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Titolo:
Period and phase comparisons of near-decadal oscillations in solar, geomagnetic, and cosmic ray time series
Autore:
Juckett, DA;
Indirizzi:
Barros Res Inst, Holt, MI USA Barros Res Inst Holt MI USABarros Res Inst, Holt, MI USA Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 Chem, E Lansing, MI 48824 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A9, volume: 106, anno: 2001,
pagine: 18651 - 18665
SICI:
0148-0227(20010901)106:A9<18651:PAPCON>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGULAR-SPECTRUM ANALYSIS; SURFACE MAGNETIC-FIELD; DIFFERENTIAL ROTATION; ATMOSPHERIC C-14; MAUNDER MINIMUM; CORONAL INDEX; CYCLE; PERIODICITIES; ASYMMETRY; SCALE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Juckett, DA Barros Res Inst, 2430 Coll Rd, Holt, MI USA Barros Res Inst 2430 Coll Rd Holt MI USA oll Rd, Holt, MI USA
Citazione:
D.A. Juckett, "Period and phase comparisons of near-decadal oscillations in solar, geomagnetic, and cosmic ray time series", J GEO R-S P, 106(A9), 2001, pp. 18651-18665

Abstract

A more complete understanding of the periodic dynamics of the Sun requirescontinued exploration of non-11-year oscillations in addition to the benchmark 11-year sunspot cycle. In this regard, several solar, geomagnetic, andcosmic ray time series were examined to identify common spectral components and their relative phase relationships. Several non-11-year oscillations were identified within the near-decadal range with periods of similar to 8,10, 12, 15, 18, 22, and 29 years. To test whether these frequency components were simply low-level noise or were related to a common source, the phases were extracted for each component in each series. The phases were nearlyidentical across the solar and geomagnetic series, while the correspondingcomponents in four cosmic ray surrogate series exhibited inverted phases, similar to the known phase relationship with the 11-year sunspot cycle. Cluster analysis revealed that this pattern was unlikely to occur by chance. It was concluded that many non-11-year oscillations truly exist in the solardynamical environment and that these contribute to the complex variations observed in geomagnetic and cosmic ray time series. Using the different energy sensitivities of the four cosmic ray surrogate series, a preliminary indication of the relative intensities of the various solar-induced oscillations was observed. It provides evidence that many of the non-11-year oscillations result from weak interplanetary magnetic field/solar wind oscillations that originate from corresponding variations in the open-field regions ofthe Sun.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 16:16:59