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The 22-year Cycle in the Geomagnetic 27-day Recurrences Reflecting on the F2-layer Ionization : Volume 22, Issue 4 (02/04/2004)

By Apostolov, E. M.

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Book Id: WPLBN0003987436
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: The 22-year Cycle in the Geomagnetic 27-day Recurrences Reflecting on the F2-layer Ionization : Volume 22, Issue 4 (02/04/2004)  
Author: Apostolov, E. M.
Volume: Vol. 22, Issue 4
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Altadill, D., Todorova, M., & Apostolov, E. M. (2004). The 22-year Cycle in the Geomagnetic 27-day Recurrences Reflecting on the F2-layer Ionization : Volume 22, Issue 4 (02/04/2004). Retrieved from http://members.worldlibrary.net/


Description
Description: Observatorio del Ebro, (URL-CSIC), Horta Alta 38, E43520 Roquetes, Spain. Solar cycle variations of the amplitudes of the 27-day solar rotation period reflected in the geomagnetic activity index Ap, solar radio flux F10.7cm 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 F10.7cm 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 geomagnetic activity.

Key words. Ionosphere (mid-latitude ionosphere; ionosphere- magnetosphere interactions) – Magnetospheric physics (solar wind-magnetosphere interactions)


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

 

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