Volume 36 Issue 6
Nov.  2016
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QIU Qi, YANG Huigen, LU Quanming, HU Zejun. Motion of Dayside Auroral Arc Observed At Yellow River Station Affected by the Earth's Rotation[J]. Chinese Journal of Space Science, 2016, 36(6): 909-915. doi: 10.11728/cjss2016.06.909
Citation: QIU Qi, YANG Huigen, LU Quanming, HU Zejun. Motion of Dayside Auroral Arc Observed At Yellow River Station Affected by the Earth's Rotation[J]. Chinese Journal of Space Science, 2016, 36(6): 909-915. doi: 10.11728/cjss2016.06.909

Motion of Dayside Auroral Arc Observed At Yellow River Station Affected by the Earth's Rotation

doi: 10.11728/cjss2016.06.909 cstr: 32142.14.cjss2016.06.909
  • Received Date: 2015-10-12
  • Rev Recd Date: 2016-03-02
  • Publish Date: 2016-11-15
  • By using of the all-sky auroral data detected at Chinese Arctic Yellow River Station, the frame of dayside auroral arc is extracted and mapped to the Magnetic Local Time (MLT)-geomagnetic Latitude (MLAT) coordinate system, and the auroral arc velocity induced by the Earth's rotation is calculated. For any auroral arc, its tilt is the angle between the arc direction and the local geomagnetic east-west direction. The results indicate that the velocity is determined by the distance that the arc departs away from zenith and the arc tilt. The arc tilt determines the velocity orientation, and hence is more important. In order to calculate the arc tilt, over 40000 images of dayside auroral arcs are extracted from 4 years observations of Chinese Arctic Yellow River Station. The calculation results show that arc tilt decreases as MLT increases and reverses at about 10:00MLT. Due to the reversal of arc tilt, the arc motion induced by the Earth's rotation is poleward and equatorward motion at dawn and afternoon respectively. The equatorward motion of the arc is much more obvious than that of poleward motion, and its maximum velocity may exceed 300m·-1.

     

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