Preprints
https://doi.org/10.5194/angeo-2023-37
https://doi.org/10.5194/angeo-2023-37
04 Jan 2024
 | 04 Jan 2024
Status: this preprint is currently under review for the journal ANGEO.

Ionospheric Upwelling and the Level of Associated Noise at Solar Minimum

Timothy Wemimo David, Chizurumoke Michael Michael, Darren M. Wright, Adetoro Temitope Talabi, and Abayomi E. Ajetunmobi

Abstract. We have studied the ionospheric upwelling with magnitude above 1013 m−2 s−1 using the data during the IPY-ESR 2007 campaign, which coincides with 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 the low and medium categories are 62 % and 80 %, respectively. This shows that robust and stringent filtering techniques must be ensured when analysing incoherent data in order not to bias 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 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 – 18 LT and minimum around local noon.

Timothy Wemimo David, Chizurumoke Michael Michael, Darren M. Wright, Adetoro Temitope Talabi, and Abayomi E. Ajetunmobi

Status: open (until 03 Apr 2024)

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  • RC1: 'Comment on angeo-2023-37', Anonymous Referee #1, 26 Feb 2024 reply
Timothy Wemimo David, Chizurumoke Michael Michael, Darren M. Wright, Adetoro Temitope Talabi, and Abayomi E. Ajetunmobi
Timothy Wemimo David, Chizurumoke Michael Michael, Darren M. Wright, Adetoro Temitope Talabi, and Abayomi E. Ajetunmobi

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Short summary
The Earth’s upper atmospheres are dominated by matter also known as plasma. These plasmas can flow from the lower region, the ionosphere to the further up region of the upper atmosphere, the magnetosphere (and vice-versa), which is described as upwelling. We have analysed data for ionospheric upwelling over the solar minimum period. A main finding is that the noise or rejected data in the dataset was predominant around the local evening and in winter and minimum around local noon and in summer.