Terdiurnal signatures in sporadic &amp;lt;i&amp;gt;E&amp;lt;/i&amp;gt; layers at midlatitudes

Fytterer, Tilo; Arras, Christina; Jacobi, Christoph

doi:10.5194/ars-11-333-2013

Cited by 19 publications

(19 citation statements)

References 13 publications

(12 reference statements)

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“…The associations of intermediate-timescale (H * (t) and D * (t)) contributions with ionospheric physical processes has been made by looking at their characteristic timescales (Table 1) (Feldstein and Zeitev, 1968;Dominici et al, 1997;Fytterer et al, 2013) and taking into account that the time behavior of H * (t) and D * (t) is in agreement with the solar quiet daily variation observed in October at L'Aquila, as determined by De Michelis et al (2010). So, our findings seem to suggest that the H * (t) and the D * (t) fields are of ionospheric origin.…”

Section: Ssq Contributionsmentioning

confidence: 99%

Identification of the different magnetic field contributions during a geomagnetic storm in magnetospheric and ground observations

et al. 2016

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Abstract. We used the empirical mode decomposition (EMD) to investigate the time variation of the magnetospheric and ground-based observations of the Earth's magnetic field during both quiet and disturbed periods. We found two timescale variations in magnetospheric data which are associated with different magnetospheric current systems and the characteristic diurnal orbital variation, respectively. On the ground we identified three timescale variations related to the solar-wind-magnetosphere high-frequency interactions, the ionospheric processes, and the internal dynamics of the magnetosphere. This approach is able to identify the different physical processes involved in solar-windmagnetosphere-ionosphere coupling. In addition, the largetimescale contribution can be used as a local index for the identification of the intensity of a geomagnetic storm on the ground.

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Section: Ssq Contributionsmentioning

confidence: 99%

Identification of the different magnetic field contributions during a geomagnetic storm in magnetospheric and ground observations

et al. 2016

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“…The E s is controlled by the tidal wind and therefore also shows tidal structures in its formation and descent. Main tidal components can be diurnal, semidiurnal, and even terdiurnal and quarterdiurnal (Arras et al, 2009;Chu et al, 2014;Fytterer et al, 2013;Wu et al, 2005). All these factors make the complex E s layer structures understandable.…”

Section: Multiple E S Layers In One Profilementioning

confidence: 99%

Case study on complex sporadic E layers observed by GPS radio occultations

et al. 2015

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Abstract. The occurrence of sporadic E (E s ) layers has been a hot scientific topic for a long time. The GNSS (global navigation satellite system)-based radio occultation (RO) has proven to be a powerful technique for detecting the global E s layers. In this paper, we focus on some cases of complex E s layers based on the RO data from multiple missions processed in UCAR/CDAAC (University Corporation for Atmospheric Research (UCAR) the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) Data Analysis and Archive Center (CDAAC)). We first show some examples of multiple E s layers occurred in one RO event. Based on the evaluations between colocated simultaneous RO events and between RO and lidar observations, it could be concluded that some of these do manifest the multiple E s layer structures. We then show a case of the occurrence of E s in a broad region during a certain time interval. The result is then validated by independent ionosondes observations. It is possible to explain these complex E s structures using the popular wind shear theory. We could map the global E s occurrence routinely in the near future, given that more RO data will be available. Further statistical studies will enhance our understanding of the E s mechanism. The understanding of E s should benefit both E s -based long-distance communication and accurate neutral RO retrievals.

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“…According to the wind shear theory (Whitehead, 1961) the process of Es formation is a metallic ion convergence owing to the interaction between the Earth's magnetic field, the metallic ion concentration, and the vertical gradient of the horizontal neutral wind, "wind shear" in brief. Neglecting diffusion, the vertical velocity component of the neutral gas, and the electric force, the vertical ion drift w I may be written as (e.g., Haldoupis, 2012;Fytterer et al, 2014;Oikonomou et al, 2014) w I = r · cos I 1 + r 2 U +…”

Section: Introductionmentioning

confidence: 99%

Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear

et al. 2019

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Abstract. The GPS radio occultation (RO) technique is used to study sporadic E (Es) layer plasma irregularities of the Earth's ionosphere on a global scale using GPS signal-to-noise ratio (SNR) profiles from the COSMIC/FORMOSAT-3 satellite. The maximum deviation from the mean SNR can be attributed to the height of the Es layer. Es are generally accepted to be produced by ion convergence due to vertical wind shear in the presence of a horizontal component of the Earth's magnetic field, while the wind shear is provided mainly by the solar tides. Here we present analyses of quarterdiurnal tide (QDT) signatures in Es occurrence rates. From a local comparison with mesosphere/lower thermosphere wind shear obtained with a meteor radar at Collm (51.3∘ N, 13.0∘ E), we find that the phases of the QDT in Es agree well with those of negative vertical shear of the zonal wind for all seasons except for summer, when the QDT amplitudes are small. We also compare the global QDT Es signal with numerical model results. The global distribution of the Es occurrence rates qualitatively agrees with the modeled zonal wind shears. The results indicate that zonal wind shear is indeed an important driving mechanism for the QDT seen in Es.

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Terdiurnal signatures in sporadic <i>E</i> layers at midlatitudes

Cited by 19 publications

References 13 publications

Identification of the different magnetic field contributions during a geomagnetic storm in magnetospheric and ground observations

Identification of the different magnetic field contributions during a geomagnetic storm in magnetospheric and ground observations

Case study on complex sporadic E layers observed by GPS radio occultations

Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear

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