Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Periodicities in data observed during the minimum and the rising phase of solar cycle 23; years 1996-1999
Autore:
Zieba, S; Maslowski, J; Michalec, A; Kulak, A;
Indirizzi:
Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland Jagiellonian Univ Krakow Poland PL-30244 Observ, PL-30244 Krakow, Poland
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 1, volume: 377, anno: 2001,
pagine: 297 - 311
SICI:
1432-0746(200110)377:1<297:PIDODT>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUNSPOT AREAS; RADIO-EMISSION; FUNDAMENTAL PERIOD; ACTIVITY INDEXES; BASAL COMPONENT; MAGNETIC-FIELD; TIME-SERIES; FLARES; FLUX; SUN;
Keywords:
Sun : activity; Sun : radio radiation; Sun : magnetic fields; Sun : rotation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Michalec, A Jagiellonian Univ, Astron Observ, Ul Orla 171, PL-30244 Krakow, Poland Jagiellonian Univ Ul Orla 171 Krakow Poland PL-30244 , Poland
Citazione:
S. Zieba et al., "Periodicities in data observed during the minimum and the rising phase of solar cycle 23; years 1996-1999", ASTRON ASTR, 377(1), 2001, pp. 297-311

Abstract

Three types of observations: the daily values of the solar radio flux at 7frequencies, the daily international sunspot number and the daily Stanfordmean solar magnetic field were processed in order to find all the periodicities hidden in the data. Using a new approach to the radio data, two time series were obtained for each frequency examined, one more sensitive to spot magnetic fields, the other to large magnetic structures not connected with sunspots. Power spectrum analysis of the data was carried out separately for the minimum (540 days from 1 March 1996 to 22 August 1997) and for the rising phase (708 days from 23 August 1997 to 31 July 1999) of the solar cycle 23. The Scargle periodograms obtained, normalized for the effect of autocorrelation, show the majority of known periods and reveal a clear difference between the periodicities found in the minimum and the rising phase. Wedetermined the rotation rate of the "active longitudes" in the rising phase as equal to 444.4 +/-4 nHz (26.(d)0 +/-0.(d)3). The results indicate thatappropriate and careful analysis of daily radio data at several frequencies allows the investigation of solar periodicities generated in different layers of the solar atmosphere by various phenomena related to the periodic emergence of diverse magnetic structures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 09:54:50