Global propagation features of large-scale traveling ionospheric disturbances during the magnetic storm of 7~10 November 2004

Abstract

Abstract. Larger-scale traveling ionospheric disturbances (LSTIDs) were studied using the total electron content (TEC) data observed from global GPS network in the regions of North America, Europe, and East Asia during the magnetic storm of 7∼10 November 2004. 4 LSTID events were detected in North America, 4 in Europe, and 3 in East Asia. The parameters of the 11 LSTID events, such as the propagation azimuth (the angle with respect to north, taking clockwise as positive), horizontal phase velocity and damping rate were determined. Our results showed two new propagation features of the LSTIDs. One was the latitudinal dependence of the LSTIDs' propagation azimuths. The LSTIDs tended to deflect more to west from south as they propagated to lower latitudes, which indicated that the Coriolis force was one of the main causes of the LSTIDs' southwestward deviation. The other was the different mean horizontal phase velocities of LSTIDs among different regions. The mean horizontal phase velocity of LSTIDs was 422 ± 36 m s −1 in North America, 381 ± 69 m s −1 in Europe, and 527 ± 21 m s −1 in East Asia, respectively. The results also indicated that the amplitudes of LSTIDs decreased during their propagation for every event, and the daytime damping rates were more than 1 time larger than the nighttime ones due to different ion drag between daytime and nighttime. The source regions of the LSTIDs were likely to be located between geomagnetic latitudes of 68 • N and 62 • N in North America, and between 65 • N and 57 • N in Europe, according to the variation of magnetic H component observed in these two regions.

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

“…LSTIDs originating from auroral sources usually propagate southwestward in high-latitude regions (Ding et al, 2007(Ding et al, , 2008, and westward deviations from the south seem to be caused by the westward movement of the source region (Hocke and Schlegel, 1996). Song et al (2012) found that westward deviations from south of LSTIDs increased as the LSTIDs propagated from high to middle latitudes due to the Coriolis force. At middle and low latitudes, the Japanese GEONET observation network has found eastwardpropagating in addition to westward-propagating traveling ionospheric disturbances (TIDs) .…”

Statistical study of large‐scale traveling ionospheric disturbances generated by the solar terminator over China

“…B r s is the main error source of the ionospheric TEC deriving from GPS observation and could reach up to several units of TEC (TECU, 1 TECU = 10 16 electrons m −2 ) or even larger than the real STEC [ Sardón and Zarraoa , ; Zhang et al ., ]; thus, the effect of this biases must be removed to get the real STEC. Here, we corrected this biases by adjusting the data with those of Global Ionospheric Maps from the Crustal Dynamics Data Information System [ Noll , ], which are interpolated in both space and time [ Ding et al ., ; Song et al ., ].…”

Study of ionospheric disturbances over the China mid- and low-latitude region with GPS observations

“…To be exact, this disturbances propagate southwestward. Many previous studies showed that the propagation of TIDs was not always toward the Equator (Tsugawa et al, 2004;Song et al, 2012). In this paper, we note that the direc- …”