ELSEVIER Nuclear Physics B (Proc. Suppl.) 85 (2000) 52-57 IX PROCEEDINGS SUPPLEMENTS www.elsevier.nl/locate/npe The thermonuclear instability of the solar core Attila Grandpierre ~ aKonkoly Observatory P. O. Box 67, H-1525 Budapest, Hungary I present here a list of the most important astrophysical problems related to the energy and neutrino producing solar core. Attempting to find a physical connection between the solar activity and the nuclear processes of the solar core, I present the relation between the LOCAL thermal instability and the conditions in the solar core. The result show that if a mechanism would be able to produce a local heating above 10 a K, this perturbation would push the local region of the core into the instability regime. Tidal-electromagnetic inductive coupling may elicit such a large local heating. Some consequences of the dynamic solar model are discussed. 1. Astrophysical observations showing the dynamical nature of the Sun There exists a global phenomenon showing the dynamical nature of the Sun: the solar activity. The origin of solar activity points to the solar core [1]. Moreover, the magnetism of the Solar System's planets is linearly proportional to the tidal effects of their moons [2]. This phenomenon may indicate that the solar magnetism also is lin- early proportional to the tidal effects of the plan- ets. A remarkable list of unsolved, tantalising problems surfaced in the last decades in relation to the activity of the solar core, like: - the existence of rigid rotation of the "activity centres", "hot spots", "sunspot nests" ([3,4]) with a rotation rate of the rigidly rotating deep solar core. Are there rigid funnels from the core? - the global appearance of surface explosions, with 180 degree symmetry of active longitudes [5]. Does the core participate in the surface activity? - the slow rotation of the core, instead of 4-15 times of the surface rate it is only 0.7-1.3 of the surface rate. Does a coupling exist between the core and the surface? - the rotation rate of the inner core seems to correlate with the surface activity cycle [6]; - the nitrogen-enigma: N15/N 14 enhancement with 50% of the solar wind as measure in the Moon's surface in the last 3 x 109 years (instead of decrease, [7]). N 15 production: in hot CNO cy- cle, above 10s K. Are there hot and rigid funnels from the core? - the solar wind, and especially the active re- gions, are enhanced in all the heavy elements with Z > 2, relative to the general photosphere. Fe: > 20 enhancements, Ca: twofold, HeZ/He 4 < 10 000-fold enhancements. Fe production is possi- ble above 109 K. Are there hot and rigid volcanic funnels? - sudden changes of the giant cells set up si- multaneously with the rotation rate change of the background field, accompanied by the violent eruption of the solar activity and neutrino pro- duction [8]; - the more than 300 years correlation of the planetary tides with the sunspot number [9]. Do planetary tides trigger hot and rigid funnels from the solar core? - planetary co-alignments of the inner planets have periods around 11.2 years, coinciding with the average of the solar activity cycle [10]; - planetary co-alignments of the outer planets trigger a large amplitude motion of the mass cen- tre of the Solar System relative to the centre of the Sun with a period of 11.2 years [11]; - the dynamic solar model offers a natural so- lution to the solar neutrino problems and to the tantalising astrophysical problems of solar activ- ity and the solar core [1,10,12]; Basu [13] confirmed the earlier results of Basu [14] and MeNutt [15], finding a statistically significant (> 98%) correlation between the solar neutrino flux of Homestake and the mass-flux of 0920-5632/00/$ - see frontmatter© 2000 ElsevierScienceB.V. All rights reserved. PII S0920-5632(00)00481-3