Pre-storm &amp;lt;I&amp;gt;Nm&amp;lt;/I&amp;gt;F2 enhancements at middle latitudes: delusion or reality?

Mikhailov, A. V.; Perrone, Loredana

doi:10.5194/angeo-27-1321-2009

Cited by 32 publications

(29 citation statements)

References 37 publications

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“…19-23, 2001 andMay 13-17, 2005 storms is observed to be largely control by large southward magnetic field component, high plasma temperature, increase in proton density, flow speed stream and high plasma beta, and these period has no definite effect on the ionospheric foF2, which support the previous study of Chukwuma (2010), Makhailov andPerrone (2009), Liu et al (2008), Lastovicka (2007, 2008), Balasis et al (2006) but may result in large ionospheric effect at the main phase period.…”

Section: Discussionsupporting

confidence: 87%

“…The pre storm effect on ionospheric F2 layer has been thought very puzzling, of which Makhailov and Perrone (2009) has shown that there is no such effect as the prestorm electron concentration of ionospheric F2 enhancement as a phenomenon inalienably related to the following magnetic storm. The observed nighttime electron concentration of ionospheric F2 enhancements at subauroral latitudes may result from plasma transfer from the plasma ring area by meridional thermospheric wind.…”

Section: Introductionmentioning

confidence: 97%

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On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

Adekoya

Chukwuma

Bakare

et al. 2012

Astrophys Space Sci

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This paper presents some features of the ionospheric response observed in equatorial and mid-latitudes region to two strong geomagnetic storms, occurring during Oct. 19-23, 2001 and May 13-17, 2005 and to understand the phenomena of pre-storm that lead to very intense geomagnetic storms. The result point to the fact that pre-storm phenomena that leads to intense ionospheric storm are; large southward turning of interplanetary magnetic field Bz, high electric field, increase in flow speed stream, increase in proton number density, high pressure ram and high plasma beta. The magnitude of Bz turning into southward direction from northward highly depends upon the severity of the storm and the variation in F2 layer parameter at the time of geomagnetic storm are strongly dependent upon the storm intensity. A detailed analysis of the responses of the ionosphere shows that during the storm periods, foF2 values depleted simultaneously both in the equatorial and mid latitude. Observation also shows that low to moderate variations in ionospheric F2 at the pre-storm period may signal the upcoming of large ionospheric disturbances at the main phase. The ionospheric F2response for low and mid latitude does not show any significant differences during the storm main phase and the prestorm period. The ionospheric response during the pre-storm period is thought very puzzling. The period is observed to be depleted throughout with low-moderate effect across all the stations in the low and mid latitude.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 97%

On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

Adekoya

Chukwuma

Bakare

et al. 2012

Astrophys Space Sci

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“…Under the average TAD velocity at F2-region heights of 500-600 m s −1 (Bruinsma and Forbes, 2010;Mikhailov and Perrone, 2009;Mikhailov et al, 2012), the arrival of a TAD at middle latitudes is expected in 2-3 h.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric anomalies detected by ionosonde and possibly related to crustal earthquakes in Greece

et al. 2018

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Abstract. Ionosonde data and crustal earthquakes with magnitude M ≥ 6.0 observed in Greece during the 2003-2015 period were examined to check if the relationships obtained earlier between precursory ionospheric anomalies and earthquakes in Japan and central Italy are also valid for Greek earthquakes. The ionospheric anomalies are identified on the observed variations of the sporadic E-layer parameters (h Es, foEs) and foF2 at the ionospheric station of Athens. The corresponding empirical relationships between the seismoionospheric disturbances and the earthquake magnitude and the epicentral distance are obtained and found to be similar to those previously published for other case studies.The large lead times found for the ionospheric anomalies occurrence may confirm a rather long earthquake preparation period. The possibility of using the relationships obtained for earthquake prediction is finally discussed.

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“…The first and the second common high-energy regions are marked by white rectangles, corresponding to the long time effect for the periods 12-18 April 2008 and 20-26 April 2008, respectively. The reason is that the ionosphere can be enhanced or decreased during the geomagnetic activity period for several days before and after a geomagnetic storm (Liu et al, 2008a, b;Zhao et al, 2009;Mikhailov and Perrone, 2009). In addition, many high-energy regions containing short time effects (marked by red ellipses) also emerged, corresponding to the dates 29 and 30 April and 1 and 6 May 2008, respectively.…”

Section: Wenchuan Earthquakementioning

confidence: 99%

Is there a one-to-one correspondence between ionospheric anomalies and large earthquakes along Longmenshan faults?

Wu²,

Santis³

et al. 2014

Ann. Geophys.

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In this paper, an integrated wavelet analysis methodology is proposed to detect and diagnose ionospheric total electron content (TEC) anomalies related to seismic activities. Analytic wavelet transform is used to detect ionospheric perturbations, and then cross-wavelet analysis is used to diagnose ionospheric anomalies by gaining further insights into the dynamic relationship between the anomaly variability of ionospheric TEC and geomagnetic indices for the same set of observations. The results show that a significant ionospheric disturbance occurred on 9 May 2008 above the forthcoming epicenter, 3 days prior to the Wenchuan earthquake. However, we did not observe an ionospheric anomaly over the epicenter of the Ya'an earthquake during the 1 month period before the shock. Finally, we discuss the possible interpretations of the different seismo-ionospheric effects for the two similar earthquakes.

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Pre-storm <I>Nm</I>F2 enhancements at middle latitudes: delusion or reality?

Cited by 32 publications

References 37 publications

On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

On the effects of geomagnetic storms and pre storm phenomena on low and middle latitude ionospheric F2

Ionospheric anomalies detected by ionosonde and possibly related to crustal earthquakes in Greece

Is there a one-to-one correspondence between ionospheric anomalies and large earthquakes along Longmenshan faults?

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