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Title: An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF Bz condition

Abstract

Before the onset of a geomagnetic storm on 22 January 2012 (Ap = 24), an enhancement in solar wind number density from 10/cm3 to 22/cm3 during 0440–0510 UT under northward interplanetary magnetic field (IMF Bz) condition is shown to have enhanced the high-latitude ionospheric convection and also caused variations in the geomagnetic field globally. Some conspicuous changes in ΔX are observed not only at longitudinally separated low-latitude stations over Indian (prenoon), South American (midnight), Japanese (afternoon), Pacific (afternoon) and African (morning) sectors but also at latitudinally separated stations located over high and middle latitudes. The latitudinal variation of the amplitude of the ΔX during 0440–0510 UT is shown to be consistent with the characteristics of prompt penetration electric field disturbances. Most importantly, the density pulse event caused enhancements in the equatorial electrojet strength and the peak height of the F layer (hmF2) over the Indian dip equatorial sector. Furthermore, the concomitant enhancements in electrojet current and F layer movement over the dip equator observed during this space weather event suggest a common driver of prompt electric field disturbance at this time. Such simultaneous variations are found to be absent during magnetically quiet days. In the absence of significant change inmore » solar wind velocity and magnetospheric substorm activity, these observations point toward perceptible prompt electric field disturbance over the dip equator driven by the overcompression of the magnetosphere by solar wind density enhancement.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2];  [3];  [4];  [5];  [6]
  1. Physical Research Lab., Ahmedabad (India)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Bradley Dept. of Electrical and Computer Engineering
  4. Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram (India). Space Physics Lab.
  5. Indian Inst. of Geomagnetism, Navi Mumbai (India)
  6. Nagoya Univ., Nagoya (Japan). Inst. for Space-Earth Environmental Research (ISEE)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1402593
Alternate Identifier(s):
OSTI ID: 1572320
Report Number(s):
LA-UR-15-27240; LA-UR-17-28048
Journal ID: ISSN 2169-9380; TRN: US1702998
Grant/Contract Number:  
AC52-06NA25396; 89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 5; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics

Citation Formats

Rout, Diptiranjan, Chakrabarty, D., Sekar, R., Reeves, G. D., Ruohoniemi, J. M., Pant, Tarun K., Veenadhari, B., and Shiokawa, K. An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF Bz condition. United States: N. p., 2016. Web. doi:10.1002/2016JA022475.
Rout, Diptiranjan, Chakrabarty, D., Sekar, R., Reeves, G. D., Ruohoniemi, J. M., Pant, Tarun K., Veenadhari, B., & Shiokawa, K. An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF Bz condition. United States. doi:10.1002/2016JA022475.
Rout, Diptiranjan, Chakrabarty, D., Sekar, R., Reeves, G. D., Ruohoniemi, J. M., Pant, Tarun K., Veenadhari, B., and Shiokawa, K. Thu . "An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF Bz condition". United States. doi:10.1002/2016JA022475. https://www.osti.gov/servlets/purl/1402593.
@article{osti_1402593,
title = {An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF Bz condition},
author = {Rout, Diptiranjan and Chakrabarty, D. and Sekar, R. and Reeves, G. D. and Ruohoniemi, J. M. and Pant, Tarun K. and Veenadhari, B. and Shiokawa, K.},
abstractNote = {Before the onset of a geomagnetic storm on 22 January 2012 (Ap = 24), an enhancement in solar wind number density from 10/cm3 to 22/cm3 during 0440–0510 UT under northward interplanetary magnetic field (IMF Bz) condition is shown to have enhanced the high-latitude ionospheric convection and also caused variations in the geomagnetic field globally. Some conspicuous changes in ΔX are observed not only at longitudinally separated low-latitude stations over Indian (prenoon), South American (midnight), Japanese (afternoon), Pacific (afternoon) and African (morning) sectors but also at latitudinally separated stations located over high and middle latitudes. The latitudinal variation of the amplitude of the ΔX during 0440–0510 UT is shown to be consistent with the characteristics of prompt penetration electric field disturbances. Most importantly, the density pulse event caused enhancements in the equatorial electrojet strength and the peak height of the F layer (hmF2) over the Indian dip equatorial sector. Furthermore, the concomitant enhancements in electrojet current and F layer movement over the dip equator observed during this space weather event suggest a common driver of prompt electric field disturbance at this time. Such simultaneous variations are found to be absent during magnetically quiet days. In the absence of significant change in solar wind velocity and magnetospheric substorm activity, these observations point toward perceptible prompt electric field disturbance over the dip equator driven by the overcompression of the magnetosphere by solar wind density enhancement.},
doi = {10.1002/2016JA022475},
journal = {Journal of Geophysical Research. Space Physics},
number = 5,
volume = 121,
place = {United States},
year = {2016},
month = {5}
}

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