Publications with NASA

S. Ashrafi, etal. “Evidence of Chaotic Pattern in Solar Flux through a Reproducible Sequence of Period-Doubling-Type Bifurcations,” Proceedings of Flight Mechanics/Estimation Theory Symposium, National Aeronautics and Space Administration, May 1991.

 

S. Ashrafi, etal. “Lyapunov Exponent of Solar Flux Time Series,” Proceedings of First Experimental Chaos Conference, June 1991.

 

S. Ashrafi, etal. “Future Mission Studies: Combining Schatten’s Solar Activity Prediction Model with a Chaotic Prediction Model,” National Aeronautics and Space Administration, November 1991.

 

S. Ashrafi, etal. “Techniques for Forecasting Solar Activity Directly From its Time Series,” Proceedings of Flight Mechanics/Estimation Theory Symposium, National Aeronautics and Space Administration, May 1992.

 

S. Ashrafi, etal. “Detecting and Disentangling Nonlinear Structure from Solar Flux Time Series,” 43rd Congress of the International Astronautical Federation, August 1992.

 

S. Ashrafi, etal. “Study of Solar Cycles Using Turbulent Dynamo,” NASA STI/Recon Technical Report, 1992.

 

S. Ashrafi, etal. “Solar Flux Forecasting Using Mutual Information with an Optimal Delay,” Advances in the Astronautical Sciences, American Astronautical Society, Vol. 84 Part II, 1993.

 

S. Ashrafi, etal. “Future Missions Studies - Combining Schatten’s Solar Activity” - Prepared for NASA, Goddard Space Flight Center, November 1991

 

S. Ashrafi, etal. “Future mission studies: Forecasting solar flux directly from its chaotic time series,” Flight Dynamics Division-Code 550, December 1991

 

S. Ashrafi, etal. “Future Mission Studies: Preliminary Comparisons of Solar Flux Models,” NASA, December 1991

 

S. Ashrafi, etal. “Nonlinear techniques for forecasting solar activity directly from its time series,” NASA, Flight Mechanics/Estimation Theory Symposium Goddard Space Flight Center, Maryland, May 5-7, 1992

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