A5036325153- Ionosphere and magnetosphere dynamics
- Planetary Science and Exploration
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- Atmospheric aerosols and clouds
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Spaceflight effects on biology
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Space exploration and regulation
- Calibration and Measurement Techniques
- Geology and Paleoclimatology Research
- Spacecraft Design and Technology
- Spacecraft and Cryogenic Technologies
- Scientific Research and Discoveries
- Methane Hydrates and Related Phenomena
- Solar Radiation and Photovoltaics
- Space Satellite Systems and Control
- Geophysics and Sensor Technology
- Laser-induced spectroscopy and plasma
- Space Science and Extraterrestrial Life
University of Colorado Boulder
2010-2023
Laboratory for Atmospheric and Space Physics
2011-2023
University of Colorado System
2022-2023
University of Colorado Colorado Springs
2011
NSF National Center for Atmospheric Research
2005-2010
Hampton University
2001
Darmstadt University of Applied Sciences
1976
The cloud imaging and particle size (CIPS) experiment is one of three instruments on board the Aeronomy Ice in Mesosphere (AIM) spacecraft that was launched into a 600 km Sun‐synchronous orbit 25 April 2007. CIPS images have shown distinct wave patterns structures polar mesospheric clouds (PMCs), around summertime mesopause region, which are qualitatively similar to seen noctilucent (NLCs) from ground‐based photographs. PMC generally considered be manifestations upward propagating...
[1] This study presents the impact of solar spectral irradiance (SSI) variability on middle atmospheric ozone over declining phase cycle 23. Two different types forcing are applied to Whole Atmosphere Community Climate Model (WACCM) simulate response between periods quiet and high activity. One scenario uses proxy reconstructions model from Naval Research Laboratory (NRLSSI), other is based SSI observations Solar Radiation Experiment (SORCE). The SORCE show 3–5 times more in ultraviolet (UV)...
Polar mesospheric clouds (PMC) routinely form in the cold summer mesopause region when water vapor condenses to ice. We use a three‐dimensional chemistry‐climate model based on Whole‐Atmosphere Community Climate Model (WACCM) with sectional microphysics from Aerosol and Radiation for Atmospheres (CARMA) study distribution characteristics of PMCs formed by heterogeneous nucleation onto meteoric smoke particles. find good agreement between these simulations cloud properties Northern Hemisphere...
The Student Nitric Oxide Explorer (SNOE) satellite has been observing Polar Mesospheric Clouds (PMCs) since 1998 and successfully measured seven PMC seasons. In the summer seasons, Ultraviolet Spectrometer (UVS) limb measurements include detections of PMCs between 80 – 90 km. SNOE observations have a significant advantage over other in that it can observe them globally each day. Because orbits earth 15 times day, daily global images brightness may be produced. Variations with 5‐day period...
Polar Mesospheric Clouds (PMCs) were observed by a limb‐scanning ultraviolet spectrometer on the Student Nitric Oxide Explorer (SNOE). Radiance profiles at 215 and 237 nm are analyzed to determine presence of clouds. Once detected, altitude brightness cloud relative background atmosphere is determined. SNOE observations provide frequency occurrence PMC as function location time for years 1998 through 2003. The show high latitudes general rise in beginning approximately 3 weeks before summer...
The Ultraviolet and Visible Spectrometer (UVVS) component of the Mercury Atmospheric Surface Composition (MASCS) on MESSENGER spacecraft characterized local-time distribution sodium exosphere over course its orbital mission. observations show that is enhanced above Mercury's cold-pole longitudes. Based previously published models we infer these regions act as nightside surface reservoirs, temporary sinks to collect atoms transported anti-sunward. reservoirs are revealed exospheric...
Abstract The response of the polar mesosphere to 11‐year solar cycle is investigated using satellite observations from 1979 2018. Solar maximum expected cause higher temperatures and lower water vapor in upper mesosphere, thus reducing amount ice mesospheric clouds (PMCs). While PMCs showed a clear anticorrelation with before roughly 2002, this absent during recent years. are controlled by temperature vapor, which were examined 1992–2018. main diminished near 68°S 68°N appears be dramatic...
Analysis and interpretation of observations from the MESSENGER spacecraft in orbit about Mercury require knowledge solar wind “forcing” parameters. We have utilized Wang‐Sheeley‐Arge (WSA)‐ENLIL modeling tool order to calculate values interplanetary magnetic field (IMF) strength ( B ), velocity V ) density n ram pressure (~ nV 2 cross‐magnetosphere electric × Alfvén Mach number M A other derived quantities relevance for wind‐magnetosphere interactions. compared upstream IMF measurements see...
Abstract For most of the orbital phase MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission, a regular search for weakly emitting or less abundant species in Mercury's exosphere resulted nondetections. However, during final Earth year emission from multiple lines manganese, aluminum, ionized calcium was detected. These observations validate detection single line third MESSENGER Mercury flyby, provide definitive confirmation weak aluminum detections ground‐based...
A combination of satellite observations is used to study the global variation polar mesospheric cloud (PMC) brightness and determine its correlation with transient dynamics. The include PMC database from Student Nitric Oxide Explorer (SNOE) measurements atmospheric temperature made by Sounding Atmosphere using Broadband Emission Radiometry (SABER) instrument onboard Thermosphere‐Ionosphere‐Mesosphere‐Energetics Dynamics (TIMED) spacecraft. analysis unique in that we have contemporaneous PMCs...
Simultaneous and common volume observations of Noctilucent Clouds (NLC) Polar Mesospheric (PMC) have been performed above the ALOMAR research station in Northern Norway (69°N, 16°E) from ground space, respectively. A detailed case study on August 5, 2008 shows that measured particle sizes T‐matrix simulations optical properties allow to combine two observation techniques. From ground, were by lidar sounding temporal evolution cloud at locations separated about 40 km, before, during after...
The effects of atmospheric gravity waves (AGWs) on Polar Mesospheric Cloud (PMC) evolution and brightness are studied using a two dimensional version the Community Aerosol Radiation Model for Atmospheres (CARMA 2D). primary objectives doing CARMA modeling AGW PMCs to address question whether AGWs can account rapid, orbit by changes in cloud structure seen overlapping regions from images Imaging Particle Size (CIPS) experiment board Aeronomy Ice Mesosphere (AIM) spacecraft. We present...
We conducted model simulations to examine how changes in concentration of radiatively active trace gases the middle atmosphere affect long‐term upper atmosphere. focused our study on impact increases carbon dioxide (CO 2 ), methane (CH 4 and water vapor (H O), decreases ozone (O 3 ) between 1983 2003. used both National Center for Atmospheric Research Whole Atmosphere Community Climate Model Thermosphere‐Ionosphere‐Mesosphere‐Electrodynamics General Circulation Model, global mean version,...
Observations by the Cloud Imaging and Particle Size (CIPS) instrument on Aeronomy of Ice in Mesosphere (AIM) satellite have demonstrated existence Polar Mesospheric (PMC) regions populated particles whose mean sizes range between 60 100 nm (radii equivalent volume spheres). It is known from numerous experiments that typical PMC particle are order 40–50 nm. Determination size CIPS accomplished measuring scattering solar radiation at various angles a spatial resolution 25 km2. In this we find...