Dayside magnetospheric and ionospheric responses to a foreshock transient on 25 June 2008: 2. 2-D evolution based on dayside auroral imaging

The foreshock region involves localized and transient structures such as foreshock cavities and hot flow anomalies due to solar wind-bow shock interactions, and foreshock transients have been shown to lead to magnetospheric and ionospheric responses. In this paper, the interaction between a foreshock transient and the magnetosphere-ionosphere system is investigated using dayside aurora imagers revealing structures and propagation in greater detail than previously possible. A foreshock transient was detected by Time History of Events and Macroscale Interactions during Substorms B and C during 1535-1545 UT on 25 June 2008. Time History of Events and Macroscale Interactions during Substorms A, D, and E observed magnetopause compression, cold plasma enhancement, and ultralow frequency waves in the dayside magnetosphere. The all-sky imager at South Pole observed that both diffuse and discrete aurora brightened locally soon after the appearance of this foreshock transient. The diffuse aurora brightening, which corresponded to a region a few Re size in geocentric solar magnetospheric Y in the equatorial plane, propagated duskward with an average speed of similar to 100km/s. Soon after the diffuse aurora brightened, discrete aurora also brightened and extended duskward, which was consistent with the motion of the foreshock transient as it swept through the magnetosheath while impacting the magnetopause. Equivalent horizontal currents measured by magnetometers revealed a pair of field-aligned currents moving duskward consistent with motion of the discrete aurora patterns. We conclude that the high-resolution and two-dimensional observation of auroral responses by ground-based all-sky imager can help to estimate the evolution and propagation of upstream foreshock transients and their substantial impacts on the magnetosphere-ionosphere coupling system, including magnetospheric compression and currents in the ionosphere.

To Access Resource:

Questions? Email Resource Support Contact:

  • opensky@ucar.edu
    UCAR/NCAR - Library

Resource Type publication
Temporal Range Begin N/A
Temporal Range End N/A
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links N/A
Additional Information N/A
Resource Format PDF
Standardized Resource Format PDF
Asset Size N/A
Legal Constraints

Copyright 2018 American Geophysical Union.


Access Constraints None
Software Implementation Language N/A

Resource Support Name N/A
Resource Support Email opensky@ucar.edu
Resource Support Organization UCAR/NCAR - Library
Distributor N/A
Metadata Contact Name N/A
Metadata Contact Email opensky@ucar.edu
Metadata Contact Organization UCAR/NCAR - Library

Author Wang, Boyi
Nishimura, Yukitoshi
Hietala, Heli
Shen, Xiao-Chen
Shi, Quanqi
Zhang, Hui
Lyons, Larry
Zou, Ying
Angelopoulos, Vassilis
Ebihara, Yusuke
Weatherwax, Allan
Publisher UCAR/NCAR - Library
Publication Date 2018-08-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier N/A
Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2023-08-18T19:20:51.307871
Metadata Record Identifier edu.ucar.opensky::articles:22032
Metadata Language eng; USA
Suggested Citation Wang, Boyi, Nishimura, Yukitoshi, Hietala, Heli, Shen, Xiao-Chen, Shi, Quanqi, Zhang, Hui, Lyons, Larry, Zou, Ying, Angelopoulos, Vassilis, Ebihara, Yusuke, Weatherwax, Allan. (2018). Dayside magnetospheric and ionospheric responses to a foreshock transient on 25 June 2008: 2. 2-D evolution based on dayside auroral imaging. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7r2149q. Accessed 10 February 2025.

Harvest Source