EGU22-5961, updated on 28 Mar 2022
https://doi.org/10.5194/egusphere-egu22-5961
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Evidence for Presence of a Global Resonant Mode of Oscillations During High-Intensity Long-Duration Continuous AE Activity (HILDCAA) events

Diptiranjan Rout1, Ram Singh2, Kuldeep Pandey3, Tarun Pant4, Claudia Stolle5, Dibyendu Chakrabarty6, Smitha Thampi4, and Tikemani Bag7
Diptiranjan Rout et al.
  • 1GFZ German Research Centre for Geosciences, Geomagnetism, Potsdam, Germany (diptiprl89@gmail.com)
  • 2Dept. of Astronomy and Space Science, College of Natural Sciences, Chungnam National University Daejeon, South Korea
  • 3ISAS, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
  • 4Vikram Sarabhai Space Centre, Space Physics Laboratory, Thiruvananthapuram, India
  • 5Leibniz-Institute of Atmospheric Physics, Ku ̈hlungsborn, Germany
  • 6Physical Research Laboratory, Ahmedabad, India
  • 7Discipline of Physics, University of Kwazulu, Natal, Durban

The interaction between the Sun and the Earth defines the space environment of the Earth. This interaction is complex and exhibits various time scales ranging from a  few seconds to years. The High-Intensity Long-Duration Continuous AE Activity (HILDCAA) events are mainly the manifestations of the interactions of the corotating interaction regions (CIRs) with the terrestrial magnetosphere which continues for several days. The responses of two HILDCAA events are investigated by using solar wind observations at the L1 point, magnetospheric measurements at geosynchronous orbit, and changes in the global ionosphere. This study provides evidence of the existence of quasi-periodic oscillations (1.5-2hr) in the ionospheric electric field over low latitude, total electron content at high latitude, the magnetic field over the globe, energetic electron flux and magnetic field at geosynchronous orbit, geomagnetic indices (SYM-H, AE, and PC) and the Y-component of the interplanetary electric field (IEFy) during the HILDCAA events at all local times. Based on detailed wavelet and cross-spectrum analyses, it is shown that the periodic oscillations of 1.5-2hr in IEFy are the most effective one that controls the solar wind-magnetosphere-ionosphere coupling process during the  HILDCAA events for several days. Therefore, this investigation for the first time, shows that the  HILDCAA event affects the global magnetosphere-ionosphere system with a “resonant” mode of oscillation. These results are important not only to evaluate the solar wind-magnetosphere-ionosphere coupling process during the HILDCAA events but can also help to build up a forecasting strategy in the future.

How to cite: Rout, D., Singh, R., Pandey, K., Pant, T., Stolle, C., Chakrabarty, D., Thampi, S., and Bag, T.: Evidence for Presence of a Global Resonant Mode of Oscillations During High-Intensity Long-Duration Continuous AE Activity (HILDCAA) events, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-5961, https://doi.org/10.5194/egusphere-egu22-5961, 2022.

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