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Ionospheric upwelling and the level of associated noise at solar minimum.

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Title: Ionospheric upwelling and the level of associated noise at solar minimum.
Authors: David, Timothy Wemimo1,2 (AUTHOR), Michael, Chizurumoke Michael1,3 (AUTHOR) michael.michael@northampton.ac.uk, Wright, Darren1 (AUTHOR), Talabi, Adetoro Temitope2 (AUTHOR), Ajetunmobi, Abayomi Ekundayo2 (AUTHOR)
Source: Annales Geophysicae (ANGEO) (09927689). 2024, Vol. 42 Issue 2, p349-354. 6p.
Subject Terms: *Solar radio emission, *Incoherent scattering, *Noise, *Radar, *Seasons
Abstract: We have studied the ionospheric upwelling with a magnitude of above 1013 m -2 s -1 using the data during the European Incoherent Scatter Scientific Association (EISCAT) Svalbard Radar International Polar Year (IPY-ESR) 2007 campaign, which coincides with the solar minimum. The noise level in low-, medium- and high-flux upflows is investigated. We found that the noise level in high-flux upflow is about 93 %, while in the low and medium categories it is 62 % and 80 %, respectively. This shows that robust and stringent filtering techniques must be ensured when analysing incoherent data in order not to introduce bias to the result. Analysis reveals that the frequency of the low-flux upflow events is about 8 and 73 times the medium- and high-flux upflow events, respectively. Seasonal observation shows that the noise level in the upflow classes is predominantly high during winter. The noise is minimal in summer, with a notable result indicating occurrence of actual data above noise in the low-flux class. Moreover, the percentage occurrence of the noise level in the data increases with increasing flux strength, irrespective of the season. Further analysis reveals that the noise level in the local time variation peaked around 17:00–18:00 LT (local time) and minimum around 12:00 LT. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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  Data: Ionospheric upwelling and the level of associated noise at solar minimum.
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  Data: <searchLink fieldCode="AR" term="%22David%2C+Timothy Wemimo%22">David, Timothy Wemimo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Michael%2C+Chizurumoke Michael%22">Michael, Chizurumoke Michael</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> michael.michael@northampton.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Wright%2C+Darren%22">Wright, Darren</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Talabi%2C+Adetoro Temitope%22">Talabi, Adetoro Temitope</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ajetunmobi%2C+Abayomi Ekundayo%22">Ajetunmobi, Abayomi Ekundayo</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Annales+Geophysicae+%28ANGEO%29+%2809927689%29%22">Annales Geophysicae (ANGEO) (09927689)</searchLink>. 2024, Vol. 42 Issue 2, p349-354. 6p.
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  Data: *<searchLink fieldCode="DE" term="%22Solar+radio+emission%22">Solar radio emission</searchLink><br />*<searchLink fieldCode="DE" term="%22Incoherent+scattering%22">Incoherent scattering</searchLink><br />*<searchLink fieldCode="DE" term="%22Noise%22">Noise</searchLink><br />*<searchLink fieldCode="DE" term="%22Radar%22">Radar</searchLink><br />*<searchLink fieldCode="DE" term="%22Seasons%22">Seasons</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: We have studied the ionospheric upwelling with a magnitude of above 1013 m -2 s -1 using the data during the European Incoherent Scatter Scientific Association (EISCAT) Svalbard Radar International Polar Year (IPY-ESR) 2007 campaign, which coincides with the solar minimum. The noise level in low-, medium- and high-flux upflows is investigated. We found that the noise level in high-flux upflow is about 93 %, while in the low and medium categories it is 62 % and 80 %, respectively. This shows that robust and stringent filtering techniques must be ensured when analysing incoherent data in order not to introduce bias to the result. Analysis reveals that the frequency of the low-flux upflow events is about 8 and 73 times the medium- and high-flux upflow events, respectively. Seasonal observation shows that the noise level in the upflow classes is predominantly high during winter. The noise is minimal in summer, with a notable result indicating occurrence of actual data above noise in the low-flux class. Moreover, the percentage occurrence of the noise level in the data increases with increasing flux strength, irrespective of the season. Further analysis reveals that the noise level in the local time variation peaked around 17:00–18:00 LT (local time) and minimum around 12:00 LT. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=182193883
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.5194/angeo-42-349-2024
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 349
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      – SubjectFull: Solar radio emission
        Type: general
      – SubjectFull: Incoherent scattering
        Type: general
      – SubjectFull: Noise
        Type: general
      – SubjectFull: Radar
        Type: general
      – SubjectFull: Seasons
        Type: general
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      – TitleFull: Ionospheric upwelling and the level of associated noise at solar minimum.
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            NameFull: Ajetunmobi, Abayomi Ekundayo
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              M: 07
              Text: 2024
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