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There are a total of 66 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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On Determining the Rise, Size, and Duration Classes of a Sunspot Cycle
Author(s): Wilson, Robert M.; Hathaway, David H.; Reichmann, Edwin J.
Abstract: The behavior of ascent duration, maximum amplitude, and period for cycles 1 to 21 suggests that they are not mutually independent. Analysis of the resultant three-dimensional contingency table for cycles divided according to ...
NASA Center: Marshall Space Flight Center
Publication Year: 1996
Added to NTRS: 2005-08-25
Accession Number: 96N34504; Document ID: 19960050464; Report Number: M-816, NAS 1.60:3652, NASA-TP-3652
Application of the Maximum Amplitude-Early Rise Correlation to Cycle 23
Author(s): Willson, Robert M.; Hathaway, David H.
Abstract: On the basis of the maximum amplitude-early rise correlation, cycle 23 could have been predicted to be about the size of the mean cycle as early as 12 mo following cycle minimum. Indeed, estimates for the size of cycle 23 ...
NASA Center: Marshall Space Flight Center
Publication Year: 2004
Added to NTRS: 2005-08-25
Document ID: 20040110974; Report Number: M-1113, NASA/TP-2004-213281
On the Correlation Between Maximum Amplitude and Smoothed Monthly Mean Sunspot Number during the Rise of the Cycle (from t = 0-48 months Past Sunspot Minimum)
Author(s): Wilson, Robert M.; Hathaway, David H.; Reichmann, Edwin J.
Abstract: During the rise from sunspot minimum to maximum, the observed value of smoothed monthly mean sunspot number at maximum RM is found to correlate with increasing strength against the current value of smoothed monthly mean ...
NASA Center: Marshall Space Flight Center
Publication Year: 1998
Added to NTRS: 2005-08-25
Document ID: 19980221814; Report Number: M-888, NAS 1.60:208591, NASA/TP-1998-208591
Gauging the Nearness and Size of Cycle Minimum
Author(s): Wilson, Robert M.; Hathaway, David H.; Reichmann, Edwin J.
Abstract: By definition, the conventional onset for the start of a sunspot cycle is the time when smoothed sunspot number (i.e., the 12-month moving average) has decreased to its minimum value (called minimum amplitude) prior to the ...
NASA Center: Marshall Space Flight Center
Publication Year: 1997
Added to NTRS: 2005-08-25
Accession Number: 97N18137; Document ID: 19970014934; Report Number: M-828, NAS 1.60:3674, NASA-TP-3674
Erratum: Evidence That a Deep Meridional Flow Sets the Sunspot Cycle Period
Author(s): Hathaway, David H.; Nandy, Dibyendu; Wilson, Robert M.; Reichmann, Edwin J.
Abstract: An error was made in entering the data. This changes the results concerning the length of the time lag between the variations in the meridional flow speed and those in the cycle amplitude. The final paragraph on page 667 ...
NASA Center: Marshall Space Flight Center
Publication Year: 2004
Added to NTRS: 2005-01-25
Document ID: 20050019491
What the Sunspot Record Tells Us About Space Climate
Author(s): Hathaway, David H.; Wilson, Robert M.
Abstract: The records concerning the number, sizes, and positions of sunspots provide a direct means of characterizing solar activity over nearly 400 years. Sunspot numbers are strongly correlated with modem measures of solar activity ...
NASA Center: Marshall Space Flight Center
Publication Year: 2004
Added to NTRS: 2004-11-10
Document ID: 20040129695
The shape of the sunspot cycle
Author(s): Hathaway, David H.; Wilson, Robert M.; Reichmann, Edwin J.
Abstract: The temporal behavior of a sunspot cycle, as described by the International sunspot numbers, can be represented by a simple function with four parameters: starting time, amplitude, rise time, and asymmetry. Of these, the ...
NASA Center: Marshall Space Flight Center
Publication Year: 1994
Added to NTRS: 2004-11-03
Accession Number: 95A60944; Document ID: 19950029345
Temporal filters for isolating steady photospheric flows
Author(s): Hathaway, David H.
Abstract: A variety of temporal filters are tested on artificial data with 60 and 75 s sampling intervals to determine their accuracy in separating the nearly-steady photospheric flows from the p-mode oscillations in Doppler velocity ...
NASA Center: Marshall Space Flight Center
Publication Year: 1988
Added to NTRS: 2004-11-03
Accession Number: 89A19059; Document ID: 19890031688
The Photospheric Convection Spectrum
Author(s): Hathaway, David H.
Abstract: Spectra of the photospheric cellular flows are determined from Solar and Heliospheric Observatory/Michelson Doppler Imager (SOHO/MDI) observations. Spherical harmonic decompositions are obtained from the full-disc ...
NASA Center: Marshall Space Flight Center
Publication Year: 1999
Added to NTRS: 2004-11-03
Document ID: 19990115941
Spherical harmonic analysis of steady photospheric flows
Author(s): Hathaway, David H.
Abstract: A technique is presented in which full disk Doppler velocity measurements are analyzed using spherical harmonic functions to determine the characteristics of the spectrum of spherical harmonic modes and the nature of steady ...
NASA Center: Marshall Space Flight Center
Publication Year: 1987
Added to NTRS: 2004-11-03
Accession Number: 87A43876; Document ID: 19870056602
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