotation from 2016 to 2018, at 1 and 5.4 AU, respectively. More SIR-driven shocks were observed at 5.4 AU than at 1 AU. Three small SIRs at 1 AU merged to form a strong SIR at 5.4 AU. We compare the Enlil model results with s…
Earthward plasma sheet flows during substorm phases
Snekvik, K.; Juusola, L.; Tanskanen, E. +2 more
Magnetic reconnection in the Earth's magnetotail converts open magnetic flux to closed, producing fast flows in the plasma sheet. Earthward fast flows can thus be used as a proxy for energy and momentum transfer into the closed magnetosphere during the course of a substorm. Characteristics of flows observed before substorm onset can provide inform…
Temperature Distribution of a Non-flaring Active Region from Simultaneous Hinode XRT and EIS Observations
DeLuca, Edward E.; Landi, Enrico; Testa, Paola +2 more
We analyze coordinated Hinode X-ray Telescope (XRT) and Extreme Ultraviolet Imaging Spectrometer (EIS) observations of a non-flaring active region to investigate the thermal properties of coronal plasma taking advantage of the complementary diagnostics provided by the two instruments. In particular, we want to explore the presence of hot plasma in…
Plasma Heating During a Coronal Mass Ejection Observed By the Solar and Heliospheric Observatory
Raymond, J. C.; Korreck, K. E.; Murphy, N. A.
We perform a time-dependent ionization analysis to constrain plasma heating requirements during a fast partial halo coronal mass ejection (CME) observed on 2000 June 28 by the Ultraviolet Coronagraph Spectrometer (UVCS) aboard the Solar and Heliospheric Observatory (SOHO). We use two methods to derive densities from the UVCS measurements, includin…
The North American and Pelican Nebulae. II. MIPS Observations and Analysis
Stapelfeldt, K. R.; Guieu, S.; Carpenter, J. M. +9 more
We present observations of ~7 deg2 of the North American and Pelican Nebulae region at 24, 70, and 160 µm with the Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS). We incorporate the MIPS observations with earlier Spitzer Infrared Array Camera (IRAC) observations, as well as archival near-infrared (IR) and …
Tidal dynamical considerations constrain the state of an ocean on Enceladus
Tyler, R.
In previous work, solutions to the non-dissipative Laplace Tidal Equations (LTE) were used to provide bounds on the heat generated by the response of a subsurface ocean on Enceladus to an obliquity component of tidal forces. Here we improve these bounds using solutions from the LTE with a generic dissipation term explicitly added. We find solution…
New Optical/Ultraviolet Counterparts and the Spectral Energy Distributions of Nearby, Thermally Emitting, Isolated Neutron Stars
van Kerkwijk, M. H.; Kaplan, D. L.; Ho, W. C. G. +1 more
We present Hubble Space Telescope optical and ultraviolet photometry for five nearby, thermally emitting neutron stars. With these measurements, all seven such objects have confirmed optical and ultraviolet counterparts. Combining our data with archival space-based photometry, we present spectral energy distributions for all sources and measure th…
Correlation and Taylor scale variability in the interplanetary magnetic field fluctuations as a function of solar wind speed
Dasso, S.; Matthaeus, W. H.; Weygand, James M. +1 more
Simultaneous multiple point measurements of the magnetic field from 11 spacecraft are employed to determine the correlation scale and the magnetic Taylor microscale of the solar wind as functions of the mean magnetic field direction and solar wind speed. We find that the Taylor scale is independent of direction relative to the mean magnetic field …