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Description of the multi-approach gravity field models from Swarm GPS data

De Teixeira Da Encarnação, J. (author), Visser, P.N.A.M. (author), Arnold, Daniel (author), Bezdek, Ales (author), Doornbos, E.N. (author), Ellmer, Matthias (author), Guo, Junyi (author), van den IJssel, J.A.A. (author), Iorfida, E. (author)

Although the knowledge of the gravity of the Earth has improved considerably with CHAMP, GRACE, and GOCE (see appendices for a list of abbreviations) satellite missions, the geophysical community has identified the need for the continued monitoring of the time-variable component with the purpose of estimating the hydrological and...

journal article 2020

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Comparing high-latitude thermospheric winds from Fabry-Perot interferometer (FPI) and challenging mini-satellite payload (CHAMP) accelerometer measurements

Aruliah, Anasuya (author), Förster, Matthias (author), Hood, Rosie (author), McWhirter, Ian (author), Doornbos, E.N. (author)

<p>It is generally assumed that horizontal wind velocities are independent of height above the F&lt;span classCombining double low line"inline-formula"&gt;1&lt;/span&gt; region (&amp;gt;300km) due to the large molecular viscosity of the upper thermosphere. This assumption is used to compare two completely different methods of thermospheric...

journal article 2019

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Horizontal and vertical thermospheric cross-wind from GOCE linear and angular accelerations

Visser, T. (author), March, G. (author), Doornbos, E.N. (author), de Visser, C.C. (author), Visser, P (author)

Thermospheric wind measurements obtained from linear non-gravitational accelerations of the Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite show discrepancies when compared to ground-based measurements. In this paper the cross-wind is derived from both the linear and the angular accelerations using a newly developed...

journal article 2019

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Characterization of Thermospheric Vertical Wind Activity at 225- to 295-km Altitude Using GOCE Data and Validation Against Explorer Missions

Visser, T. (author), March, G. (author), Doornbos, E.N. (author), de Visser, C.C. (author), Visser, P.N.A.M. (author)

Recently, the horizontal and vertical cross wind at 225- to 295-km altitude were derived from linear acceleration measurements of the Gravity field and steady-state Ocean Circulation Explorer satellite. The vertical component of these wind data is compared to wind data derived from the mass spectrometers of the Atmosphere Explorer C and E and...

journal article 2019

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Satellite observations of middle atmosphere-Thermosphere vertical coupling by gravity waves

Trinh, Quang Thai (author), Ern, Manfred (author), Doornbos, E.N. (author), Preusse, Peter (author), Riese, Martin (author)

Atmospheric gravity waves (GWs) are essential for the dynamics of the middle atmosphere. Recent studies have shown that these waves are also important for the thermosphere/ionosphere (T/I) system. Via vertical coupling, GWs can significantly influence the mean state of the T/I system. However, the penetration of GWs into the T/I system is not...

journal article 2018

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CHAMP, GRACE, GOCE and Swarm density and wind characterization with improved gas-surface interactions modelling (PPT)

March, G. (author), Doornbos, E.N. (author), Visser, P.N.A.M. (author)

other 2018

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Update on thermospheric density products from satellite observations

March, G. (author), Visser, T. (author), Doornbos, E.N. (author), Iorfida, E. (author), van den IJssel, J.A.A. (author), Visser, P.N.A.M. (author)

poster 2018

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Seasonal Dependence of Geomagnetic Active-Time Northern High-Latitude Upper Thermospheric Winds

Dhadly, Manbharat S. (author), Emmert, John T. (author), Drob, Douglas P. (author), Conde, Mark G. (author), Doornbos, E.N. (author), Shepherd, Gordon (author), Makela, Jonathan (author), Wu, Qian (author), Nieciejewski, Richard J. (author), Ridley, Aaron J. (author)

This study is focused on improving the poorly understood seasonal dependence of northern high-latitude F region thermospheric winds under active geomagnetic conditions. The gaps in our understanding of the dynamic high-latitude thermosphere are largely due to the sparseness of thermospheric wind measurements. With current observational...

journal article 2018

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Correlations Between the Thermosphere's Semiannual Density Variations and Infrared Emissions Measured With the SABER Instrument

Weimer, D. R. (author), Mlynczak, M. G. (author), Emmert, J. T. (author), Doornbos, E.N. (author), Sutton, E.H. (author), Hunt, L. A. (author)

This paper presents measurements of the amplitudes and timings of the combined, annual, and semiannual variations of thermospheric neutral density, and a comparison of these density variations with measurements of the infrared emissions from carbon dioxide and nitric oxide in the thermosphere. The density values were obtained from...

journal article 2018

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Torque model verication for the GOCE satellite

Visser, T. (author), Doornbos, E.N. (author), de Visser, C.C. (author), Visser, P.N.A.M. (author), Fritsche, Bent (author)

journal article 2018

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Global Ionospheric and Thermospheric Effects of the June 2015 Geomagnetic Disturbances: Multi-Instrumental Observations and Modeling

Astafyeva, E (author), Zakharenkova, I (author), Huba, J. D. (author), Doornbos, E.N. (author), van den IJssel, J.A.A. (author)

By using data from multiple instruments, we investigate ionospheric/thermospheric behavior during the period from 21 to 23 June 2015, when three interplanetary shocks (IS) of different intensities arrived at Earth. The first IS was registered at 16:45 UT on 21 June and caused ~50 nT increase in the SYM-H index. The second IS arrived at 5:45...

journal article 2017

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Thermospheric recovery during the 5 April 2010 geomagnetic storm

Sheng, Cheng (author), Lu, Gang (author), Solomon, Stanley C. (author), Wang, Wenbin (author), Doornbos, E.N. (author), Hunt, Linda A. (author), Mlynczak, Martin G. (author)

Thermospheric temperature and density recovery during the 5 April 2010 geomagnetic storm has been investigated in this study. Neutral density recovery as revealed by Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIEGCM) simulations was slower than observations from GOCE, CHAMP, and GRACE satellites, suggesting that the...

journal article 2017

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Horizontal and Vertical Wind Measurements from GOCE Angular Accelerations

Visser, T. (author), Doornbos, E.N. (author), de Visser, C.C. (author), Visser, P.N.A.M. (author)

Because of the highly accurate accelerometers, the GOCE mission has proven to be a unique source of thermosphere neutral density and cross-wind data. In the current methods, in which only the horizontal linear accelerations are used, the vertical winds cannot be obtained. In the algorithm proposed in this paper, angular accelerations derived...

poster 2017

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Horizontal and Vertical Wind Measurements from GOCE Angular Accelerations

Visser, T. (author), Doornbos, E.N. (author), de Visser, C.C. (author), Visser, P.N.A.M. (author)

Because of the highly accurate accelerometers, the GOCE mission has proven to be a unique source of thermosphere neutral density and cross-wind data. In the current methods, in which only the horizontal linear accelerations are used, the vertical winds cannot be obtained. In the algorithm proposed in this paper, angular accelerations derived...

abstract 2017

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CHAMP, GRACE, GOCE and Swarm Thermosphere Density Data with Improved Aerodynamic and Geometry Modelling

March, G. (author), Doornbos, E.N. (author), Visser, P.N.A.M. (author)

Since 2000, accelerometers on board of the CHAMP, GRACE, GOCE and Swarm satellites have provided highresolution thermosphere density data, improving knowledge on atmospheric dynamics and coupling processes in the thermosphere-ionosphere layer. Most of the research has focused on relative changes in density. Scale differences between datasets and...

poster 2017

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Seasonal dependence of northern high-latitude upper thermospheric winds: A quiet time climatological study based on ground-based and space-based measurements

Dhadly, Manbharat (author), Emmert, John (author), Drob, Douglas (author), Conde, Mark (author), Doornbos, E.N. (author), Shepherd, Gordon (author), Makela, Jonathan (author), Wu, Qian (author), Niciejewski, Rick (author), Ridley, Aaron (author)

This paper investigates the large-scale seasonal dependence of geomagnetically quiet time, northern high-latitude F region thermospheric winds by combining extensive observations from eight ground-based (optical remote sensing) and three space-based (optical remote sensing and in situ) instruments. To provide a comprehensive picture of the...

journal article 2017

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Gravity field models derived from Swarm GPS data

De Teixeira Da Encarnação, J. (author), Arnold, Daniel (author), Bezděk, Aleš (author), Dahle, Christoph (author), Doornbos, E.N. (author), van den IJssel, J.A.A. (author), Jäggi, Adrian (author), Mayer-Gürr, Torsten (author), Sebera, Josef (author), Visser, P.N.A.M. (author), Zehentner, Norbert (author)

It is of great interest to numerous geophysical studies that the time series of global gravity field models derived from Gravity Recovery and Climate Experiment (GRACE) data remains uninterrupted after the end of this mission. With this in mind, some institutes have been spending efforts to estimate gravity field models from alternative...

journal article 2016

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Synthetic thermosphere winds based on CHAMP neutral and plasma density measurements

Gasperini, F. (author), Forbes, J. M. (author), Doornbos, E.N. (author), Bruinsma, S. L. (author)

Meridional winds in the thermosphere are key to understanding latitudinal coupling and thermosphere-ionosphere coupling, and yet global measurements of this wind component are scarce. In this work, neutral and electron densities measured by the Challenging Minisatellite Payload (CHAMP) satellite at solar low and geomagnetically quiet...

journal article 2016

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GOCE Aerodynamic Torque Modeling

Visser, T. (author), Doornbos, E.N. (author), de Visser, C.C. (author), Visser, P.N.A.M. (author), Fritsche, B (author)

In recent studies thermospheric densities and cross-winds have been derived from linear acceleration measurements of the gradiometer on board the GOCE satellite. Our current work is aimed at analyzing also the angular accelerations, in order to improve the thermosphere density and wind data by allowing for the estimation of more unknown...

poster 2016

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Swarm accelerometer data processing from raw accelerations to thermospheric neutral densities

Siemes, C. (author), De Teixeira Da Encarnação, J. (author), Doornbos, E.N. (author), van den IJssel, J.A.A. (author), Kraus, Jiří (author), Pereštý, Radek (author), Grunwaldt, Ludwig (author), Apelbaum, Guy (author), Flury, Jakob (author), Holmdahl Olsen, Poul Erik (author)

The Swarm satellites were launched on November 22, 2013, and carry accelerometers and GPS receivers as part of their scientific payload. The GPS receivers do not only provide the position and time for the magnetic field measurements, but are also used for determining non-gravitational forces like drag and radiation pressure acting on the...

journal article 2016