Biography:

In the past A.M. Du has collaborated on articles with X.D. Zhao. One of their most recent publications is Observations of dawn–dusk aligned polar cap aurora during the substorms of January 21, 2005. Which was published in journal Planetary and Space Science.

More information about A.M. Du research including statistics on their citations can be found on their Copernicus Academic profile page.

A.M. Du's Articles: (4)

Observations of dawn–dusk aligned polar cap aurora during the substorms of January 21, 2005

AbstractA new type of polar cap aurora, dawn–dusk aligned polar cap aurora (DDAPCA), was detected during the exceptionally intense January 21, 2005 substorm (AEmax=3504 nT). The DDAPCA was located at very high latitude (>85° MLAT) in the polar cap region. As the interplanetary magnetic field (IMF) GSM By component rotated from a positive to a negative value, the DDAPCA tilt angle relative to the dawn–dusk direction rotated anticlockwise and reached ∼45°. It is speculated that the DDAPCA arises from the formation of an X-line in the distant (>80RE) tail due to polar cap magnetic field reconnection under unusually high solar wind compression conditions.

Comments on “Interplanetary and geomagnetic parameters during January 16–26, 2005” by R.P. Kane

AbstractWe write this note of clarification to show that Kane (2012) has incorrectly interpreted the interplanetary magnetic field during the event by using low time-resolution data, and has thus misinterpreted the concluding comments of Du et al. (2008). Our recent paper (Du et al., 2011b) has shown that the solar wind energy input during northward IMF events is very low. Thus the interpretation of the Du et al. (2008) article given by the authors stand as was stated.

The magnetic local time distribution of ring current during the geomagnetic storm

AbstractThe magnetic local time distribution of the ring current during 879 geomagnetic storms (identified by SYMH<−30 nT) in the 23rd solar cycle (1996–2006) was investigated by using 23 mid-low latitude ground-based magnetometers. The storms are divided into eight different classes with a step of 20 nT for the statistical analysis. For each class, the dusk side events, for which the H component minimum located in the dusk sector is mostly corresponding to the UT of minimum SYMH index, are about 59.5% of the total events. Whereas the noon side events are about 20.0%, the night side events are about 18.7%, and the dawn side events are about 1.8%. The H component distributions with MLT indicate that the magnetic field disturbance during the magnetic storm events is not only related to the symmetrical ring current, but also to the other current, mainly the partial current. A further statistical study of the dusk side events shows that both the symmetric and partial ring currents enhance accompanied by the increase in the storm class during the main phase. And the partial ring current makes a greater contribution to the main phase of the storm. Referring to the interplanetary parameters, the distinction of the solar wind velocity Vx is more obvious than the interplanetary magnetic field Bz for the dusk side events in different classes. The comparisons between dusk side and other side events in the same class indicate that besides the solar wind velocity Vx, the interplanetary magnetic field By also affects on the disturbance of ring current on the ground in MLT.

Coupling of semiannual and annual variations in the SuperMAG SML and SMU indices

Highlights•The annual/semiannual variation of SML and SMU is typically coupled together.•We quantitatively separate the semiannual and annual variations of geomagnetic index SMU/SML.•We suggested a new index (SMO*) to indicate the semiannual variation of SML.

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