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Littérature scientifique sur le sujet « Counter equatorial electrojet »

Auteur : Grafiati

Publié le 6 septembre 2023

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Articles de revues sur le sujet "Counter equatorial electrojet"

Sastry, T. S., et S. V. S. Sarma. « Equatorial Counter-Electrojet and Magnetic Pulsations. » Journal of geomagnetism and geoelectricity 49, n^o 10 (1997) : 1247–51. http://dx.doi.org/10.5636/jgg.49.1247.

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Rastogi, R. G. « Meridional equatorial electrojet current in the American sector ». Annales Geophysicae 17, n^o 2 (28 février 1999) : 220–30. http://dx.doi.org/10.1007/s00585-999-0220-4.

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Abstract. Huancayo is the only equatorial electrojet station where the daytime increase of horizontal geomagnetic field (H) is associated with a simultaneous increase of eastward geomagnetic field (Y). It is shown that during the counter electrojet period when ∆H is negative, ∆Y also becomes negative. Thus, the diurnal variation of ∆Y at equatorial latitudes is suggested to be a constituent part of the equatorial electrojet current system. Solar flares are known to increase the H field at an equatorial station during normal electrojet conditions (nej). At Huancayo, situated north of the magnetic equator, the solar flare effect, during nej, consists of positive impulses in H and Y and negative impulse in Z field. During counter electrojet periods (cej), a solar flare produces a negative impulse in H and Y and a positive impulse in Z at Huancayo. It is concluded that both the zonal and meridional components of the equatorial electrojet in American longitudes, as in Indian longitudes, flows in the same, E region of the ionosphere.Key words. Geomagnetism and paleomagnetism (dynamo theories) · Ionosphere (equatorial ionosphere; ionosphere disturbances)

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Akiyama, T., A. Yoshikawa, A. Fujimoto et T. Uozumi. « Relationship between plasma bubble and ionospheric current, equatorial electrojet, and equatorial counter electrojet ». Journal of Physics : Conference Series 1152 (janvier 2019) : 012022. http://dx.doi.org/10.1088/1742-6596/1152/1/012022.

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Rastogi, R. G. « Morphological aspects of a new type of counter electrojet event ». Annales Geophysicae 17, n^o 2 (28 février 1999) : 210–19. http://dx.doi.org/10.1007/s00585-999-0210-6.

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Abstract. The study describes the time and space morphologies of a rather new type of counter electrojet event on the basis of data from the excellent chain of magnetic and ionospheric observatories along the Indo-Russian longitude sector. Abnormally large westward currents are observed during almost the whole of the daytime hours on a series of days. These events do not form any vortices in the current system and do not apparently seem to be associated with tidal effects or any solar magnetosphere events or geomagnetic disturbances. The existence of a westward electric field over the equatorial ionosphere has been confirmed by the absence of an equatorial type of sporadic E in the ionograms at Thumba precisely during the periods when ∆H at Trivandrum minus ∆H at Alibag is negative. The equatorial F region anomaly was also absent on the counter electrojet day. Such counter electrojet events during the northern winter months of low solar activity years are suggested to be the result of the modified wind system in the ionosphere associated with stratospheric warming events.Key words. Geomagnetism and paleomagnetism (time variations · diurnal to secular) · Ionosphere (electric fields and currents; equatorial ionosphere)

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Rabiu, A. Babatunde, Olanike Olufunmilayo Folarin, Teiji Uozumi, Nurul Shazana Abdul Hamid et Akimasa Yoshikawa. « Longitudinal variation of equatorial electrojet and the occurrence of its counter electrojet ». Annales Geophysicae 35, n^o 3 (7 avril 2017) : 535–45. http://dx.doi.org/10.5194/angeo-35-535-2017.

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Abstract. We examined the longitudinal variability of the equatorial electrojet (EEJ) and the occurrence of its counter electrojet (CEJ) using the available records of the horizontal component H of the geomagnetic field simultaneously recorded in the year 2009 (mean annual sunspot number Rz = 3.1) along the magnetic equator in the South American, African, and Philippine sectors. Our results indicate that the EEJ undergoes variability from one longitudinal representative station to another, with the strongest EEJ of about 192.5 nT at the South American axis at Huancayo and a minimum peak of 40.7 nT at Ilorin in western Africa. Obtained longitudinal inequality in the EEJ was explicable in terms of the effects of local winds, dynamics of migratory tides, propagating diurnal tide, and meridional winds. The African stations of Ilorin and Addis Ababa registered the greatest % of CEJ occurrence. Huancayo in South America, with the strongest electrojet strength, was found to have the least occurrence of the CEJ. It is suggested that activities that support strong EEJ inhibits the occurrence of the CEJ. Percentage of occurrence of the CEJ varied with seasons across the longitudes. The order of seasonal variation of morning occurrence does not tally with the evening occurrence order at any station. A semiannual equinoctial maximum in percentage of morning occurrence of the CEJ was obtained at Huancayo and Addis Ababa. Only Addis Ababa recorded equal equinoctial maxima in percentage of evening occurrence of the CEJ. The seasonal distribution of the occurrences of the CEJ at different time regimes implies a seasonal variability of causative mechanisms responsible for the occurrence of the CEJ.

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Mengistu, Endalkachew, et Tsegaye Kassa. « Temporal characteristics of the Equatorial Electrojet and Counter Electrojet over Ethiopian sector ». Advances in Space Research 55, n^o 2 (janvier 2015) : 566–75. http://dx.doi.org/10.1016/j.asr.2014.10.031.

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Somayajulu, V. V., K. S. Viswanathan, K. S. V. Subbarao et L. Cherian. « Distortions in the height structure of the equatorial electrojet during counter electrojet events ». Journal of Atmospheric and Terrestrial Physics 56, n^o 1 (janvier 1994) : 51–58. http://dx.doi.org/10.1016/0021-9169(94)90175-9.

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Denardini, C. M., M. A. Abdu, H. C. Aveiro, L. C. A. Resende, P. D. S. C. Almeida, Ê. P. A. Olívio, J. H. A. Sobral et C. M. Wrasse. « Counter electrojet features in the Brazilian sector : simultaneous observation by radar, digital sounder and magnetometers ». Annales Geophysicae 27, n^o 4 (3 avril 2009) : 1593–603. http://dx.doi.org/10.5194/angeo-27-1593-2009.

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Abstract. In the present work we show new results regarding equatorial counter electrojet (CEJ) events in the Brazilian sector, based on the RESCO radar, two set of fluxgate magnetometer systems and a digital sounder. RESCO radar is a 50 MHz backscatter coherent radar installed in 1998 at São Luís (SLZ, 2.33° S, 44.60° W), an equatorial site. The Digital sounder routinely monitors the electron density profile at the radar site. The magnetometer systems are fluxgate-type installed at SLZ and Eusébio (EUS, 03.89° S, 38.44° W). From the difference between the horizontal component of magnetic field at SLZ station and the same component at EUS (EEJ ground strength) several cases of westward morning electrojet and its normal inversion to the eastward equatorial electrojet (EEJ) have been observed. Also, the EEJ ground strength has shown some cases of CEJ events, which been detected with the RESCO radar too. Detection of these events were investigated with respect to their time and height of occurrence, correlation with sporadic E (Es) layers at the same time, and their spectral characteristics as well as the radar echo power intensity.

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Bolaji, Olawale, Oluwafisayo Owolabi, Elijah Falayi, Emmanuel Jimoh, Afolabi Kotoye, Olumide Odeyemi, Babatunde Rabiu et al. « Observations of equatorial ionization anomaly over Africa and Middle East during a year of deep minimum ». Annales Geophysicae 35, n^o 1 (20 janvier 2017) : 123–32. http://dx.doi.org/10.5194/angeo-35-123-2017.

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Abstract. In this work, we investigated the veracity of an ion continuity equation in controlling equatorial ionization anomaly (EIA) morphology using total electron content (TEC) of 22 GPS receivers and three ground-based magnetometers (Magnetic Data Acquisition System, MAGDAS) over Africa and the Middle East (Africa–Middle East) during the quietest periods. Apart from further confirmation of the roles of equatorial electrojet (EEJ) and integrated equatorial electrojet (IEEJ) in determining hemispheric extent of EIA crest over higher latitudes, we found some additional roles played by thermospheric meridional neutral wind. Interestingly, the simultaneous observations of EIA crests in both hemispheres of Africa–Middle East showed different morphology compared to that reported over Asia. We also observed interesting latitudinal twin EIA crests domiciled at the low latitudes of the Northern Hemisphere. Our results further showed that weak EEJ strength associated with counter electrojet (CEJ) during sunrise hours could also trigger twin EIA crests over higher latitudes.

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Gurubaran, S. « The equatorial counter electrojet : Part of a worldwide current system ? » Geophysical Research Letters 29, n^o 9 (mai 2002) : 51–1. http://dx.doi.org/10.1029/2001gl014519.

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Chapitres de livres sur le sujet "Counter equatorial electrojet"

Onwumechili, C. Agodi. « Quiet Time Counter Equatorial Electrojet ». Dans The Equatorial Electrojet, 371–414. Routledge, 2019. http://dx.doi.org/10.1201/9780203756706-6.

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