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 ?
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.
A global seasonality score (GSS) with total scores ranging from 0 to 24 was derived from the Seasonal Pattern Assessment Questionnaire, after the patients graded the effect that changes of seasons had on them in six areas: sleep length, social activity, mood, weight, appetite and energy level.
The series was discontinued from publication with the March 2010 ECI release, as seasonality was not found in three consecutive revisions.
s] and quality control statistics shown in table 1 confirm the strong seasonality of most of the consumer expenditure series.
0 of the implicit seasonal factor is calculated for each of the 12 calendar months in a given year, and the results are summed to create the total seasonality measure.
These statements are based on management's current expectations, estimates and projections about Provide Commerce and its industry and include, but are not limited to, Provide Commerce's ability to fulfill customer promises and expectations regarding its Valentine's Day product offerings on the Secret Spoon website and the overall seasonality of its business.
Summary: Forex seasonality in the Swiss Franc shows that the USDCHF currency pair has fallen an average of over 200 pips in the past 9 months of September.
However, we expect the second quarter of fiscal 2006, historically the Company's weakest, to be challenging due to normal seasonality and the unpredictability of the buying patterns of certain customers as they may seek to reduce inventory levels as they approach the end of their fiscal year.
Ergo currently believes that principally as a result of the seasonality of the business of Nexus Media, the 2004 annual results of Nexus Media reported in the 8-K/A filed on June 17, 2005 are not materially misstated.
Summary: The Canadian dollar shows a comparatively unclear forex seasonality trend, but we do nonetheless note that the USDCAD has actually fallen in 5 of the last.
Worldwide activity is consistent with expectations, linearity and seasonality, and US Federal spending is strengthening from Q1 as expected, with the traditional majority of spend targeted for Q3.