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Title: Secular changes in the solar terrestrial conditions observed during sunspot minima: Some implications for the earth’s ionosphere
Authors: Girish, T E
Gopkumar, G
Keywords: Sunspot minima
Galactic cosmic ray flux
Solar energetic particle occurrence
Long deep solar minimum occurrence
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
Abstract: The paper presents the evolution of solar and geomagnetic conditions, galactic cosmic ray flux, and solar energetic particle occurrences from one sunspot minima to another starting from Maunder minimum period up to the recent long deep minimum between solar cycles 23 and 24. The study seems to confirm the Gleissberg periodicity of 90-100 years for the occurrence of long deep solar minimum and long term trends in these parameters. Their implications on the earth’s ionosphere are discussed in this paper. In addition, possible ionospheric effects of weak geomagnetic disturbances, large proton events, lightning and seismic phenomena occurring during the deep solar minima epochs are discussed.
Description: 83-88
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.41(2) [April 2012]

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