NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.35 [2006] >
IJRSP Vol.35(5) [October 2006] >

Title: Long-term variations of solar, interplanetary, geomagnetic indices and comic ray intensities—A brief tutorial
Authors: Kane, R P
Keywords: Solar indices
Geomagnetic index
Cosmic ray intensity
Interplanetary magnetic field.
Issue Date: Oct-2006
Publisher: CSIR
Abstract: The long-term variations of the 12-month running means of several solar, interplanetary and geomagnetic parameters during the last several sunspot cycles revealed that during cycles 11-23 (1868-2004), the geomagnetic ⍺⍺ index showed several peaks within 3-5 years around the sunspot maxima, with some peaks during the declining phases of the sunspot cycles, whereas the sunspot numbers Rz showed smooth but broad maxima for 2-3 years in each cycle. The calcium plage area also showed multiple peaks but none in the declining phases. The 11-yr running means showed very good parallelism between Rz, ⍺⍺ index and global sea-surface temperature (SST). During 1940-2004, Rz and F10 (2800 MHz radio emission) showed similar 11-yr fluctuations of varying amplitudes, but coronal index, CI, showed monotonically increasing amplitudes by almost a factor of two. The open magnetic flux emanating from the sun during 1968-2004 showed long-term fluctuations, very different at low and high solar latitudes. The variations of the fluxes at low latitude (0-45o) were almost parallel to the sunspot cycle (there was a slight N-S asymmetry), while fluxes at high latitudes (45o-90o) were almost anti-parallel to the sunspot cycle. Cosmic ray neutron monitor intensities at Climax were well anti-correlated with sunspot cycle and interplanetary magnetic field (B), but poorly correlated with interplanetary number density (N), solar wind speed (V), and geomagnetic index ⍺⍺. The geomagnetic index ⍺⍺ was best correlated with the product VB.
Page(s): 312-323
ISSN: 0367-8393
Source:IJRSP Vol.35(5) [October 2006]

Files in This Item:

File Description SizeFormat
IJRSP 35(5) 312-323.pdf382.54 kBAdobe PDFView/Open
 Current Page Visits: 94 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 162948 since 01-Sep-2015  Last updated on 21-Jun-2016Webmaster: