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Title: Distortion of a 27-day sequence of solar indices
Authors: Kane, R P
Keywords: Solar activity;Solar indices
Issue Date: Jun-2004
Publisher: NISCAIR-CSIR, India
PACS No.: 96.60.Ly; 96.60.Qc
Abstract: The interval 20 Feb.- 4 July 1998 had strong ~27-day oscillations, almost simultaneously, in various solar indices. Counting 20 Feb. 1998 as day number 1, the peaks occurred near day numbers 4, (27) 31, (18) 49, (27) 76, (8) 84, (24) 108,(27) 135, where the numbers in parantheses are the spacings in days. The first two peaks had a separation of 27 days, but the next peak was only 18 days away, heralding probably the commencement of a new, second sequence. The next peak was 27 days away which was the part of this second sequence, but the peak next to that was only 8 days away, indicating that the second sequence terminated. However, the next peaks were such that they fitted nicely as if the first sequence restarted (4,31,58 missed, 84,108,135), indicating that some sequences can remain dormant for a cycle or two and then reappear. The peaks at 4,31, 49,76, 84,108, 135 were qualitatively the same for several solar indices, but their quantitative evolution was different for different indices.
Page(s): 149-157
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.33(3) [June 2004]

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