Lunar Tidal Modulation of Periodic Meridional Movement of Equatorial Ionization Anomaly Crest During Sudden Stratospheric Warming

Mo, X. H.; Zhang, Donghe

doi:10.1002/2017ja024718

Cited by 20 publications

(36 citation statements)

References 48 publications

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“…Note that quasi 10-day oscillations of northern and southern EIA crests are in-phase, which are consistent with quasi 16-day oscillations in northern and southern EIA crests during 2002-2003 NH SSW, suggesting quasi 10-day oscillations of northern and southern EIA crests are caused by common physical processes, e.g. fountain effect (Mo et al, 2018).…”

Section: Results and Analysissupporting

confidence: 72%

Quasi 10-day wave modulation of equatorial ionization anomaly during the Southern Hemisphere stratospheric warming of 2002

Mo¹

2019

Preprint

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Abstract. The present paper studies the perturbations in equatorial ionization anomaly (EIA) region during the Southern Hemisphere (SH) sudden stratospheric warming (SSW) of 2002, using the location of EIA crests derived from Global Positioning System (GPS) station observations and the Total Electron Content (TEC) obtained by International GNSS Service (IGS) global ionospheric TEC map (GIMs) in Asian sector. A strong quasi 10-day periodic oscillation is clearly identified in EIA region, and it has in-phase relationship between northern and southern EIA crests. An eastward phase progression of quasi 10-day wave is also seen in polar stratospheric temperature during this period, suggesting the enhanced quasi-10-day planetary wave associated with SSW produced oscillation in EIA region through modulating the equatorial fountain effect. Our results reveal some newer features of ionospheric variation that have not been reported during Northern Hemisphere (SH) SSWs.

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Section: Results and Analysissupporting

confidence: 72%

Quasi 10-day wave modulation of equatorial ionization anomaly during the Southern Hemisphere stratospheric warming of 2002

Mo¹

2019

Preprint

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“…It has been demonstrated that the ionosphere could be remarkably disturbed during SSW events, and one of the most distinct responses is the occurrence of a semidiurnal pattern in ionospheric parameters (Anderson & Araujo-Pradere, 2010;Chau et al, 2009;Chau et al, 2012;Fang et al, 2012;Fang et al, 2014;Fejer et al, 2010;Fuller-Rowell et al, 2011;Goncharenko et al, 2012;Goncharenko & Zhang, 2008;He et al, 2017;Maute et al, 2015;Mo & Zhang, 2018;Pedatella et al, 2012;Pedatella & Forbes, 2009;Pedatella & Forbes, 2010;Siddiqui et al, 2017). It is first shown in Goncharenko and Zhang (2008) with the analysis of ion temperature from the Millstone Hill Incoherent Scatter Radar.…”

Section: Introductionmentioning

confidence: 99%

The Comparison of Lunar Tidal Characteristics in the Low‐Latitudinal Ionosphere Between East Asian and American Sectors During Stratospheric Sudden Warming Events: 2009–2018

et al. 2019

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Longitudinal differences of low‐latitudinal ionospheric responses during five major, four minor, and a none‐stratospheric sudden warming (SSW) winters from 2009 to 2018 between East Asian and American sectors are studied with total electron content (TEC). The time‐shifted semidiurnal (TS) pattern and the amplitude (AM2), phase angle (PAM2), and relative strength (RSM2) of the lunar semidiurnal tide (M2) harmonic in TEC are compared between the two sectors. Main results are as follows: (1) TS patterns, AM2,and RSM2 tend to be more discernable or larger in the American sector than in the East Asian sector. (2) TS patterns and PAM2 correspond well with the moon phase, and the occurrence of TS patterns coincides well with the enhancement of AM2 and RSM2. (3) Such patterns sometimes occur before the polar peak warming and experience several cycles during one event, but the most significant one tends to follow the peak warming. These characteristics are most distinct during major events with low solar activities. Our results support the mechanism that TS patterns in low‐latitudinal ionosphere parameters are due to enhanced lunitidal effects on the E region dynamo. Besides, changes in temperature and wind during SSWs can also contribute to the generation of TS signatures. Longitudinal differences in TEC suggest that the M2 influence on the low‐latitudinal ionosphere tends to be more prominent in the American sector than in the East Asian sector during SSWs. These differences probably result from a combined effect of the longitudinal variety in atmospheric (especially tidal) and electrodynamic processes.

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“…In our previous studies, a 14-to-15 d wave during several NH SSW events is ascribed to lunar tide (Mo et al, 2018). So the source of quasi-10 d oscillations in the EIA region during the 2002 SH SSW is different from 14-to-15 d waves during the NH SSW.…”

Section: Discussionmentioning

confidence: 84%

“…1. Since the ionospheric vertical TEC usually reaches the maximum at the EIA crest, the location of the EIA crest can be obtained by vertical TEC values at each ionospheric penetration point (IPP), which is the intersection of the line of sight and the ionospheric shell (assumed to be 400 km) (Mo et al, 2014). The relative accuracy of the TEC is 0.02 total electron content units (1 TECU = 10 16 electrons m −2 ) (Hofmann-Wellenhof et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Quasi-10 d wave modulation of an equatorial ionization anomaly during the Southern Hemisphere stratospheric warming of 2002

Zhang

2020

Ann. Geophys.

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Abstract. The present paper studies the perturbations in an equatorial ionization anomaly (EIA) region during the Southern Hemisphere (SH) sudden stratospheric warming (SSW) of 2002, using the location of EIA crests derived from global positioning system (GPS) station observations, the total electron content (TEC) obtained by the International GNSS (global navigation satellite system) Service (IGS) global ionospheric TEC map (GIMs) and the equatorial electrojet (EEJ) estimated by the geomagnetic field in the Asian sector. The results indicate the existence of an obvious quasi-10 d periodic oscillation in the location and TEC of the northern and southern EIA crest. An eastward phase progression of the quasi-10 d wave producing the SH SSW of 2002 is also identified in polar stratospheric temperature. Previous studies have shown that a strong quasi-10 d planetary wave with zonal wave numbers s=1 extended from the lower stratosphere to the mesosphere and lower thermosphere during the SH SSW of 2002 (Palo et al., 2005). Moreover, the EEJ driven by the equatorial zonal electric field exhibits quasi-10 d oscillation, suggesting the enhanced quasi-10 d planetary wave associated with SSW penetrates into the ionosphere E region and produces oscillation in the EIA region through modulating the E-region electric fields. Our results reveal some newer features of ionospheric variation that have not been reported during Northern Hemisphere (NH) SSWs.

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Lunar Tidal Modulation of Periodic Meridional Movement of Equatorial Ionization Anomaly Crest During Sudden Stratospheric Warming

Cited by 20 publications

References 48 publications

Quasi 10-day wave modulation of equatorial ionization anomaly during the Southern Hemisphere stratospheric warming of 2002

Quasi 10-day wave modulation of equatorial ionization anomaly during the Southern Hemisphere stratospheric warming of 2002

The Comparison of Lunar Tidal Characteristics in the Low‐Latitudinal Ionosphere Between East Asian and American Sectors During Stratospheric Sudden Warming Events: 2009–2018

Quasi-10 d wave modulation of an equatorial ionization anomaly during the Southern Hemisphere stratospheric warming of 2002

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