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Titolo:
Heliospheric modulation of cosmic rays and solar activity during the Maunder minimum
Autore:
Usoskin, IG; Mursula, K; Kovaltsov, GA;
Indirizzi:
Oulu Univ, Sodankyla Geophys Observ, Oulu Unit, Dept Phys Sci, FIN-90014 Oulu, Finland Oulu Univ Oulu Finland FIN-90014 Dept Phys Sci, FIN-90014 Oulu, Finland AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia AF Ioffe Phys Tech Inst St Petersburg Russia 194021 sburg 194021, Russia
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A8, volume: 106, anno: 2001,
pagine: 16039 - 16046
SICI:
0148-0227(20010801)106:A8<16039:HMOCRA>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
GEOMAGNETIC-ACTIVITY; 22-YEAR MODULATION; SUNSPOT NUMBERS; 11-YEAR CYCLE; POLAR ICE; BE-10; WIND; C-14; SUN; RECONSTRUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Usoskin, IG Oulu Univ, Sodankyla Geophys Observ, Oulu Unit, Dept Phys Sci,POB 3000, FIN-90014 Oulu, Finland Oulu Univ POB 3000 Oulu Finland FIN-90014 90014 Oulu, Finland
Citazione:
I.G. Usoskin et al., "Heliospheric modulation of cosmic rays and solar activity during the Maunder minimum", J GEO R-S P, 106(A8), 2001, pp. 16039-16046

Abstract

Modern models and direct cosmic ray experiments deal with heliospheric modulation of cosmic rays only during the recent times of rather high overall solar activity level. On the other hand, the question of cosmic ray modulation during the exceptional conditions of very quiet heliosphere is important. In the present paper we compare the variations of cosmic ray intensity with solar and auroral activity during the Maunder minimum (1645-1715) when the Sun was extremely quiet. We use the newly presented group sunspot number series as a measure of early solar activity, the auroral observations in central Europe as an indicator of transient phenomena, in the inner heliosphere, and the radiocarbon data as a proxy of cosmic ray intensity. We find that both cosmic ray intensity and auroral activity closely follow the dominant 22-year cyclicity with sunspot activity during the Maunder minimum. Moreover, the strict; antiphase between the 22-year variation of cosmic ray intensity and sunspot activity suggests that the 22-year variation in cosmicray intensity can be explained by the diffusion-dominated terms of cosmic ray modulation without significant; drift effects. We also discuss the possible origin of the behavior of the Be-10 data which is different from all other parameters during the Maunder minimum.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 01:10:12