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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 19 Jun 2018

Regular paper | 19 Jun 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Singular variations in geomagnetic disturbance content at auroral latitudes

Abraham Abraham1,2, Gangadharan Renuka2, Cherian Ligi1, Joseph Mathew Tiju1,2, Anie Varghese Asha3, S. B. Chandran Rakesh2,4, and Varghese Blessy1 Abraham Abraham et al.
  • 1Department of Physics, Christian College, Chengannur, Kerala, India
  • 2Department of Physics, University of Kerala, Trivandrum, Kerala, India
  • 3Department of Physics, SH College, Thevara, Kochi, Kerala, India
  • 4Department of Physics, SD College, Alleppey, Kerala, India

Abstract. The geomagnetic field consists of temporal variations induced primarily by the variations in the interplanetary magnetic field. This paper attempts to develop the latitude profile of fluctuations in the geomagnetic field for 34 observatories across the Earth during solar cycle 23 (1997–2008). It is noticed that the disturbance content is low for equatorial stations and high for auroral stations. We show that the latitude profile of disturbance exhibits `Knee’ behaviour, with the fluctuation content rising sharply beyond this critical latitude. The threshold latitude beyond which the stations are subject to high geomagnetic disturbance and hence become increasingly susceptible to associated geo-electric hazard is precisely determined near 52° latitude. The pattern of increasing geomagnetic fluctuations however ends around the auroral oval beyond where singular variations are observed.

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Short summary
The disturbance in geomagnetic field is quantified using the newly introduced Vertical Variance (VV) method. Latitude profile of geomagnetic disturbance for 34 stations across the Earth is developed. The latitude profile developed is employed to determine the latitudes which are subject to high geomagnetic disturbance. The geomagnetic disturbance however falls singularly at the auroral latitudes. This singular variation is explored and investigated.
The disturbance in geomagnetic field is quantified using the newly introduced Vertical Variance...