Preprints
https://doi.org/10.5194/npg-2021-23
https://doi.org/10.5194/npg-2021-23

  29 Jun 2021

29 Jun 2021

Review status: this preprint is currently under review for the journal NPG.

Investigation on the characteristics of the South Atlantic Anomaly

Khairul Afifi Nasuddin1, Mardina Abdullah1,2, and Nurul Shazana Abdul Hamid3 Khairul Afifi Nasuddin et al.
  • 1Department of Electrical, Electronic and Systems Engineering, Universiti Kebangsaan Malaysia, Bangi, 43600, Malaysia
  • 2Space Science Center (ANGKASA), Institute of Climate Change, Universiti Kebangsaan Malaysia, Bangi, 43600, Malaysia
  • 3Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, 43600, Malaysia

Abstract. The South Atlantic Anomaly (SAA) is known for its weak Earth’s magnetic field strength. In this research, power spectrum analysis method was applied on the Horizontal intensity of the Earth’s magnetic field with data sample rate used at 1 min. Four active periods on 18 March 2012, 10 March 2012, 25 April 2012, and 30 June 2013 which represent the occurrence of geomagnetic storms and 4 normal periods on 25 March 2012, 21 March 2012, 4 April 2012, and 15 June 2013 which indicate no geomagnetic storm event were examined. Research was conducted by analyzing the SAA region where comparisons were made between the middle latitude region and the high latitude region. The results indicate that the SAA region tends to be persistent, and this may be due to the ring current. The middle latitude region experienced a mixture of persistent and antipersistent characteristics and this may be due to the transportation of plasma and seasonal weather variations. The high latitude region tends to be antipersistent. This may indicate that the high latitude region is influenced by geomagnetic storms and the aurora.

Khairul Afifi Nasuddin et al.

Status: open (until 25 Aug 2021)

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Khairul Afifi Nasuddin et al.

Khairul Afifi Nasuddin et al.

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Short summary
In this research, the South Atlantic Anomaly (SAA), the middle latitude and the high latitude region is analyzed. The method apply is using power spectrum analysis method and 4 active period (Period during occurrence of geomagnetic storm) and 4 normal period (Period during no occurrence of geomagnetic storm) is examine. The result indicate SAA region tend to be persistent during both period in comparison to other region in this research. The SAA region may be influence by the ring current.