Signature of the quasi-27-day oscillation in the MLT and its relation with solar irradiance and convection

Guharay, A.; Batista, P. P.; Buriti, R. A.; Schuch, Nelson Jorge

doi:10.1016/j.jastp.2017.06.001

Cited by 8 publications

(12 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most of the profiles show clear upward phase propagation direction although some of them are too irregular. It should be noted that the initial phase values for all the altitude bins are shown in the plot (unlike the maximum phase values which would be downward directed) implying upward wave propagation (Guharay et al 2017). Figure 9 plots the monthly mean vertical phase profiles in the meridional wind.…”

Section: Resultsmentioning

confidence: 99%

On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations

Guharay

Batista

Buriti

et al. 2018

Earth Planets Space

View full text Add to dashboard Cite

The characteristic features of the quarterdiurnal tide (QDT) in the mesosphere and lower thermosphere (MLT) are investigated using meteor radar observations from three low-latitude southern hemispheric stations, Sao Joao do Cariri (7.4°S, 36.5°W), Cachoeira Paulista (22.7°S, 45°W) and Santa Maria (29.7°S, 53.7°W) in 2005. The QDT shows consistent appearance with a weak enhancement during late summer and fall interval. The QDT amplitudes are found to be much smaller (< 3 m/s) than the longer period tidal components most of the times of the year consistent with the previous investigations carried out from various locations over the globe. The vertical wavelength is found to reach up to 80 km in the MLT maximizing in winter although most of the times it remains within 20 km. Therefore, based on the observed characteristics of the QDT, it is surmised that both the migrating and nonmigrating components are involved in manifestation of the QDT at present locations. Further detailed investigations are sought in connection with the important issues pertained to the actual excitation mechanisms and existing dominant QDT modes in the low-latitude MLT.

show abstract

Section: Resultsmentioning

confidence: 99%

On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations

Guharay

Batista

Buriti

et al. 2018

Earth Planets Space

View full text Add to dashboard Cite

show abstract

“…The 27-day period of solar rotation is well known, which often brings about a quasi 27-day periodicity in the ionospheric variation since solar radiation is a major source of ionization (Coley & Heelis, 2012;Ma et al, 2012). Some studies implied that the 20-to 40-day ISOs in the tropical MLT seems to have some connection with the solar rotational period; however, this association may be due to convection and wave activities in the lower atmosphere modulated by solar radiation or radiation absorption of ozone in the stratosphere rather than the solar forcing in situ in the MLT (Guharay et al, 2017;Huang et al, 2015;Kumar et al, 2007;Luo et al, 2001;Takahashi et al, 2010). We attempt to examine the correlation between the quasi 30-day oscillation and the solar activity.…”

Section: Effect Of Solar Rotationmentioning

confidence: 99%

“…Since then, ISOs with periods of about 20-100 days remained to be a topic of interest owing to their complex dynamical process and a wide range of physical involvement. Numerous observational and modeling studies were carried out on plausible mechanisms and propagation features of ISOs in different atmospheric regions (Madden & Julian, 1972;Krishnamurti & Bhalme, 1976;Lau & Lau, 1986;Madden, 1986;Ghil & Mo, 1991;Eckermann et al, 1997;Lieberman, 1998;Mayr et al, 2003;Miyoshi & Fujiwara, 2006;Kumar et al, 2007;Deshpande et al, 2011;Guharay et al, 2011Guharay et al, , 2017Li et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Signature of a Quasi 30‐Day Oscillation at Midlatitude Based on Wind Observations From MST Radar and Meteor Radar

Huang

Wang

et al. 2019

JGR Atmospheres

View full text Add to dashboard Cite

Lots of works make contributions to revealing propagation features and excitation mechanisms of intraseasonal oscillations (ISOs) in the tropics; however, there are few reports on ISOs at higher latitudes. By using measurements of mesosphere‐stratosphere‐troposphere radar at Xianghe (39.8°N, 116.5°E) and meteor radar at Beijing (40.3°N, 116.2°E) and reanalysis data for 105 days from 16 November 2013 to 28 February 2014, we study an ISO with about 30‐day period at midlatitude and high latitude. Radar observations indicate that in the troposphere, the oscillation attains an amplitude peak in zonal wind at about 9 km and propagates downward below 9 km. At about 9–16 km, the oscillation gradually decays with height and then strengthens again as it propagates upward in the stratosphere. In the mesosphere, the oscillation obviously appears at 78–86 km with a maximum amplitude at 80 km. Reanalysis data show that in the troposphere, the oscillation propagates southward. At about 100 (~16 km)‐ to 10 (~32 km)‐hPa levels, the oscillation is gradually reflected back to propagate northward, and then propagates poleward at higher altitude. Refractive index can explain its complex propagation characteristics very well. Consistence and coherence of its phase progression indicate that in the lower atmosphere, the oscillation comes from the polar region. Hence, ISOs can not only originate from but also propagate in the atmosphere at mid and high latitudes.

show abstract

“…Since Sun is the major source of energy of the Earth, it has potential to control and modify various physical, chemical and dynamical processes occurring at various levels in the Earth atmosphere. The prominent signature of the variability of the solar UV irradiance can be observed in the atmosphere with periodicities, 11 years (solar cycle), 1 year (seasonal) and 27 days (Carrington rotation) as investigated by the past investigators from various locations over the globe (Suh and Lim 2006;Guharay et al 2009Guharay et al , 2017, 2019 and references therein). A major portion of the solar UV flux is absorbed in the middle atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…The evident feature of the solar 27-day oscillation was found in various atmospheric parameters, e.g. lightning activity (Füllekrug and Fraser-Smith 1996), ozone concentration (Hood, 1997;Ross and Walterscheid 1991), temperature (Hood 2016), wind (Huang et al 2015;Guharay et al 2017), ionospheric plasma (Pancheva et al 1991;Ma et al 2012;Ren et al 2018), etc. The 27-day oscillation is most pronounced in the Lyman-α line (UV band) although it is present in the total solar irradiance.…”

Section: Introductionmentioning

confidence: 99%

Signature of the 27-day oscillation in the MLT tides and its relation with solar radiation at low latitudes

Guharay

Batista

Buriti

et al. 2020

Earth Planets Space

View full text Add to dashboard Cite

The modulation of the dominant atmospheric tides (i.e. diurnal, semidiurnal and terdiurnal) in the mesosphere and lower thermosphere (MLT) is investigated using long-term meteor wind database from three Southern hemispheric low-latitude locations, São João do Cariri (7.4° S, 36.5° W), Cachoeira Paulista (22.7° S, 45° W) and Santa Maria (29.7° S, 53.7° W). The spectral analysis reveals an evident and intermittent signature of a 27-day oscillation in the tidal amplitudes. Relationship between the 27-day tidal modulation in the MLT and solar rotation is looked into utilizing solar UV flux (Lyman-α) that indicates a conspicuous linkage of the tides with the solar short-term variability. The strong correlation between the solar variability and tidal modulation in the concerned period with positive lags at certain intervals may indicate predominate solar influence on the MLT tides. Potential involvement of the lower, middle and upper atmospheric dynamics and chemistry to support the observed oscillation feature is deemed plausible.

show abstract

Signature of the quasi-27-day oscillation in the MLT and its relation with solar irradiance and convection

Cited by 8 publications

References 20 publications

On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations

On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations

Signature of a Quasi 30‐Day Oscillation at Midlatitude Based on Wind Observations From MST Radar and Meteor Radar

Signature of the 27-day oscillation in the MLT tides and its relation with solar radiation at low latitudes

Contact Info

Product

Resources

About