Case studies of the propagation characteristics of auroral TIDS with EISCAT CP2 data using maximum entropy cross-spectral analysis

Y., S.; Schlegel, K.; Xu, Jisheng

doi:10.1007/s005850050589

Cited by 11 publications

(12 citation statements)

References 20 publications

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“…To date there have been very few reports showing the variability of MSTID parameters with altitude at high latitudes. These investigations mainly used ISR and ionosonde techniques, but with limited data and only one study at high latitudes using the EISCAT radar (e.g., Djuth et al, ; Ma et al, ; Nicolls et al, ; Oliver et al, ; Ratovsky et al, ; Tedd et al, ; Vadas, ). In particular Nicolls et al () reported TID height structure from Arecibo Observatory (18°N) obtained on two consecutive days (23–25 July 2009).…”

Section: Altitudinal Variabilitymentioning

confidence: 99%

Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar

et al. 2018

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Near‐continuous electron density measurements obtained over a ∼3 year period, 2010–2013, using the Poker Flat Incoherent Scatter Radar (PFISR) in central Alaska (69°N, 147°W) have been analyzed to quantify the properties of over 650 high‐latitude medium‐scale traveling ionospheric disturbances (MSTIDs). Our analysis focused on the altitude range 100–300 km encompassing the lower ionosphere/thermosphere and yielded first full seasonal day/night distributions of MSTIDs at high northern latitudes with mean values: horizontal wavelength 446 km, horizontal phase speed 187 m/s, and period 41 min. These year‐round measurements fill an important summertime gap in existing MSTID measurements revealing predominantly eastward wave propagation during the summer, while continued winter season observations agree well with previous reports of near southward propagating MSTIDs. Our 3 years of results suggest a cyclic change in the seasonal horizontal propagation directions that was found to be quantitatively consistent with critical level wind and dissipative filtering. Concurrent measurements of the vertical wavelength spectrum as a function of altitude also compared favorably in shape with that calculated using a theoretical dispersion relation (Vadas & Fritts, 2005, https://doi.org/10.1029/2004JD005574) for the thermosphere, but with a higher mean value. Evidence supporting the systematic broadening and shrinking in the azimuthal distributions of the MSTIDs during the course of the year was also found, as well as an unexpected correlation between the MSTID propagation directions and the AE index, both of which are under further investigation.

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Section: Altitudinal Variabilitymentioning

confidence: 99%

Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar

et al. 2018

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“…It is a statistical spectral analysis technique, which permits to enhance the resolution and signal/noise ratio of any measure on a given system. Owing to this priority, multichannel maximum‐entropy method was used by authors to determine TID propagation parameters [ Wan et al , 1998a; Ma et al , 1998]. The adoption of this method on GPS TEC array data was developed by Wan et al [1997].…”

Section: Propagation Of Lstids In North America Europe and Asia: Crmentioning

confidence: 99%

Large‐scale traveling ionospheric disturbances observed by GPS total electron content during the magnetic storm of 29–30 October 2003

et al. 2007

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[1] We have investigated the propagation of large-scale traveling ionospheric disturbances (LSTIDs) during the super magnetic storm of 29-30 October 2003. Twodimensional total electron content (TEC) perturbation maps over North America were built using TEC data provided by the American GPS network and the International GNSS Service. Three LSTID events were observed in the range of 30°N-50°N, 60°W-110°W during this period. The first two LSTIDs occurred consecutively during 0620-0800 UT on 29 October at the local time of midnight, right after the onset of the big substorm; the third one was found at noon during the expansion phase of another substorm on 30 October. The phase fronts of these LSTIDs passed over the United States and traveled southwestward to the distance of $2000 km with the maximum front width of $4000 km and the duration of less than 2 hours. The maximum amplitude of TEC perturbations attained 3 total electron content units (TECUs). The results differ from the former observation of Afraimovich and Voeykov (2004) and Afraimovich et al. (2006), who reported a solitary LSTID propagating southwestward over the United States with the amplitudes of up to 14 TECU on 30 October 2003. We have checked the magnetic H component observed at the geomagnetic observatories in North America and found it is most likely that the auroral westward electrojet was the cause of the LSTIDs on 29 October. The source region for these TIDs was likely to be located several hundred kilometers north of 50°N. Cross-spectral analysis was conducted to obtain the global propagation characteristics of LSTIDs during this superstorm. Equatorward LSTIDs were found in all the three sectors of North America, Europe, and Asia, showing high correlation with the occurrence of auroral substorms.

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“…The major generation mechanism of LSTIDs is thought to be the energy input from the magnetosphere to the auroral ionosphere, such as Joule heating and particle precipitation during auroral substorms [ Crowley and Jones , ; Hajkowicz and Hunsucker , ; Bowman , ; Hajkowicz , , , ; Ma et al ., ; Afraimovich et al ., ; Afraimovich et al ., ; Afraimovich , ; Saito et al ., ; Shiokawa et al ., ; Tsugawa et al ., ; Tsugawa et al ., ; Tsugawa et al ., ; Hawlitschka , ; Ding et al ., ; Ding et al ., ; Ding et al ., ; Ogawa et al ., ; Crowley and Rodrigues , ; Nicolls et al ., ; Perevalova et al ., ]. Other possible excitation mechanisms have also been discussed by some authors.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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This paper presents a statistical result of large‐scale traveling ionospheric disturbances (LSTIDs) associated with moving solar terminator in China during 12 months from February 2011 to January 2012. The LSTIDs are identified by the two‐dimensional total electron content (TEC) perturbation maps, which are built based on the observations of GPS network data from China. The GPS observations are combined with the observations from an ionosonde chain established by the Institute of Geology and Geophysics, Chinese Academy of Sciences. A total of 135 LSTID events are identified at dawn, while there is indiscernible LSTID at dusk. Meanwhile, these LSTIDs are captured by the ionosonde chain which shows that there are perturbations in the virtual heights during the passage of LSTIDs at the height between 200 and 700 km. The occurrence rate of LSTIDs shows a maximum in winter and a minimum in summer. The LSTIDs propagate across China with phase front widths larger than 1500 km. The propagation direction of LSTIDs is northwestward in winter, southwestward in summer, and quasi‐westward in equinoxes, respectively. The average period, horizontal phase velocity, and horizontal wavelength of LSTIDs are 79 ± 12 min, 288 ± 43 m/s, and 1503 ± 205 km, respectively. The relative TEC perturbations of the LSTIDs attenuate as the LSTIDs travel across China.

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Case studies of the propagation characteristics of auroral TIDS with EISCAT CP2 data using maximum entropy cross-spectral analysis

Cited by 11 publications

References 20 publications

Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar

Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar

Large‐scale traveling ionospheric disturbances observed by GPS total electron content during the magnetic storm of 29–30 October 2003

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

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