Plasma density undulations correlated with thermospheric neutral mass density in the daytime low‐latitude to midlatitude topside ionosphere

Park, Jaeheung; Lühr, H.; Nishioka, Michi; Kwak, Young‐Sil

doi:10.1002/2015ja021525

Cited by 4 publications

(5 citation statements)

References 46 publications

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“…Our present observations showed comparable results with the previous observations. The low occurrences during the equinoxes and summer are also similar to the results of Park et al (), Forbes et al (), and Liu et al ().…”

Section: Discussionsupporting

confidence: 90%

“…Kotake et al (), Ding et al (), and Otsuka et al (, ) have reported that in the NH middle latitudes, the highest occurrence of daytime MSTIDs was during the winter (between November and February). Park et al () observed MSTIDs in a region between 300 and 400 km altitude, using the density measurements of the Challenging Minisatellite Payload (CHAMP) satellite. They observed the highest occurrence of MSTIDs over South America during the winter (June).…”

Section: Discussionmentioning

confidence: 99%

“…The phenomenon began to be modeled numerically in the 1950s (Hines, ). Since then, the TIDs have been studied through a variety of equipment such as ionosondes (Amorim et al, ; MacDougall et al, ; Munro, ), satellites beacon (Forbes et al, ; Garcia et al, ; Park et al, ), airglow imagers (Paulino et al, ; Pimenta et al, ), and the Global Navigation Satellite Systems (GNSS) (Otsuka et al, ; Saito et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Medium‐Scale Traveling Ionospheric Disturbances Observed by Detrended Total Electron Content Maps Over Brazil

et al. 2018

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A ground‐based network of Global Navigation Satellite Systems receivers has been used to monitor medium‐scale traveling ionospheric disturbances (MSTIDs). MSTIDs were studied using total electron content perturbation maps and keograms over south‐southeast of Brazil during the period from December 2012 to February 2016. In total, 826 MSTIDs were observed mainly in daytime, thus presenting median values of horizontal wavelength, period, and horizontal phase velocity of 452 ± 107 km, 24 ± 4 min. and 323 ± 81 m/s, respectively. The direction of propagation varies on the season: during the winter (June–August), the waves preferentially propagated to north‐northeast, while in the other seasons the waves propagated to other directions. The anisotropy observed in the MSTID propagation direction could be associated with the region of the gravity wave generation that takes place in the troposphere. We also found that the MSTIDs were observed most frequently during the daytime, between 11 and 15 local time in winter and near to dusk solar terminator (17–19 local time) in the other seasons. Furthermore, the occurrence of MSTIDs was higher in winter. We suggest that atmospheric gravity waves in the thermosphere, mesosphere, and troposphere could play an important role in generating the MSTIDs and the propagation direction may depend on location of the wave sources.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Medium‐Scale Traveling Ionospheric Disturbances Observed by Detrended Total Electron Content Maps Over Brazil

et al. 2018

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“…Largest perturbations are observed during June solstice months, an interval well overlapping with our study period. Park et al [2014Park et al [ , 2015 have shown the existence of thermospheric GW with horizontal wavelength of 150-600 km both on day and nightside. These GWs are believed to be driven from below because of their close spatial relation to GW activity centers in the stratosphere [e.g., Jiang et al, 2003].…”

Section: The Variability Of Current Densitymentioning

confidence: 99%

Zonal currents in the F region deduced from Swarm constellation measurements

et al. 2016

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The Swarm constellation has been used to estimate zonal currents in the topside F region ionosphere at about 500 km. Near‐simultaneous magnetic field measurements from two altitudes but the same meridian are used for the current density calculations. We consider the period 15 February to 23 June 2014 for deriving a full 24 h local time coverage of the latitudinal distribution over ±50° in magnetic latitude. Intervals with close orbital phasing at the two heights are considered, which repeat every 6 days. From such days seven successive orbits are used where the epochs of equator crossings differ by less than 2 min. Deduced current densities are predominantly eastward (about 20 nA/m2) on the dayside and westward (about 10 nA/m2) on the nightside. A number of different drivers contribute to the observed total current. We identified the gravity‐driven eastward current as the most prominent at low latitudes. Eastward currents in the Northern Hemisphere are clearly stronger than in the south. This is attributed to the proximity of our study period to June solstice, when the solar radiation is stronger in the north. In addition, interhemispheric winds from the Northern (summer) to the Southern (winter) Hemisphere contribute. They cause eastward currents in the north and westward in the south. We find a relatively large variability of the zonal currents both in space and time. The standard deviation is at least twice as large as the mean value of current density. This large variability is suggested to be related to gravity wave forcing from below.

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“…The in situ neutral mass density measurement of Challenging Minisatellite Payload (CHAMP) satellite showed high thermospheric gravity wave activity at the height of 300–400 km during daytime in winter solstice, which generally decrease from high latitudes to low latitudes (Park et al., 2014). Further, neutral mass density and plasma density measurements onboard CHAMP satellite showed a signiﬁcant amount of daytime fluctuations in plasma density was strongly correlated with fluctuations of neutral mass density, particularly in the winter hemisphere, providing direct observation evidence to the cause and effect relationship between thermospheric gravity waves and ionospheric disturbances (Park et al., 2015). The high occurrence rate of periodic ionospheric disturbances at middle latitude in winter presented by this study is consistent with the high AGW activities at stratosphere/mesosphere/thermosphere at similar or higher latitudes of East Asia.…”

Section: Discussionmentioning

confidence: 94%

Latitudinal Variations of Daytime Periodic Ionospheric Disturbances From Beidou GEO TEC Observations Over China

Lei

Dou

et al. 2021

JGR Space Physics

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Using total electron content (TEC) data from a chain of Beidou geostationary satellite TEC receivers along ∼110°E during 2016-2019, the local time, seasonal, and latitudinal occurrence characteristics of periodic TEC perturbation associated with medium scale traveling ionospheric disturbances (MSTIDs) are investigated. The results show that the daytime periodic ionospheric disturbances appear prominently in winter with dominant periods ∼30-40 min. An interesting feature is that the latitudinal variations of periodic ionospheric disturbances show two occurrence peaks at higher and lower latitudes, with a minimum centering around 30°N-33°N, where almost no periodic ionospheric disturbance was detected under the threshold of absolute TEC perturbation greater than 0.3 TECU. Further, using two short-baseline GNSS receiver arrays at middle and low latitudes, the propagation characteristics of the periodic ionospheric disturbances were derived. The median values of propagation azimuth, phase velocity, and period of the ionospheric disturbances at middle (low) latitude are 153.1° (157.4°), 36.7 min (33 min), and 97.2 m/s (62.5 m/s), respectively, showing typical characteristics of MSTIDs. We surmise that the perturbation source and background electron density could play important roles in causing the latitudinal variation of daytime periodic ionospheric disturbances along 110°E. HU ET AL.

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Plasma density undulations correlated with thermospheric neutral mass density in the daytime low‐latitude to midlatitude topside ionosphere

Cited by 4 publications

References 46 publications

Medium‐Scale Traveling Ionospheric Disturbances Observed by Detrended Total Electron Content Maps Over Brazil

Medium‐Scale Traveling Ionospheric Disturbances Observed by Detrended Total Electron Content Maps Over Brazil

Zonal currents in the F region deduced from Swarm constellation measurements

Latitudinal Variations of Daytime Periodic Ionospheric Disturbances From Beidou GEO TEC Observations Over China

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