NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.39 [2010] >
IJRSP Vol.39(5) [October 2010] >

Title: Effect of solar wind speed variations on other interplanetary parameters
Authors: Dwivedi, Vidya Charan
Pandey, V S
Tiwari, D P
Agrawal, S P
Keywords: Solar wind
Interplanetary magnetic field
Geomagnetic field
Correlation study
Issue Date: Oct-2010
Publisher: NISCAIR-CSIR, India
PACS No.: 96.60.Vg; 96.50.Bh
Abstract: The daily values of interplanetary solar wind parameters as well as that of the geomagnetic disturbance index (Ap) have been used for the years 1965-2006. Long-term averages have been calculated for all those days when simultaneous data is available for all these parameters (V, B, Bz and Ap). Earlier reports have usually underlined the importance of V in producing terrestrial effects. As such, individual days have been grouped, in accordance with the limited range of V, in seven groups by the method of iteration using K-mean clustering (data mining) technique. Having selected days in each of the seven groups (ranges), the group averages, have been calculated for the entire period for V, B, VB and Ap along with their standard errors. The method has been further repeated for the individual solar cycles. These group averages have been used to investigate the statistical relationships between V, B, VB and Ap in different combinations. The results so obtained can be summarized as: (i) the monotonic increase of group average V is almost similar to that of increasing average values of Ap, and VB from groups 1 to 7; (ii) For each of the seven groups, VB vs Ap and B vs Ap have been always found to be better correlated (‘r’ larger) on a day-to-day basis, whereas V vs Ap has low values of ‘r’; (iii) the direction of Bz when negative is very much effective in producing larger Ap as compared to days when Bz is positive, in all the seven groups (more prominently in the last four groups of larger V). The statistical results obtained signify that the product VB is very effective in producing large scale geomagnetic disturbances.
Page(s): 252-256
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.39(5) [October 2010]

Files in This Item:

File Description SizeFormat
IJRSP 39(5) 252-256.pdf107.4 kBAdobe PDFView/Open
 Current Page Visits: 803 
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: 165783 since 01-Sep-2015  Last updated on 27-Jun-2016Webmaster: