Day-to-day variability of VTEC and ROTI in october 2012 with impact of high-speed solar wind stream on 13 october 2012


AZZOUZI Ilyasse2,3, MIGOYA-ORUE Yenca4, COÏSSON Pierdavide5, AMORY-MAZAUDIER Christine2,4, FLEURY Rolland1,6, RADICELLA Sandro Maria4

Type de document

Article de revue avec comité de lecture


Sun and geosphere : the international journal of research and applications, march 2016, vol. 11, n° 1, pp. 7-22




This paper presents the day-to-day variability of the Vertical Total Electron Content (VTEC) and the Rate of change of TEC Index (ROTI) in October 2012. We focused our attention to the impact of a high-speed solar wind stream (HSSWS) on the ionosphere in middle and low latitudes on 13 October 2012. This event was preceded by two other disturbances caused by a Coronal Mass Ejection (CME) at 05:26UT on 8 October and a HSSWS around 19:00UT on 9 October. The changes in the VTEC observed during the period between 8 and 12 October preceding the 13 October case showed a comparable response of the ionosphere in both hemispheres, varying mainly with latitude and presenting a stronger impact in the Northern hemisphere. The VTEC increased at the arrival of the CME on 8 October, then decreased, and increased again on 13 October. The solar wind speed associated with the second HSSWS reached its peak, 580 km/s around 17:00UT during the recovery phase of a geomagnetic storm started around 00:00UT on 13 October. Its impact was observed in Africa and in Eastern South America on the ROTI, an indicator of ionospheric scintillation. On 13 October, the ROTI was small over whole Africa and in Eastern South America at the moment the impact of the second HSSWS. These observations are interpreted as due to the ionospheric disturbance dynamo electric field associated with the Joule heating produced in the auroral zone by the HSSWS.


1 : MO(TB) - Dépt. Micro-Ondes (Institut Mines-Télécom-Télécom Bretagne-UEB)
2 : LPP - Laboratoire de Physique des Plasmas (CNRS - Université Paris Sud-Paris 11 - Université Pierre et Marie Curie-Paris 6 - Ecole Polytechnique-X)
3 : EMI - Ecole Mohammadia d'Ingénieurs (Université Mohammed V)
4 : ICTP - International Center for Theoretical Physics (.)
5 : IPGP - Institut de Physique du globe de Paris (Université Paris Diderot - Paris 7)
6 : Lab-STICC(TB) - Laboratoire en sciences et technologies de l'information, de la communication et de la connaissance (UMR CNRS 6285 - Télécom Bretagne - Université de Bretagne Occidentale - Université de Bretagne Sud - ENSTA Bretagne - Ecole Nationale d'ingénieurs de Brest)



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