21st Conference on Hydrology


Qualitative Comparison Between the Temporal Variation of Streamflow Index and Solar Flux Level: Continued Study and Analysis

Brenda Zuzolo, The Boeing Company, Springfield, VA

This paper summarizes a continued qualitative comparison between daily streamflow indices of specified Continental US riversheds and the daily solar flux level. These two data parameters were initially chosen for study because the streamflow level is dependent on the cyclonic system frequency and the solar flux level is linked to cyclonic systems according to the mechanism described in (1). In this paper the streamflow index published by the U.S. Geological Survey (USGS) (2) and the F10.7 centimeter (2800 MHz) solar flux (3) are compared, with data collection and analysis continued from the earlier paper. The earlier initial study uncovered a general correlation between solar flux variations and stream flow index changes. The general assumption governing the comparison discussed is: increased solar flux level intensifies cyclonic, precipitation producing, systems (1) which, after a corresponding lag period to allow for drainage, results in increased streamflow in river systems. Thus an observed increase in the F10.7 centimeter (2800 MHz) solar flux level is expected to result in a corresponding, lagged increase in the streamflow index. A graphical summary of the data and the corresponding observations relating to the solar-terrestrial coupling mechanism are presented.

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Session 5B, Drought Assessment and Prediction
Thursday, 18 January 2007, 8:30 AM-11:45 AM, 211

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