The 22-year cycle in the geomagnetic 27-day recurrences reflecting on the F2-layer ionization

E. M. Apostolov, D. Altadill, M. Todorova

Producción científica: Artículo en revista indizadaArtículorevisión exhaustiva

19 Citas (Scopus)

Resumen

Solar cycle variations of the amplitudes of the 27-day solar rotation period reflected in the geomagnetic activity index Ap, solar radio flux F10.7 cm and critical frequency foF2 for mid-latitude ionosonde station Moscow from the maximum of sunspot cycle 18 to the maximum of cycle 23 are examined. The analysis shows that there are distinct enhancements of the 27-day amplitudes for foF2 and Ap in the late declining phase of each solar cycle while the amplitudes for F10.7 cm decrease gradually, and the foF2 and Ap amplitude peaks are much larger for even-numbered solar cycles than for the odd ones. Additionally, we found the same even-high and odd-low pattern of foF2 for other mid-latitude ionosonde stations in Northern and Southern Hemispheres. This property suggests that there exists a 22-year cycle in the F2-layer variability coupled with the 22-year cycle in the 27-day recurrence of geomaggnetic activity.

Idioma originalInglés
Páginas (desde-hasta)1171-1176
Número de páginas6
PublicaciónAnnales Geophysicae
Volumen22
N.º4
DOI
EstadoPublicada - 2004
Publicado de forma externa

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