Articles | Volume 36, issue 4
https://doi.org/10.5194/angeo-36-1141-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-36-1141-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
24 Aug 2018
Regular paper |
| 24 Aug 2018
| 24 Aug 2018
An empirical model of the thermospheric mass density derived from CHAMP satellite
GFZ German Research Centre for Geosciences, Telegrafenberg, 14473
Potsdam, Germany
Hermann Lühr
GFZ German Research Centre for Geosciences, Telegrafenberg, 14473
Potsdam, Germany
Michael Schmidt
Deutsches Geodätisches Forschungsinstitut at
the Technische Universität München (DGFI-TUM), Arcisstr.
21, 80333 Munich, Germany
Mathis Bloßfeld
Deutsches Geodätisches Forschungsinstitut at
the Technische Universität München (DGFI-TUM), Arcisstr.
21, 80333 Munich, Germany
Sergei Rudenko
Deutsches Geodätisches Forschungsinstitut at
the Technische Universität München (DGFI-TUM), Arcisstr.
21, 80333 Munich, Germany
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We develop a new criterion to determine Es, i.e., when the mean value of the absolute value of the difference between the normalized SNR is greater than 3 times the standard deviation. We show that Es have strong seasonal variations, with the highest occurrence rates in the summer season at midlatitudes mainly located at 90–110 km at 14:00–20:00 LT. The comparison of Es altitudes from radio occultation profiles with ionosonde revealed a large correspondence between both measurement techniques.
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The plasma bubbles and blobs were recorded on two successive days. The interesting is that one of the event occured in a quiet day, and the other in the main phase of a storm. The latitudinal variations of electron density at low- and middle ionosphere were used to analyze the physical factors leading to the variations in the F region and the occurrence of plasma bubbles and blobs. The work would help to understand the dominant factor accounting for the day-to-day occurrence of irregularities.
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The solar activity dependence of nonmigrating tides in electron density at low and middle latitudes observed by CHAMP and GRACE are investigated. The absolute amplitudes of DE3 at low latitudes as well as DE1, D0 and DW2 at middle latitudes are highly related to the solar activity, while their relative amplitudes show little dependence on the solar activity. A clear modulation by the QBO is found in the relative amplitudes of DE3 at low latitudes.
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This is the first study considering ionospheric currents (both field-aligned current and Hall current) derived from high-resolution magnetic field data of the Swarm constellation in both hemispheres. The prominent auroral electrojets are found to be closely controlled by the solar wind input, but we find no dependence of their intensity on the IMF By orientation. An important finding is that all the IMF By dependences of FACs and Hall currents practically disappear in the dark winter hemisphere.
Graham D. Quartly, Jean-François Legeais, Michaël Ablain, Lionel Zawadzki, M. Joana Fernandes, Sergei Rudenko, Loren Carrère, Pablo Nilo García, Paolo Cipollini, Ole B. Andersen, Jean-Christophe Poisson, Sabrina Mbajon Njiche, Anny Cazenave, and Jérôme Benveniste
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Eren Erdogan, Michael Schmidt, Florian Seitz, and Murat Durmaz
Ann. Geophys., 35, 263–277, https://doi.org/10.5194/angeo-35-263-2017, https://doi.org/10.5194/angeo-35-263-2017, 2017
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Although the number of terrestrial GNSS receivers is rapidly growing, the rather unevenly distributed observations do not allow the generation of high-resolution global ionosphere products. With the regionally enormous increase in GNSS data, the demands on near real-time products are growing very fast. Thus, a procedure for estimating the vertical total electron content based on B-spline representations and Kalman filtering was developed and validated by self-consistency check and altimetry.
Hermann Lühr, Tao Huang, Simon Wing, Guram Kervalishvili, Jan Rauberg, and Haje Korth
Ann. Geophys., 34, 901–915, https://doi.org/10.5194/angeo-34-901-2016, https://doi.org/10.5194/angeo-34-901-2016, 2016
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ESA's constellation mission Swarm makes it possible for the first time to determine field-aligned currents (FACs) reliably in the ionosphere. FACs are able to transport energy from the solar wind to the Earth and heat the upper atmosphere. Here we investigate FAC structures that have been missed by previous satellite missions. Most of them are found poleward of the northern light zone. The energy sources seem to be located on the nightside of Earth about 100 000 km away.
Yun-Liang Zhou, Li Wang, Chao Xiong, Hermann Lühr, and Shu-Ying Ma
Ann. Geophys., 34, 463–472, https://doi.org/10.5194/angeo-34-463-2016, https://doi.org/10.5194/angeo-34-463-2016, 2016
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The solar activity dependence of nonmigrating tides in electron density at low and middle latitudes observed by CHAMP and GRACE are investigated. The absolute amplitudes of DE3 at low latitudes as well as DE1, D0 and DW2 at middle latitudes are highly related to the solar activity, while their relative amplitudes show little dependence on the solar activity. A clear modulation by the QBO is found in the relative amplitudes of DE3 at low latitudes.
J. Park, H. Lühr, C. Stolle, G. Malhotra, J. B. H. Baker, S. Buchert, and R. Gill
Ann. Geophys., 33, 829–835, https://doi.org/10.5194/angeo-33-829-2015, https://doi.org/10.5194/angeo-33-829-2015, 2015
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Though high-latitude plasma convection has been monitored with a number of methods, more independent measurements are still warranted. In this study we introduce an automatic method to estimate along-track plasma drift velocity in the high-latitude ionosphere using the Swarm constellation. The obtained velocity is in qualitative agreement with Super Dual Auroral Radar Network (SuperDARN) data. The method can be generalized to any satellite constellations in pearls-on-a-string configurations.
T. A. Siddiqui, H. Lühr, C. Stolle, and J. Park
Ann. Geophys., 33, 235–243, https://doi.org/10.5194/angeo-33-235-2015, https://doi.org/10.5194/angeo-33-235-2015, 2015
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This paper presents the long-term observations of lunar tidal signatures in the equatorial electrojet (EEJ) and their relation to stratospheric sudden warming (SSW) events. We propose an approach to estimate the occurrence of SSW events before their direct observations (before 1952) from the magnetic field observations at Huancayo.
C. Xiong, Y.-L. Zhou, H. Lühr, and S.-Y. Ma
Ann. Geophys., 33, 185–196, https://doi.org/10.5194/angeo-33-185-2015, https://doi.org/10.5194/angeo-33-185-2015, 2015
J. Park, H. Lühr, and M. Noja
Ann. Geophys., 33, 129–135, https://doi.org/10.5194/angeo-33-129-2015, https://doi.org/10.5194/angeo-33-129-2015, 2015
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Total electron content (TEC) between low-Earth-orbit (LEO) satellites and the Global Navigation Satellite System (GNSS) satellites can be used to constrain three-dimensional morphology of equatorial plasma bubbles (EPBs). TEC gradient observed along the LEO track is strongest when the corresponding GNSS satellite is located equatorward and westward of the LEO satellite. This anisotropy supports the idea that EPBs have three-dimensional shell structures.
M. Ablain, A. Cazenave, G. Larnicol, M. Balmaseda, P. Cipollini, Y. Faugère, M. J. Fernandes, O. Henry, J. A. Johannessen, P. Knudsen, O. Andersen, J. Legeais, B. Meyssignac, N. Picot, M. Roca, S. Rudenko, M. G. Scharffenberg, D. Stammer, G. Timms, and J. Benveniste
Ocean Sci., 11, 67–82, https://doi.org/10.5194/os-11-67-2015, https://doi.org/10.5194/os-11-67-2015, 2015
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This paper presents various respective data improvements achieved within the European Space Agency (ESA) Climate Change Initiative (ESA CCI) project on sea level during its first phase (2010-2013), using multi-mission satellite altimetry data over the 1993-2010 time span.
M. Limberger, W. Liang, M. Schmidt, D. Dettmering, M. Hernández-Pajares, and U. Hugentobler
Ann. Geophys., 32, 1533–1545, https://doi.org/10.5194/angeo-32-1533-2014, https://doi.org/10.5194/angeo-32-1533-2014, 2014
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The determination of ionospheric key quantities such as the maximum electron density of the F2 layer, the corresponding F2 peak height and the F2 scale height are of high relevance in 4-D ionosphere modeling to provide information on the vertical structure of the electron density distribution. This paper discusses mathematical correlations between these parameters as derived from FORMOSAT-3/COSMIC radio occultations and regionally parameterized by means of polynomial B-splines.
K. Schlegel and H. Lühr
Hist. Geo Space. Sci., 5, 149–154, https://doi.org/10.5194/hgss-5-149-2014, https://doi.org/10.5194/hgss-5-149-2014, 2014
C. Xiong, H. Lühr, H. Wang, and M. G. Johnsen
Ann. Geophys., 32, 609–622, https://doi.org/10.5194/angeo-32-609-2014, https://doi.org/10.5194/angeo-32-609-2014, 2014
C. Xiong and H. Lühr
Ann. Geophys., 32, 623–631, https://doi.org/10.5194/angeo-32-623-2014, https://doi.org/10.5194/angeo-32-623-2014, 2014
H. Wang, H. Lühr, A. Ridley, and T. Huang
Ann. Geophys., 32, 533–542, https://doi.org/10.5194/angeo-32-533-2014, https://doi.org/10.5194/angeo-32-533-2014, 2014
G. N. Kervalishvili and H. Lühr
Ann. Geophys., 32, 249–261, https://doi.org/10.5194/angeo-32-249-2014, https://doi.org/10.5194/angeo-32-249-2014, 2014
M. Limberger, W. Liang, M. Schmidt, D. Dettmering, and U. Hugentobler
Ann. Geophys., 31, 2215–2227, https://doi.org/10.5194/angeo-31-2215-2013, https://doi.org/10.5194/angeo-31-2215-2013, 2013
H. Wang and H. Lühr
Ann. Geophys., 31, 1521–1534, https://doi.org/10.5194/angeo-31-1521-2013, https://doi.org/10.5194/angeo-31-1521-2013, 2013
J. Park, H. Lühr, and J. Rauberg
Ann. Geophys., 31, 1507–1520, https://doi.org/10.5194/angeo-31-1507-2013, https://doi.org/10.5194/angeo-31-1507-2013, 2013
H. Lühr and C. Manoj
Ann. Geophys., 31, 1315–1331, https://doi.org/10.5194/angeo-31-1315-2013, https://doi.org/10.5194/angeo-31-1315-2013, 2013
C. Xiong and H. Lühr
Ann. Geophys., 31, 1115–1130, https://doi.org/10.5194/angeo-31-1115-2013, https://doi.org/10.5194/angeo-31-1115-2013, 2013
J. Park and H. Lühr
Ann. Geophys., 31, 1035–1044, https://doi.org/10.5194/angeo-31-1035-2013, https://doi.org/10.5194/angeo-31-1035-2013, 2013
G. N. Kervalishvili and H. Lühr
Ann. Geophys., 31, 541–554, https://doi.org/10.5194/angeo-31-541-2013, https://doi.org/10.5194/angeo-31-541-2013, 2013
B. Heilig and H. Lühr
Ann. Geophys., 31, 529–539, https://doi.org/10.5194/angeo-31-529-2013, https://doi.org/10.5194/angeo-31-529-2013, 2013
H. Lühr, F. Yin, and R. Bock
J. Sens. Sens. Syst., 2, 9–17, https://doi.org/10.5194/jsss-2-9-2013, https://doi.org/10.5194/jsss-2-9-2013, 2013
S. Rudenko, N. Schön, M. Uhlemann, and G. Gendt
Solid Earth, 4, 23–41, https://doi.org/10.5194/se-4-23-2013, https://doi.org/10.5194/se-4-23-2013, 2013
Y. L. Zhou, S. Y. Ma, R. S. Liu, H. Luehr, and E. Doornbos
Ann. Geophys., 31, 15–30, https://doi.org/10.5194/angeo-31-15-2013, https://doi.org/10.5194/angeo-31-15-2013, 2013
Related subject area
Subject: Terrestrial atmosphere and its relation to the sun | Keywords: Modelling of the atmosphere
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Matthew J. Griffith and Nicholas J. Mitchell
Ann. Geophys., 40, 327–358, https://doi.org/10.5194/angeo-40-327-2022, https://doi.org/10.5194/angeo-40-327-2022, 2022
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There is great scientific interest in extending atmospheric models, such as the Met Office’s Unified Model, upwards to include the upper atmosphere. Atmospheric tides are an important driver of circulation at these greater heights. This study provides a first in-depth analysis of the migrating and non-migrating components of these tides, examining important tidal properties. Our results show that the ExUM produces a rich spectrum of spatial components, with significant non-migrating components.
Matthew J. Griffith, Shaun M. Dempsey, David R. Jackson, Tracy Moffat-Griffin, and Nicholas J. Mitchell
Ann. Geophys., 39, 487–514, https://doi.org/10.5194/angeo-39-487-2021, https://doi.org/10.5194/angeo-39-487-2021, 2021
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There is great scientific interest in extending atmospheric models upwards to include the upper atmosphere. The Met Office’s Unified Model has recently been successfully extended to include this region. Atmospheric tides are an important driver of atmospheric motion at these greater heights. This paper provides a first comparison of winds and tides produced by the new extended model with meteor radar observations, comparing key tidal properties and discussing their similarities and differences.
Marion Heublein, Patrick Erik Bradley, and Stefan Hinz
Ann. Geophys., 38, 179–189, https://doi.org/10.5194/angeo-38-179-2020, https://doi.org/10.5194/angeo-38-179-2020, 2020
Yuliya Kurdyaeva, Sergey Kulichkov, Sergey Kshevetskii, Olga Borchevkina, and Elena Golikova
Ann. Geophys., 37, 447–454, https://doi.org/10.5194/angeo-37-447-2019, https://doi.org/10.5194/angeo-37-447-2019, 2019
Short summary
Short summary
To simulate the vertical propagation of atmospheric waves, experimental data on pressure variations at the Earth's surface are used. These data are associated with the meteorological source. The simulation results have allowed for the first time estimates of the amplitudes of temperature wave disturbances in the upper atmosphere caused by waves from the atmospheric front. The simulations have been performed using the Lomonosov supercomputer.
Michal Kačmařík, Jan Douša, Florian Zus, Pavel Václavovic, Kyriakos Balidakis, Galina Dick, and Jens Wickert
Ann. Geophys., 37, 429–446, https://doi.org/10.5194/angeo-37-429-2019, https://doi.org/10.5194/angeo-37-429-2019, 2019
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We provide an analysis of processing setting impacts on tropospheric gradients estimated from GNSS observation processing. These tropospheric gradients are related to water vapour distribution in the troposphere and therefore can be helpful in meteorological applications.
Zhaohui Xiong, Bao Zhang, and Yibin Yao
Ann. Geophys., 37, 25–36, https://doi.org/10.5194/angeo-37-25-2019, https://doi.org/10.5194/angeo-37-25-2019, 2019
Short summary
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A comparison between the GNSS tomography technique and WRFDA in retrieving wet refractivity (WR) is conducted in HK during a wet period and a dry period. The results show that both of them can retrieve good WR. In most of the cases, the WRFDA output outperforms the tomographic WR, but the tomographic WR is better than the WRFDA output in the lower troposphere in the dry period. By assimilating better tomographic WR in the lower troposphere into the WRFDA, we slightly improve the retrieved WR.
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