Multi-station observation of ionospheric disturbance of March 9 2012 and comparison with IRI-model

Adebesin, B.O.; Ikubanni, S.O.; Adebiyi, S.J.; Joshua, B.W.

doi:10.1016/j.asr.2013.05.002

Cited by 19 publications

(13 citation statements)

References 13 publications

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“…The results agree well with the known electron density profile. Furthermore, several works have been carried out using SPIDR data, and their results are well documented and published [e.g., Adebesin et al, 2013b]. The SPIDR is designed to allow researchers in the field of solar-terrestrial physics to intelligently annex historical space physics data for knowledge generation, space weather forecast, and incorporation with environment models.…”

Section: Methods Of Data Analysismentioning

confidence: 99%

Ionospheric vertical plasma drift and electron density response during total solar eclipses at equatorial/low latitude

2015

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The response of the vertical plasma drift (Vz) and the electron density (NmF2) during different solar eclipses was investigated. The diurnal values of the direct scaled measurement of F2 peak height and the one derived from M(3000) F2 data, acquired over an equatorial/low‐latitude stations, have been used to determine the vertical plasma drift. The ionosphere during a solar eclipse is significantly affected by the E × B vertical drift; the large depletion of electron density at low altitudes can be transported to high altitudes through the plasma vertical drift. The loss in ionization density during the eclipse phase decreases the electron density, which was accompanied by rapid increase in hmF2. This deviation in the NmF2 during eclipse compared to control days can be related to the increase in the loss rate due to recombination, as a result of reduction in thermal energy. However, the maximum reduction in NmF2 is not synchronous with the time of maximum totality but some minutes later. The differences in the solar epochs may contribute to the observed relative changes in the ionospheric F2 region behavior during the eclipse window. Lastly, it is very difficult to separate the influence of magnetic disturbances from solar eclipse. The deviation in NmF2 is higher during magnetic disturbed days than the quiet day. The reverse is the case for hmF2 observation. However, the NmF2 variation increases with an increase in solar activity.

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Section: Methods Of Data Analysismentioning

confidence: 99%

Ionospheric vertical plasma drift and electron density response during total solar eclipses at equatorial/low latitude

2015

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“…On the other hand, geomagnetic activities originate as a consequence of the interaction between the solar wind and the magnetosphere (e.g. Kamide 1988;Adebesin and Chukwuma 2008;Adebesin et al 2013b). Current systems that emanates from the continuous normal changes in solar radiation have been adjudged to be the main factor in the creation of Sq geomagnetic field variations (e.g.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the linear relationship between the AE, Dst and ap indices during different magnetic and solar activity conditions

Adebesin

2015

Acta Geod Geophys

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There are numerous geomagnetic indices used in monitoring various magnetospheric and ionospheric phenomena. Some of the most widely used indices are the ap, AE and Dst. In this work, the relationship between these three geomagnetic indices is investigated at different levels of solar and magnetic activity. 3-h average data spanning 8-years were used-high (HSA), moderate (MSA) and low solar activity (LSA) periods cover the years 1999-2001, 2004-2005, and 2006, 2009-2010 respectively. All the investigated correlation pairs recorded the highest/lowest during the LSA/HSA periods. The ap/AE correlation was found to be highest ranging within 70-78 % at any solar activity. The ap versus AE and Dst multiple correlation reached 94.0, 92.1, and 89.2 % for HSA, MSA, and LSA conditions, respectively, and 72.1, 83.3, and 80.0 % for the main phase, recovery phase and quiet conditions respectively. Moreover, higher percentage correlations were observed for the ap/AE pair at any geomagnetic conditions than for the ap/Dst and AE/Dst pairs. The ring current index Dst is observed to have a greater influence on ap during geomagnetic storm periods.

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“…The results show that the TEC response to storm activity depends on latitude and season. Past studies have explained the ionospheric response to geomagnetic disturbances to some physical processes such as the electric fields, the neutral composition change, the dynamo effect, the thermospheric winds flow, the traveling atmospheric disturbances (TADs) and so on (ABDU 2012;SUTTON et al 2005;ADEBESIN et al 2013;ADEBIYI et al 2014a, b;JOSHUA et al 2011JOSHUA et al , 2014aSCHER-LIESS and FEJER 1997;LEE et al 2004). However, the effects of these physical processes may vary with latitude, season and local time (CHAKRABORTY and HAJRA 2010;ADEBIYI et al 2014b, STANKOV et al 2010TSURUTANI et al 2004;GAO et al 2008;MAN-NUCCI et al 2005), and this has been used to explain some of the observations in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Over the years, researches to understand the variability and complexity of the ionospheric environments during this solar event have been given much attention, with a large number of studies conducted at different latitudes using data from different ionospheric probing techniques (e.g. RAWAT et al 2010;MANSILLA 2014;HASBI et al 2009;CHOI et al 2011;BAGIYA et al 2009;ADEBIYI et al 2012;JOSHUA et al 2011, JAKOWSKI et al 1999FANG et al 2012;UMA et al 2012;ADEBESIN et al 2013). The ionospheric variations, due to geomagnetic storm, can be described by the enhancement or depletion of ionospheric electron content, designated as positive and negative storm effects, respectively, or a combination of both effects.…”

Section: Introductionmentioning

confidence: 99%

Latitudinal and Seasonal Investigations of Storm-Time TEC Variation

Adimula

Oladipo

Adebiyi

2016

Pure Appl. Geophys.

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The ionosphere responds markedly and unpredictably to varying magnetospheric energy inputs caused by solar disturbances on the geospace. Knowledge of the impact of the space weather events on the ionosphere is important to assess the environmental effect on the operations of ground-and space-based technologies. Thus, global positioning system (GPS) measurements from the international GNSS service (IGS) database were used to investigate the ionospheric response to 56 geomagnetic storm events at six different latitudes comprising the northern and southern hemispheres in the Afro-European sector. Statistical distributions of total electron content (TEC) response show that during the main phase of the storms, enhancement of TEC is more pronounced in most of the seasons, regardless of the latitude and hemisphere. However, a strong seasonal dependence appears in the TEC response during the recovery phase. Depletion of TEC is majorly observed at the high latitude stations, and its appearance at lower latitudes is seasonally dependent. In summer hemisphere, the depletion of TEC is more pronounced in nearly all the latitudinal bands. In winter hemisphere, enhancement as well as depletion of TEC is observed over the high latitude, while enhancement is majorly observed over the mid and low latitudes. In equinoxes, the storm-time TEC distribution shows a fairly consistent characteristic with the summer distribution, particularly in the northern hemisphere.

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Multi-station observation of ionospheric disturbance of March 9 2012 and comparison with IRI-model

Cited by 19 publications

References 13 publications

Ionospheric vertical plasma drift and electron density response during total solar eclipses at equatorial/low latitude

Ionospheric vertical plasma drift and electron density response during total solar eclipses at equatorial/low latitude

Investigation into the linear relationship between the AE, Dst and ap indices during different magnetic and solar activity conditions

Latitudinal and Seasonal Investigations of Storm-Time TEC Variation

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