Storm induced large scale TIDs observed in GPS derived TEC

Borries, Claudia; Jakowski, N.; Wilken, Volker

doi:10.5194/angeo-27-1605-2009

Cited by 80 publications

(118 citation statements)

References 19 publications

(21 reference statements)

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“…They are frequently observed through GPS measurements or by ionosondes in middle-and high-latitude regions such as North America (Nicolls et al, 2004;Ding et al, 2007Ding et al, , 2008 and Europe (Borries et al, 2009). They are also commonly observed in middle-and low-latitude regions such as Japan , Brazil (Klausner et al, 2009;de Abreu et al, 2010), and China .…”

Section: Discussionmentioning

confidence: 99%

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

et al. 2013

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Abstract. We report here on two cases of poleward-propagating large-scale traveling ionospheric disturbances (LSTIDs) in China during a medium-scale storm between 27 May and 1 June 2011. The observations were conducted by making use of the Global Positioning System network and ionosondes in China and Southeast Asia. One northeastward-propagating LSTID occurred on the morning of 30 May, while the other was observed during the nighttime of 1 June. Both poleward-traveling LSTIDs occurred during the storm's recovery phase in southern China's low-latitude region (geomagnetic latitude ~ 7.3–24° N) and experienced severe dissipation during their propagation from south to north. Although the initial relative amplitude of the nighttime LSTID was ~ 60% larger than that of the morning event, the nighttime event dissipated more quickly than the morning event because of a strong nighttime enhancement in background total electronic content (TEC) during storm time, which led to strong ion-drag dissipation during the evening. The poleward-propagating LSTIDs exhibit a narrower latitudinal range, a smaller amplitude, and a slightly higher elevation compared with the equatorward-moving LSTIDs observed in the same region. Given these features, the poleward-propagating LSTIDs were likely excited by some local source near southern China. Excitation of secondary LSTIDs during the dissipation of some primary medium-scale disturbances from the lower atmosphere is a possible mechanism.

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Section: Discussionmentioning

confidence: 99%

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

et al. 2013

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“…Our results can be compared with storm-induced large-scale travelling ionospheric disturbances (LSTID). Borries et al (2009) reported recently about LSTID observations over Europe. Their waves are also excited in the auroral region and propagate equatorward at a similar speed (680 m/s on average).…”

Section: Thermospheric Mass Density Effectsmentioning

confidence: 99%

Substorm-related thermospheric density and wind disturbances derived from CHAMP observations

2010

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Abstract. The input of energy and momentum from the magnetosphere is most efficiently coupled into the high latitude ionosphere-thermosphere. The phenomenon we are focusing on here is the magnetospheric substorm. This paper presents substorm related observations of the thermosphere derived from the CHAMP satellite. With its sensitive accelerometer the satellite can measure the air density and zonal winds. Based on a large number of substorm events the average high and low latitude thermospheric response to substorm onsets was deduced. During magnetic substorms the thermospheric density is enhanced first at high latitudes. Then the disturbance travels at an average speed of 650 m/s to lower latitudes, and 3-4 h later the bulge reaches the equator on the night side. Under the influence of the Coriolis force the travelling atmospheric disturbance (TAD) is deflected westward. In accordance with present-day atmospheric models the disturbance zonal wind velocities during substorms are close to zero near the equator before midnight and attain moderate westward velocities after midnight. In general, the wind system is only weakly perturbed ( v y < 20 m/s) by substorms.

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“…The ionization front and related perturbation pattern can be detected and traced by more adequate techniques such as wavelet analysis (cf. Borries et al 2009). Here the propagation is mostly southward.…”

Section: à2mentioning

confidence: 99%

“…Later we see a number of perturbation traces propagating towards Southern Europe. The slopes indicate velocities in the order of 600 m/s typically for large-scale perturbation pattern (e.g., Borries et al 2009). In the afternoon around 15:00 UT starts the equatorward motion of the high-latitude trough which separates polar patches in the north from more regular transport processes in the south.…”

Section: à2mentioning

confidence: 99%

“…Although each ionospheric storm has its individual face, there are some common features which can be separated in statistical studies (e.g., Foerster & Jakowski 2000;Borries et al 2009). To separate perturbation induced changes of TEC from regular behaviour, differential TEC maps presenting the deviation from mean or median reference values can effectively be used.…”

Section: à2mentioning

confidence: 99%

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Monitoring, tracking and forecasting ionospheric perturbations using GNSS techniques

Jakowski

Béniguel

Franceschi

et al. 2012

J. Space Weather Space Clim.

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The paper reviews the current state of GNSS-based detection, monitoring and forecasting of ionospheric perturbations in Europe in relation to the COST action ES0803 ''Developing Space Weather Products and Services in Europe''. Space weather research and related ionospheric studies require broad international collaboration in sharing databases, developing analysis software and models and providing services. Reviewed is the European GNSS data basis including ionospheric services providing derived data products such as the Total Electron Content (TEC) and radio scintillation indices. Fundamental ionospheric perturbation phenomena covering quite different scales in time and space are discussed in the light of recent achievements in GNSS-based ionospheric monitoring. Thus, large-scale perturbation processes characterized by moving ionization fronts, wave-like travelling ionospheric disturbances and finally small-scale irregularities causing radio scintillations are considered. Whereas ground and space-based GNSS monitoring techniques are well developed, forecasting of ionospheric perturbations needs much more work to become attractive for users who might be interested in condensed information on the perturbation degree of the ionosphere by robust indices. Finally, we have briefly presented a few samples illustrating the space weather impact on GNSS applications thus encouraging the scientific community to enhance space weather research in upcoming years.

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Storm induced large scale TIDs observed in GPS derived TEC

Cited by 80 publications

References 19 publications

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

Substorm-related thermospheric density and wind disturbances derived from CHAMP observations

Monitoring, tracking and forecasting ionospheric perturbations using GNSS techniques

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