Atypical nighttime spread‐<i>F</i> structure observed near the southern crest of the ionospheric equatorial ionization anomaly

Fagundes, P. R.; Bittencourt, J. A.; Abreu, A. J. de; Moor, Lilian; Muella, M. T. A. H.; Sahai, Y.; Abalde, J. R.; Pezzopane, Michael; Sobral, J. H. A.; Abdu, M. A.; Pimenta, A. A.; Amorim, D. C. M.

doi:10.1029/2011ja017118

Cited by 5 publications

(1 citation statement)

References 63 publications

(66 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tsunoda [2008] and Narayanan et al [2012] suggested that ST can be usually regarded as a proxy for largescale wave-like irregularity structures, which should be associated with the large-scale MSTIDs in our case. More studies on ST can be found from previous publications [e.g., Tsunoda, 2008;Fagundes et al, 2012;Narayanan et al, 2012;Lynn et al, 2013]. Mixed spread F (MSF) traces (simultaneous range and frequency spreading) [Candido et al, 2011] appeared between 23:00 and 00:45 LT when the depleted front "3" gradually passed over the digisonde.…”

Section: 1002/2014ja020944mentioning

confidence: 99%

Mesoscale field‐aligned irregularity structures (FAIs) of airglow associated with medium‐scale traveling ionospheric disturbances (MSTIDs)

Sun

Wang

et al. 2015

JGR Space Physics

View full text Add to dashboard Cite

In this paper, we report the evolution (generation, amplification, and dissipation) of optically observed mesoscale field-aligned irregularity structures (FAIs) (~150 km) associated with a medium-scale traveling ionospheric disturbance (MSTID) event. There have not been observations of mesoscale FAIs of airglow before. The mesoscale FAIs were generated in an airglow-depleted front of southwestward propagating MSTIDs that were simultaneously observed by an all-sky imager, a GPS monitor, and a digisonde around Xinglong (40.4°N, 30.5°magnetic latitude), China, on 17/18 February 2012. A normalized cross-correlation method has been used to obtain the velocities of mesoscale FAIs and MSTIDs. The mesoscale FAIs had an obvious northwestward relative velocity to main-body MSTIDs (about 87.0 m/s on average). The direction of this relative velocity was roughly parallel to the depleted fronts. Furthermore, the evolution of the mesoscale FAIs was mostly controlled by the intensity of the depleted fronts. Occurred in a highly elevated ionosphere that had a total electron content depletion associated with large negative airglow perturbations (À25%), the mesoscale FAIs grew rapidly when they experienced southeastward wind, which had a speed of about 100 m/s and were measured by a Fabry-Perot interferometer. A northeastward polarization electric field within a depleted airglow front can play a controlling role in the development of the mesoscale FAIs. The electric field can significantly elevate the ionosphere and move the mesoscale FAIs northwestward by the E × B drift. The processes for the generation and development of the polarization electric field and the mesoscale FAIs, however, need further study. Hemisphere, a northwestward (NW) preferable propagation of nighttime MSTIDs was found [Candido et al., 2008;Pimenta et al., 2008;Amorim et al., 2011]. In the statistical analyses cited above, Kubota et al. [2011] recently showed that the SW propagating MSTIDs in Alaska are atmospheric gravity waves (AGWs), whereas SUN ET AL.FAIS OF AIRGLOW ASSOCIATED WITH MSTIDS 9839 PUBLICATIONS Key Points:• An evolution of medium-scale traveling ionospheric disturbances (MSTIDs) is presented • Mesoscale field-aligned irregularity structures (FAIs) (~150 km) of airglow are firstly presented • We first find the mesoscale FAIs had a northwestward relative velocity to main-body MSTIDs (2015), Mesoscale field-aligned irregularity structures (FAIs) of airglow associated with medium-scale traveling ionospheric disturbances (MSTIDs), J. Geophys.

show abstract