seasonal variation

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seasonal variation

[′sēz·ən·əl ‚ver·ē′ā·shən]
(geophysics)
The variation of any parameter of the upper atmosphere with season; for example, the variation of ion densities of different parts of the ionosphere, and the resulting variation in transmission of radio signals over large distances.
References in periodicals archive ?
Judging from the seasonality of NR production and consumption, NR prices should be strengthening in January because of seasonally low stocks and increased buying interest due to supply shortages anticipated in forthcoming months from the onset of the wintering season.
The Seasonality ration points out a disproportionate proportion of tourist arrivals and overnights in the best performing month, August, and the annual average, showing high concentration of tourist activities in one month of year.
The residual seasonality is driven by residual seasonality in two components of GDP: private investment and government consumption and investment.
In the second phase, BEA conducted a component-by-component review, the results of which are reported in this paper, to identify the causes of residual seasonality in the GDP and GDI estimates.
While we do not know the exact details of how that mixture will be produced, one can use the published GDP and GDI data to construct a 50/50 mixture and investigate it for any residual seasonality.
Cumulative data over the 2-year surveillance period revealed differences in seasonality by latitude; influenza positivity peaked during December-February in Srinagar (34.
With the objective of assessing seasonality and its contributing factors in patients with BD, we did a cross-sectional study involving 49 euthymic patients with BD diagnosed according to International Statistical Classification of Diseases and Related Health Problems (ICD)-10 criteria.
As part of the ECI direct seasonal adjustment methodology, three quality control statistics produced by the X-12-ARIMA program are used to evaluate seasonality in an ECI series: the F statistic for stable seasonality (Fs), the M7 statistic, and the Qstatistic.
Some sectors are unaffected by seasonality, such as petrochemicals, the market's largest sector.
To make the adjustment, appraisers must be aware of the seasonality in price patterns in their markets and the magnitude of these fluctuations.
They evaluated a relatively simple to model to assess the simultaneous effects of rainfall and temperature on mosquito population dynamics, malaria invasion, persistence and extinction, and the impact of seasonality on transmission.
Educational reforms to improve school enrolment and lessen the burden of education on poor will not succeed unless seasonality is recognised.