Search Results - "Thayer, Jeffrey"

Solar Flux Dependence of Upper Thermosphere Diurnal Variations: Observed and Modeled by Thayer, Jeffrey P., Waldron, Zachary C., Sutton, Eric K.

“…Upper thermosphere mass density over the declining phase of solar cycle 23 is investigated using a day‐to‐night ratio (DNR) of thermosphere properties to…”
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High resolution photon time-tagging lidar for atmospheric point cloud generation by Barton-Grimley, Rory A, Stillwell, Robert A, Thayer, Jeffrey P

“…The application of time-correlated single photon counting hardware and techniques to atmospheric lidar is presented. The results establish the viability of…”
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New insights into the complex interplay between drag forces and its thermospheric consequences by Hsu, Vicki W., Thayer, Jeffrey P., Wang, Wenbin, Burns, Alan

“…Drag forces, ion and viscous, are evaluated as modifiers of global wind and temperature structure in the upper thermosphere, shedding new light on their…”
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2D signal estimation for sparse distributed target photon counting data by Hayman, Matthew, Stillwell, Robert A., Carnes, Josh, Kirchhoff, Grant J., Spuler, Scott M., Thayer, Jeffrey P.

“…In this study, we explore the utilization of penalized likelihood estimation for the analysis of sparse photon counting data obtained from distributed target…”
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Impact of CIR Storms on Thermosphere Density Variability during the Solar Minimum of 2008 by Lei, Jiuhou, Thayer, Jeffrey P., Wang, Wenbin, McPherron, Robert L.

“…The solar minimum of 2008 was exceptionally quiet, with sunspot numbers at their lowest in 75 years. During this unique solar-minimum epoch, however,…”
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Wind and temperature effects on thermosphere mass density response to the November 2004 geomagnetic storm by Lei, Jiuhou, Thayer, Jeffrey P., Burns, Alan G., Lu, Gang, Deng, Yue

“…A unique conjunction of the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) and the Challenging Minisatellite Payload (CHAMP) satellites…”
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Nonmigrating tidal modulation of the equatorial thermosphere and ionosphere anomaly by Lei, Jiuhou, Thayer, Jeffrey P., Wang, Wenbin, Yue, Jia, Dou, Xiankang

“…The modulation of nonmigrating tides on both the ionospheric equatorial ionization anomaly (EIA) and the equatorial thermosphere anomaly (ETA) is investigated…”
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Ionosphere response to solar wind high-speed streams by Lei, Jiuhou, Thayer, Jeffrey P., Forbes, Jeffrey M., Wu, Qian, She, Chengli, Wan, Weixing, Wang, Wenbin

“…We present 9‐ and 7‐day periodic oscillations in the global mean Total Electron Content (TEC) from 1 January 2005 to 31 December 2006. Spectral analysis…”
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A self-consistent model of helium in the thermosphere by Sutton, Eric K., Thayer, Jeffrey P., Wang, Wenbin, Solomon, Stanley C., Liu, Xianjing, Foster, Benjamin T.

“…We have found that consideration of neutral helium as a major species leads to a more complete physics‐based modeling description of the Earth's upper…”
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Gradient calculation techniques for multi-point ionosphere/thermosphere measurements from GDC by Akbari, Hassanali, Rowland, Douglas, Coleman, Austin, Buynovskiy, Anton, Thayer, Jeffrey

“…The upcoming Geospace Dynamics Constellation (GDC) mission aims to investigate dynamic processes active in Earth’s upper atmosphere and their local, regional,…”
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Rotating solar coronal holes and periodic modulation of the upper atmosphere by Lei, Jiuhou, Thayer, Jeffrey P., Forbes, Jeffrey M., Sutton, Eric K., Nerem, R. Steven

“…We report discovery of a solar‐terrestrial connection between rotating solar coronal holes and density variations in Earth's thermosphere. Specifically, during…”
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Transition of Large‐Scale Environmental Conditions and Characteristics of Four Rainfall Types Observed by S‐PolKa During the MJO‐1 Active Phase of DYNAMO/CINDY/AMIE by Thayer, Jeffrey D., Hence, Deanna A.

“…Analyses of National Center for Atmospheric Research (NCAR) S‐PolKa dual‐polarization radar data and ERA5 reanalysis fields indicate gradual changes in…”
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Formation of the equatorial thermosphere anomaly trough: Local time and solar cycle variations by Hsu, Vicki W., Thayer, Jeffrey P., Lei, Jiuhou, Wang, Wenbin

“…This paper evaluates the formation and behavior of the equatorial thermosphere anomaly (ETA) trough in neutral temperature and mass density using the National…”
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Overcooling in the upper thermosphere during the recovery phase of the 2003 October storms by Lei, Jiuhou, Burns, Alan G., Thayer, Jeffrey P., Wang, Wenbin, Mlynczak, Martin G., Hunt, Linda A., Dou, Xiankang, Sutton, Eric

“…Infrared radiative emissions by carbon dioxide (CO2) and nitric oxide (NO) are the major cooling mechanisms of the lower thermosphere. During geomagnetically…”
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Improved cloud-phase determination of low-level liquid and mixed-phase clouds by enhanced polarimetric lidar by Stillwell, Robert A, Neely III, Ryan R, Thayer, Jeffrey P, Shupe, Matthew D, Turner, David D

“…The unambiguous retrieval of cloud phase from polarimetric lidar observations is dependent on the assumption that only cloud scattering processes affect…”
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Longitudinal and geomagnetic activity modulation of the equatorial thermosphere anomaly by Lei, Jiuhou, Thayer, Jeffrey P., Forbes, Jeffrey M.

“…In this paper we examine the detailed similarities and differences between the equatorial thermosphere anomaly (ETA) and the equatorial ionization anomaly…”
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Superposed epoch analyses of thermospheric response to CIRs: Solar cycle and seasonal dependencies by Liu, Jing, Liu, Libo, Zhao, Biqiang, Lei, Jiuhou, Thayer, Jeffrey P., McPherron, Robert L.

“…Thermospheric response to Corotating Interaction Regions (CIRs) has been studied previously; however, its solar cycle and seasonal effects have not been fully…”
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Global thermospheric density variations caused by high-speed solar wind streams during the declining phase of solar cycle 23 by Lei, Jiuhou, Thayer, Jeffrey P., Forbes, Jeffrey M., Sutton, Eric K., Nerem, R. Steven, Temmer, Manuela, Veronig, Astrid M.

“…Thermosphere densities at 400 km altitude from accelerometer measurements on the CHAMP satellite are used to investigate oscillations at periods of less than…”
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Rapid recovery of thermosphere density during the October 2003 geomagnetic storms by Lei, Jiuhou, Thayer, Jeffrey P., Lu, Gang, Burns, Alan G., Wang, Wenbin, Sutton, Eric K., Emery, Barbara A.

“…Thermosphere densities from the CHAMP and GRACE satellites are utilized, for the first time, to study the recovery of the thermosphere as a function of…”
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The winter helium bulge revisited by Liu, Xianjing, Wang, Wenbin, Thayer, Jeffrey P., Burns, Alan, Sutton, Eric, Solomon, Stanley C., Qian, Liying, Lucas, Greg

“…A newly implemented helium module in the National Center for Atmospheric Research‐Thermosphere Ionosphere Electrodynamics general circulation model offers the…”
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