Department 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.
This preprint has been withdrawn.
How to cite. Nasuddin, K. A., Abdullah, M., and Abdul Hamid, N. S.: Investigation on the characteristics of the South Atlantic Anomaly, Nonlin. Processes Geophys. Discuss. [preprint], https://doi.org/10.5194/npg-2021-23, 2021.
Received: 23 Jun 2021 – Discussion started: 29 Jun 2021
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.
In this research, the South Atlantic Anomaly (SAA), the middle latitude and the high latitude...
This paper analysed the temporal characteristics of the SAA using ground magnetometer observations during both quiet and active solar conditions. The authors, using the Hurst exponent, claimed the SAA to be persistent because of the ring current. In addition, they repeated the same analysis out of SAA using middle and high latitudes ground stations finding: a mixture of persistence and anti-persistence at mid-latitudes; anti-persistence at high latitudes. They explained such features as a consequence of plasma and seasonal weather variations for mid-latitudes and of the influence of the geomagnetic storm and aurora for high latitudes.
In my opinion, despite the analysis can be potentially interesting, the paper shows too qualitative conclusions. The authors should try to explain their conclusions adding some data analysis. For example, they could use magnetospheric satellite magnetic data to confirm their conclusion about the role played by the ring current in causing the SAA persistence. The same for other latitude out of the SAA.
For this reason the manuscript is not acceptable in the present form.