Numerical Modeling of the Concentric Gravity Wave Seeding of Low‐Latitude Nighttime Medium‐Scale Traveling Ionospheric Disturbances

Chou, Ming-Yi; Lin, Charles; Huba, J. D.; Lien, C. P.; Chen, Chia-Hung; Yue, Jia; Chang, Loren C.; Rajesh, P. K.

doi:10.1029/2018gl077959

Cited by 11 publications

(13 citation statements)

References 50 publications

(76 reference statements)

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“…Its potential ionospheric impact did not reach the CONUS near the flare peak time unless it traveled at more than 800 m/s, which is unlikely. GNSS observations to be discussed show no sign of inland‐ward propagation TIDs at least for the majority portion of CONUS, and no sign of the characteristic concentric wave patterns associated with tropospheric activities (e.g., in Azeem et al, ; Chou et al, ; Nishioka et al, ); rather, the TID waves were eastward or southeastward, and the wave fronts were initially quasi‐parallel to the solar terminator and then rotated clockwise.…”

Section: Observation and Analysis Methodsmentioning

confidence: 98%

“…The fluctuations marked as vertical green solid lines are rapid ionospheric responses to flare bursts, and the dashed lines are postflare oscillations/TIDs induced by the three major X-class events. Chou et al, 2018;Nishioka et al, 2013); rather, the TID waves were eastward or southeastward, and the wave fronts were initially quasi-parallel to the solar terminator and then rotated clockwise.…”

Section: Observation and Analysis Methodsmentioning

confidence: 99%

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Traveling Ionospheric Disturbances and Ionospheric Perturbations Associated With Solar Flares in September 2017

Zhang¹,

Coster²,

Erickson³

et al. 2019

JGR Space Physics

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Solar flares provide strong impulsive radiation and energy injection to the sunlit upper atmosphere. The impact on the ionosphere is immense in spatial scale, and therefore, it is not immediately evident if dramatically elevated neutral heating can lead to excitation of acoustic gravity waves. Using primary observations from Global Navigation Satellite System differential TEC (total electron content) over the continental United States, this paper presents postflare ionospheric observations associated with three X‐class flares on 6, 7, and 10 September 2017. Postflare ionospheric changes had two significant morphological characteristics: (1) A few minutes after the X9.3 flare peak on 6 September, clear traveling ionospheric disturbance (TID) fronts emanated near the sunrise terminator with alignment parallel to its direction—TIDs propagated predominantly eastward into the dayside with a 150 m/s phase speed and a ∼30‐min period; (2) synchronized differential TEC oscillations over continental United States with ∼60‐min periodicity and damping amplitude over time, following all three X‐class flares. Postflare ionospheric oscillation spectra exhibited significantly enhanced amplitudes and changes of periodicities (including the appearance of the 60‐min oscillations). The Millstone Hill incoherent scatter radar observed large ionospheric up‐welling occurring nearly simultaneously as detected TIDs at the X9.3 flare peak, with up to 80 m/s enhancements in vertical drift at 500 km lasting for ∼30 min. Results suggest that significant solar flare heating and associated dynamical effects may be an important factor in TID/acoustic gravity wave excitation.

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Section: Observation and Analysis Methodsmentioning

confidence: 98%

Section: Observation and Analysis Methodsmentioning

confidence: 99%

Traveling Ionospheric Disturbances and Ionospheric Perturbations Associated With Solar Flares in September 2017

Zhang¹,

Coster²,

Erickson³

et al. 2019

JGR Space Physics

View full text Add to dashboard Cite

show abstract

“…The NRL self-consistent SAMI3/ESF model based on the 2-D SAMI2 (Sami2 is Another Model of the Ionosphere) and 3-D SAMI3 (Huba et al 2000;Huba and Joyce, 2010) has applied to study the evolution and generation of ESF (Huba et al 2008(Huba et al , 2009aKrall et al 2013;Wu et al 2015) and nighttime MSTIDs (Duly et al 2014;Chou et al 2018). In this study, the SAMI2 model is run for 43 h to initial the SAMI3/ESF model.…”

Section: The Sami3/esf Modelmentioning

confidence: 99%

Numerical Modeling of the Disappearance of Equatorial Plasma Dubble by the Nighttime Medium-scale Traveling Ionospheric Disturbances

Chou

Lin

Huba

2020

Preprint

Self Cite

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The Naval Research Laboratory first-principles ionosphere model SAMI3/ESF is performed to study the interaction between the nighttime medium-scale traveling ionospheric disturbances (MSTIDs) and equatorial plasma bubbles (EPBs). The synthetic Es layer instability driven by the external dynamo currents are imposed into the potential equation to induce polarization electric fields for generating the MSTIDs. Simulations demonstrate that the MSTIDs alone can inhibit the upward growth of EPBs, but are insufficient to explain the disappearance of EPBs. The meridional winds are necessary to comprehend the underlying mechanism. The zonal and vertical E × B drifts of MSTIDs also affect the morphology of EPBs that could result in a reverse-C shape structure.

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“…Accordingly, it is acceptable that the deviation of excitation time was almost 30 min in this case. The convection cell, especially in the case of the overshooting process at the top of the convective cloud, has been proven to be the initial excitation of CGWs [9,21,66]. According to the excitation position and time, the excitation source of CGWs is a thunderstorm in the region of 40.5°-41.5° N and 108°-109° E. In accordance with the investigation by Wen et al [63], the convection began at 19:00 LT and developed for ~6 h. The CGWs were excited in the initial stage of the thunderstorm, between 19:30 LT and 20:00 LT.…”

Section: Cgws Excitation Sourcementioning

confidence: 99%

A Case Study of the Stratospheric and Mesospheric Concentric Gravity Waves Excited by Thunderstorm in Northern China

et al. 2018

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In this paper, the complete process in which a concentric gravity wave (CGW), excited by a tropospheric thunderstorm, propagated into the stratosphere and mesosphere in Northern China is investigated. A strong thunderstorm developed in the middle of the Inner Mongolia autonomous region on the night of 10th August 2013. The stratospheric temperature perturbation, caused by the CGW, was observed by the Atmospheric Infrared Sounder (AIRS) at 02:11 LT 11th August 2013. An all-sky OH imager at the Shuozhou station (39.8° N, 112.1° E), supported by the Meridian Space Weather Monitoring Project, measured the mesospheric CGW between 22:00 LT to 23:00 LT on the night. It was certified that both the stratospheric and mesospheric CGWs were triggered by the aforementioned thunderstorm, and the excitation source was calculated to be located at (40.59° N, 108.67° E) by employing the dispersion relation. The CGWs were excited in the initial stage of the thunderstorm. The temperature and wind field data obtained by SABER and meteoric radar, respectively, were used to evaluate the background properties of the respective propagation regions. The result shows that an obvious thermal duct structure, with a positive squared vertical wavenumber (m2) existed around the OH layer.

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Numerical Modeling of the Concentric Gravity Wave Seeding of Low‐Latitude Nighttime Medium‐Scale Traveling Ionospheric Disturbances

Cited by 11 publications

References 50 publications

Traveling Ionospheric Disturbances and Ionospheric Perturbations Associated With Solar Flares in September 2017

Traveling Ionospheric Disturbances and Ionospheric Perturbations Associated With Solar Flares in September 2017

Numerical Modeling of the Disappearance of Equatorial Plasma Dubble by the Nighttime Medium-scale Traveling Ionospheric Disturbances

A Case Study of the Stratospheric and Mesospheric Concentric Gravity Waves Excited by Thunderstorm in Northern China

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