Daytime efficiency and characteristic time scale of interplanetary electric fields penetration to equatorial latitude ionosphere

Denardini, Clezio Marcos; Aveiro, H. C.; Almeida, Pedro S.; Resende, L. C. A.; Guizelli, L. M.; Moro, Juliano; Sobral, J. H. A.; Abdu, M. A.

doi:10.1016/j.jastp.2010.09.003

Cited by 14 publications

(13 citation statements)

References 18 publications

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“…Although the subscript 'p' intended to mean planetary (from the German word planetarische ), the South American sector is poorly represented in Kp deviation. Also, from previous works using magnetic data obtained in South America (Trivedi et al, 2005;Denardini et al, 2009Denardini et al, , 2011Moro et al, 2012), we have verified some peculiarities with respect to the magnetic variations due to the electric fields associated with the Sq current system (during quit and disturbed periods) and magnetospheric current system (the ring current during disturbed periods) that we were not able to explain using the classical magnetic indices like AE, Dst and Kp (Rostoker, 1972). Therefore, we decided to create the Embrace Magnetometer Network to provide reliable magnetic data from several part of the South American territory and to start developing the South American K index (Ksa), which can be confronted with the traditional Kp to check its validity.…”

Section: Introductionsupporting

confidence: 68%

The Initial Steps for Developing the South American K Index From the Embrace Magnetometer Network

Denardini¹,

Silva²,

Gende³

et al. 2015

Rev. Bras. Geof.

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ABSTRACT. In this paper we present the first steps given towards the development of the South American K index (Ksa) based on the measurements made by the Embrace Magnetometer Network. We present: (a) a description of the magnetometer and of the network; (b) the procedure used to calibrate the network equipments; (c) the procedure to obtain each station K scale and its corresponding upper limits of ranges for the three-hour-range station K index (thereafter referred as K9 threshold); and (d) some particularities regarding the Quiet Day Curve (QDC) deviation and its long term variation.Keywords: space weather, magnetic index, magnetometer network, aeronomy. RESUMO.No presente artigo, apresentamos os primeiros passos realizados para desenvolvermos oíndice K sul-americano (Ksa) baseado nas medidas feitas pela rede Embrace de magnetômetros. Apresentamos (a) uma descrição do equipamento utilizado, bem como da rede de magnetômetros; (b) o procedimento adotado para calibrar todos os equipamentos individuais da rede; (c) o procedimento para se obter a escala K de cada estação magnética e o seu correspondente limite superior para oíndice K de três horas (doravante denominado limiar K9); e (d) algumas particularidades com respeitoà obtenção da curva do Dia Quieto (QDC) e suas variações de longos períodos.Palavras-chave: clima espacial,índice magnético, rede de magnetômetros, aeronomia.

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Section: Introductionsupporting

confidence: 68%

The Initial Steps for Developing the South American K Index From the Embrace Magnetometer Network

Denardini¹,

Silva²,

Gende³

et al. 2015

Rev. Bras. Geof.

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“…Note that here we have used a 10% efficiency rate. Denardini et al (2011) A strong coupling between the magnetosphere and the ionosphere is observed in the events of 7-12 November through the PPEF. The behavior of the ionosphere during this event has been modeled by some authors.…”

Section: Discussionmentioning

confidence: 97%

“…Note that here we have used a 10% efficiency rate. Denardini et al () calculated the Δ H drifts deduced for the Brazilian sector during the 17 April 2002 and 31 March 2001 storms and compared them with the IEF values. They found an efficiency of 11%.…”

Section: Discussionmentioning

confidence: 99%

“…This correlation is positive during the day and negative during the night. Some authors have found that the penetration of the IEF to the equatorial ionosphere electric field has efficiencies between 3% and 14% (e.g., Burke et al, 2007;Denardini et al, 2011;Huang et al, 2007Huang et al, , 2010Kelley et al, 2003;Kelley & Retterer, 2008;Retterer & Kelley, 2010;Wei et al, 2008). The advantage of this alternative is that it has a greater temporal availability.…”

Section: Introductionmentioning

confidence: 99%

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Equatorial Ionospheric Response to Different Estimated Disturbed Electric Fields as Investigated Using Sheffield University Plasmasphere Ionosphere Model at INPE

et al. 2017

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Good ionospheric modeling is important to understand anomalous effects, mainly during geomagnetic storm events. Ionospheric electric fields, thermospheric winds, and neutral composition are affected at different degrees, depending on the intensity of the magnetic disturbance which, in turns, affects the electron density distribution at all latitudes. The most important disturbed parameter for the equatorial ionosphere is the electric field, which is responsible for the equatorial ionization anomaly. Here various electric field measurements and models are analyzed: (1) measured by the Jicamarca incoherent scatter radar (ISR), (2) from Jicamarca Unattended Long‐Term studies of the Ionosphere and Atmosphere (JULIA) radar, (3) deduced from magnetometers, (4) calculated from the time variations of the F layer height (dh′F/dt), and (5) deduced from interplanetary electric field determinations. The response of ionospheric parameters foF2 and hmF2 to the electric fields simulated using the Sheffield University Plasmasphere Ionosphere Model version available at Instituto Nacional de Pesquisas Espaciais is compared with observations for two locations, during the geomagnetic storm events of 17–18 April 2002 and 7–10 November 2004. Results are found to be consistent with the observations in such a way that a hierarchy among the different types of drifts used can be established. When no ISR measurements are available, the drifts deduced from magnetometers or measured by the JULIA are best when including the contribution derived from dh′F/dt for the 18–24 LT time interval. However, when none of these drifts are available, drifts inferred from the interplanetary electric field seem to be a good alternative for some purposes.

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“…Also, specifically about the responses of the E regions electric field (EF), drivers of the EEJ, to storm time, significant progress have being made by Denardini et al . [, ] to explain the behavior of the plasma irregularities (driven by electric field) to the disturbance dynamo. In addition, Shume et al .…”

Section: Introductionmentioning

confidence: 99%

E region electric field dependence of the solar activity

et al. 2015

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We have being studying the zonal and vertical E region electric field components inferred from the Doppler shifts of type 2 echoes (gradient drift irregularities) detected with the 50 MHz backscatter coherent radar set at São Luis, Brazil (SLZ, 2.3°S, 44.2°W) during the solar cycle 24. In this report we present the dependence of the vertical and zonal components of this electric field with the solar activity, based on the solar flux F10.7. For this study we consider the geomagnetically quiet days only (Kp ≤ 3+). A magnetic field‐aligned‐integrated conductivity model was developed for proving the conductivities, using the IRI‐2007, the MISIS‐2000, and the IGRF‐11 models as input parameters for ionosphere, neutral atmosphere, and Earth magnetic field, respectively. The ion‐neutron collision frequencies of all the species are combined through the momentum transfer collision frequency equation. The mean zonal component of the electric field, which normally ranged from 0.19 to 0.35 mV/m between the 8 and 18 h (LT) in the Brazilian sector, show a small dependency with the solar activity. Whereas the mean vertical component of the electric field, which normally ranges from 4.65 to 10.12 mV/m, highlights the more pronounced dependency of the solar flux.

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Daytime efficiency and characteristic time scale of interplanetary electric fields penetration to equatorial latitude ionosphere

Cited by 14 publications

References 18 publications

The Initial Steps for Developing the South American K Index From the Embrace Magnetometer Network

The Initial Steps for Developing the South American K Index From the Embrace Magnetometer Network

Equatorial Ionospheric Response to Different Estimated Disturbed Electric Fields as Investigated Using Sheffield University Plasmasphere Ionosphere Model at INPE

E region electric field dependence of the solar activity

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