Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005soph..229..387k&link_type=abstract
Solar Physics, Volume 229, Issue 2, pp.387-407
Physics
10
Scientific paper
Gnevyshev [Solar Phys. 1, 107, 1967] showed that in solar cycle 19 (1954 1965), the coronal line half-yearly average intensity at 5303 Å (green line) had actually two maxima, the first one in 1957 and the second in 1959 1960. In the present communication, the structures at solar maxima were reexamined in detail. It was noted that the two-peak structure of solar indices near sunspot (Rz) maxima was only a crude approximation. On a finer time scale (monthly values), there were generally more than three peaks, with irregular peak separations in a wide range of ˜12± 6 months. The sequences were seen simultaneously (within a month or two) at many solar indices (notably the 2800 MHz radio flux) at and above the photosphere, and these can be legitimately termed ‘Gnevyshev peaks’ and ‘Gnevyshev gaps’. The open magnetic flux emanating from the Sun showed this sequence partially, some peaks matching, others not. In interplanetary space, the interplanetary parameters N (number density), V (solar wind speed), B (magnetic field) showed short-time peak structures but mostly not matching with the Rz peaks. Geomagnetic indices (aa, Dst) had peaked structures, which did not match with Rz peaks but were very well related to V and B, particularly to the product VB. The cosmic ray (CR) modulation also showed peaks and troughs near sunspot maximum, but the matching with Rz peaks was poor. Hence, none of these can be termed Gnevyshev peaks and gaps, particularly the gap between aa peaks, one near sunspot maximum and another in the declining phase, as this gap is qualitatively different from the Gnevyshev gap in solar indices.
No associations
LandOfFree
Which One is the `GNEVYSHEV' GAP? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Which One is the `GNEVYSHEV' GAP?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Which One is the `GNEVYSHEV' GAP? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1469653