Characteristics of medium‐scale traveling ionospheric disturbances observed near the Antarctic Peninsula by HF radar

Grocott, Adrian; Hosokawa, K.; Ishida, Tamao; Lester, M.; Milan, S. E.; Freeman, M. P.; Sato, Natsuo; Yukimatu, A. S.

doi:10.1002/jgra.50515

Cited by 49 publications

(72 citation statements)

References 48 publications

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“…Recently, MSTIDs have been studied statistically in many places worldwide using various techniques (Frissell et al 2014(Frissell et al , 2016Fukushima et al 2012;Grocott et al 2013;He et al 2004;Ichihara et al 2013;Ishida et al 2008;Klausner et al 2009;Kotake and Otsuka 2007;Medvedev et al 2013;Oinats et al 2015Oinats et al , 2016Otsuka et al 2011Otsuka et al , 2013Shiokawa et al 2003Shiokawa et al , 2009. In this study, we present observations of MSTIDs' horizontal velocities over Taiwan using HF Doppler sounding.…”

Section: Introductionmentioning

confidence: 87%

Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding

Fišer

Chum

Liu

2017

Earth Planets Space

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We analyzed horizontal velocities of medium-scale traveling ionospheric disturbances using HF Doppler sounding over Taiwan from January 2014 to January 2016. Meridional components of the observed horizontal velocities are in most cases larger than zonal components. In summer, poleward propagation prevails, whereas in winter, disturbances primarily propagate southward. Zonal components of the analyzed events are mostly eastward. Seasonal behaviors of the observed propagation directions are similar at other locations with HF Doppler sounding at middle and low latitudes. Horizontal velocities of the observed events are in the 50-400-ms −1 range. The upper limit is determined using the spacing between reflection points, making the uncertainty in velocity very large for events with velocities larger than this limit. The mean horizontal velocity is 210 ms .

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Section: Introductionmentioning

confidence: 87%

Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding

Fišer

Chum

Liu

2017

Earth Planets Space

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“…Ishida et al [2008] and Grocott et al [2013] both suggest that midlatitude MSTIDs, such as those observed by BKS, could also be generated in the auroral zone through geomagnetic forcing processes. To search for a possible geomagnetic source, we examined data from a longitudinal chain of magnetometers distributed along the eastern coast of North America through Greenland, as well as a chain in Alaska.…”

Section: Possible Mstid Sourcesmentioning

confidence: 97%

“…Ishida et al [2008] conducted a statistical study using SuperDARN radars in Japan and Alaska which suggested that MSTID propagation from high latitude to midlatitudes is possible. Grocott et al [2013] conducted a more extensive study using the midlatitude, Southern Hemisphere Falkland Islands Radar. They found a correlation (albeit weak) between geomagnetic activity and MSTID occurrence, as well as a preferential equatorward direction of propagation for the majority of MSTIDs observed.…”

Section: 1002/2014ja019870mentioning

confidence: 99%

“…In particular, the analysis techniques described here allow for the determination of MSTID parameters such as propagation azimuth, horizontal velocity, horizontal wavelength, and period. Many previous studies have suggested auroral/geomagnetic sources to be the cause of MSTIDs at both high latitudes [Samson et al, 1990;Bristow et al, 1994] and midlatitudes [Grocott et al, 2013]. We have chosen the GBR and BKS radars because they cover similar longitudinal sectors, making it more likely that both radars could see MSTIDs generated by a single auroral source.…”

Section: Superdarnmentioning

confidence: 99%

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Climatology of medium‐scale traveling ionospheric disturbances observed by the midlatitude Blackstone SuperDARN radar

et al. 2014

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Horizontal velocities ranged from 50 to 250 m s −1 with a distribution maximum between 100 and 150 m s −1 . Horizontal wavelengths ranged from 100 to 500 km with a distribution peak at 250 km, and periods between 23 and 60 min, suggesting that the MSTIDs may be consistent with thermospheric gravity waves. A local time (LT) dependence was observed such that the dominant (southeastward) population decreased in number as the day progressed until a late afternoon increase. The secondary (northwestward) population appeared only in the afternoon, possibly indicative of neutral wind effects or variability of sources. LT dependence was not observed in other parameters. Possible solar-geomagnetic and tropospheric MSTID sources were considered. The auroral electrojet (AE) index showed a correlation with MSTID statistics. Reverse ray tracing with the HINDGRATS model indicates that the dominant population has source regions over the Great Lakes and near the geomagnetic cusp, while the secondary population source region is 100 km above the Atlantic Ocean east of the Carolinas. This suggests that the dominant population may come from a region favorable to either tropospheric or geomagnetic sources, while the secondary population originates from a region favorable to secondary waves generated via lower atmospheric convection.

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“…A number of papers presenting statistical studies of TIDs have been published in the last 15 years (Afraimovich et al 1999(Afraimovich et al , 2000Ding et al 2008;Kotake et al 2007;Medvedev et al 2013;Otsuka et al 2011;Shiokawa et al 2003;Tsugawa et al 2004). There are also statistical studies that utilized SuperDARN radar data (Bristow et al 1996;He et al 2004;Ichihara et al 2013;Ishida et al 2008;Grocott et al 2013). Apparently, a relatively small number of such studies are related to the complexity of extensive dataset processing, as well as the issues concerning an automated interpretation of HF radar data.…”

Section: Introductionmentioning

confidence: 99%

Statistical study of medium-scale traveling ionospheric disturbances using SuperDARN Hokkaido ground backscatter data for 2011

Oinats

Kurkin

Нишитани

2015

Earth Planets Space

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We describe an automated technique to determine parameters of traveling ionospheric disturbances (TIDs) using the Super Dual Auroral Radar Network (SuperDARN) high frequency (HF) radar data. The technique is based on the analysis of minimum ground backscatter range variations corresponding to different radar beams. Using this technique, we processed the SuperDARN Hokkaido radar data for 2011 and revealed statistical distributions of medium-scale TID (MSTID) azimuth and apparent horizontal velocity. We found four peaks with a distinct diurnal and seasonal dependence in the MSTID azimuth occurrence rate distributions. Northeast MSTID azimuths (20°to 50°) are typical of the summer and equinox morning hours; southeast azimuths (100°to 140°) prevail in the winter daytime; southwest azimuths (190°to 220°) are typical mostly in the summer and equinox nighttime and in the equinox evening; northwest azimuths (280°to 320°) are typical of the summer daytime and evening. The apparent horizontal velocities are generally within the 100 to 160 m/s range. The obtained results agree well with earlier studies by other researchers. However, there are also certain differences. The summer daytime northwestward MSTIDs are not indicated in the earlier studies. The nighttime horizontal velocities are 1.5 to 2 times higher than those in the daytime. Furthermore, winter velocity values are about 1.5 times higher than those in other seasons. These differences might be associated with the peculiarities of the data recorded by different facilities, or the features of the processing techniques, and require further investigation for their interpretation.

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Characteristics of medium‐scale traveling ionospheric disturbances observed near the Antarctic Peninsula by HF radar

Cited by 49 publications

References 48 publications

Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding

Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding

Climatology of medium‐scale traveling ionospheric disturbances observed by the midlatitude Blackstone SuperDARN radar

Statistical study of medium-scale traveling ionospheric disturbances using SuperDARN Hokkaido ground backscatter data for 2011

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