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Enhancement and modulation of cosmic noise absorption in the afternoon sector at subauroral location ( L = 5) during the recovery phase of 17 March 2015 geomagnetic storm

Behera, Jayanta K. and Sinha, Ashwini K. and Vichare, Geeta and Bhaskar, Ankush and Honary, Farideh and Rawat, Rahul and Singh, Rajesh (2017) Enhancement and modulation of cosmic noise absorption in the afternoon sector at subauroral location ( L = 5) during the recovery phase of 17 March 2015 geomagnetic storm. Journal of Geophysical Research: Space Physics, 122 (9). pp. 9528-9544. ISSN 2169-9380

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      Abstract

      The present study has focused on the intense production of cosmic noise absorption (CNA) at Maitri, Antarctica (L = 5; CGM −62°S, 55°E) during the early recovery phase of the largest storm of the current solar cycle commenced on 17 March 2015 St. Patrick's Day. The enhancement of CNA during 15–18 UT (14–17 magnetic local time (MLT); MLT = UT − 1 at Maitri) was as large as the CNA enhancement occurred during the main phase of the storm. During this time the CNA pattern also exhibits oscillation in the Pc5 (2–7 mHz) range and is in simultaneity with geomagnetic pulsations in the same frequency range. We observed the amplitude of CNA pulsation is well correlated with the level of CNA production. High-amplitude Pc5 oscillations were observed in the vicinity of auroral oval near Maitri. Absence of electromagnetic ion cyclotron (EMIC) waves is marked suggesting the possible role of VLF waves in precipitation. The reason for the intense CNA production is found to be the precipitation caused mainly by hiss-driven subrelativistic electrons. The CNA enhancement event is located well inside the dusk plasmaspheric bulge region as suggested by Tsurutani et al. (2015). Signature of enhanced eastward electrojet at Maitri during 14–17 MLT could be an additional factor for such large CNA. In order to establish the cause and effect relationship between the geomagnetic and CNA oscillations at Maitri, transfer entropy method has been used, which confirmed the modulation of CNA by geomagnetic pulsations.

      Item Type: Journal Article
      Journal or Publication Title: Journal of Geophysical Research: Space Physics
      Additional Information: ©2017. American Geophysical Union. All Rights Reserved. This is the peer reviewed version of the following article: Behera, J. K., A. K. Sinha, G. Vichare, A. T. Bhaskar, F. Honary, R. Rawat, and R. Singh (2017), Enhancement and modulation of cosmic noise absorption in the afternoon sector at subauroral location (L = 5) during the recovery phase of 17 March 2015 geomagnetic storm, J. Geophys. Res. Space Physics, 122, doi:10.1002/2017JA024226. which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/2017JAO24226/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
      Uncontrolled Keywords: imaging riometer VLF-hiss geomagnetic pulsation transfer entropy method wave-particle interaction auroral electrojets Energetic particles: trapped Ring current Auroral phenomena Magnetosphere/ionosphere interactions
      Subjects:
      Departments: Faculty of Science and Technology > Physics
      ID Code: 88236
      Deposited By: ep_importer_pure
      Deposited On: 16 Oct 2017 12:00
      Refereed?: Yes
      Published?: Published
      Last Modified: 16 Oct 2018 05:22
      Identification Number:
      URI: http://eprints.lancs.ac.uk/id/eprint/88236

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