TY - JOUR

T1 - The influence of magnetospheric substorms on SuperDARN radar backscatter

AU - Wild, James A.

AU - Grocott, A.

N1 - Copyright (2008) American Geophysical Union. Further reproduction or electronic distribution is not permitted

PY - 2008/4

Y1 - 2008/4

N2 - The SuperDARN ionospheric radar network is a leading tool for investigating the near-Earth space environment. However, reductions in ionospheric backscatter have been reported during magnetospheric substorms. We have therefore investigated the impact of substorms upon SuperDARN backscatter during 3005 substorms and find that the global level of scatter maximizes just prior to substorm onset. In the nightside ionosphere, backscatter poleward of ∼70° magnetic latitude is reduced, with radar echoes shifting to lower latitudes. An examination into the frequency-dependence of nightside backscatter evolution during substorms reveals that although most backscatter data is based upon operations in the 08–14 MHz range, higher operating frequencies may offer improved performance in the period just prior to and immediately following expansion phase onset. We suggest that the SuperDARN array of high-frequency coherent-scatter radars, and in particular those radars with the ability to simultaneously operate at dual frequencies, will play a key role in future space- and ground-based studies of substorms.

AB - The SuperDARN ionospheric radar network is a leading tool for investigating the near-Earth space environment. However, reductions in ionospheric backscatter have been reported during magnetospheric substorms. We have therefore investigated the impact of substorms upon SuperDARN backscatter during 3005 substorms and find that the global level of scatter maximizes just prior to substorm onset. In the nightside ionosphere, backscatter poleward of ∼70° magnetic latitude is reduced, with radar echoes shifting to lower latitudes. An examination into the frequency-dependence of nightside backscatter evolution during substorms reveals that although most backscatter data is based upon operations in the 08–14 MHz range, higher operating frequencies may offer improved performance in the period just prior to and immediately following expansion phase onset. We suggest that the SuperDARN array of high-frequency coherent-scatter radars, and in particular those radars with the ability to simultaneously operate at dual frequencies, will play a key role in future space- and ground-based studies of substorms.

KW - SuperDARN

KW - substorm DCS-publications-id

KW - art-888

KW - DCS-publications-credits

KW - iono-fa

KW - DCS-publications-personnel-id

KW - 104

U2 - 10.1029/2007JA012910

DO - 10.1029/2007JA012910

M3 - Journal article

VL - 113

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

M1 - A04308

ER -