Northern Glacial Chronology: Quaternary Glaciations in the Northern Hemisphere.

Science ◽  
1987 ◽  
Vol 236 (4808) ◽  
pp. 1581-1582
Author(s):  
H. E. WRIGHT
Keyword(s):  
Northern Hemisphere ◽  
Glacial Chronology ◽  
Quaternary Glaciations

scholarly journals Upper Pleistocene deposits of the Comprida Island (São Paulo State) dated by thermoluminescence method

2003 ◽  
Vol 75 (1) ◽  
pp. 91-96 ◽  
Author(s):  
KENITIRO SUGUIO ◽  
SONIA H. TATUMI ◽  
EMÍLIA A. KOWATA ◽  
CASIMIRO S. MUNITA ◽  
ROSEMEIRE P. PAIVA
Keyword(s):  
Northern Hemisphere ◽  
Depositional Environments ◽  
The Other ◽  
Upper Pleistocene ◽  
The Real ◽  
Paulo State ◽  
Other Hand ◽  
Geological Map ◽  
Southern Extremity ◽  
Quaternary Glaciations

The Cananéia (Upper Pleistocene) and the Comprida Island (Holocene) formations, outcropping in the Comprida island (SP) have been mapped using geomorphological and lithological criteria. Only one sample of the Cananéia Formation, collected in the homonymous island in front of the Comprida Island, was beyond the limit of the standard radiocarbon method. But since the publication of the geological map of the area in 1978, there has been some doubt on the real occurrence of Pleistocene deposits in southern extremity of Comprida Island. This paper deals with the results of thermoluminescence (TL) ages of eight samples from Comprida Island, which corroborate the Pleistocene age assumed during mapping surveys of these deposits. On the other hand, possible interpretations of the obtained ages, in relation to their depositional environments and related northern hemisphere Quaternary glaciations, are presented.

Correlation of Quaternary glaciations in the Northern Hemisphere

1986 ◽  
Vol 5 ◽  
pp. 509-510 ◽  
Author(s):  
D BOWEN
Keyword(s):  
Northern Hemisphere ◽  
Quaternary Glaciations

Alpha-Effect, Current and Kinetic Helicities for Magnetically Driven Turbulence, and Solar Dynamo

2000 ◽  
Vol 179 ◽  
pp. 387-388
Author(s):  
Gaetano Belvedere ◽  
V. V. Pipin ◽  
G. Rüdiger
Keyword(s):  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Convection Zone ◽  
Solar Surface ◽  
Momentum Transport ◽  
Angular Momentum Transport ◽  
Magnetic Buoyancy ◽  
Alpha Effect ◽  
Current Helicity

Extended AbstractRecent numerical simulations lead to the result that turbulence is much more magnetically driven than believed. In particular the role ofmagnetic buoyancyappears quite important for the generation ofα-effect and angular momentum transport (Brandenburg & Schmitt 1998). We present results obtained for a turbulence field driven by a (given) Lorentz force in a non-stratified but rotating convection zone. The main result confirms the numerical findings of Brandenburg & Schmitt that in the northern hemisphere theα-effect and the kinetic helicityℋkin= 〈u′ · rotu′〉 are positive (and negative in the northern hemisphere), this being just opposite to what occurs for the current helicityℋcurr= 〈j′ ·B′〉, which is negative in the northern hemisphere (and positive in the southern hemisphere). There has been an increasing number of papers presenting observations of current helicity at the solar surface, all showing that it isnegativein the northern hemisphere and positive in the southern hemisphere (see Rüdigeret al. 2000, also for a review).

The Hemispheric Sign Rule of Current Helicity during the Rising Phase of Cycle 23

2000 ◽  
Vol 179 ◽  
pp. 303-306
Author(s):  
S. D. Bao ◽  
G. X. Ai ◽  
H. Q. Zhang
Keyword(s):  
Solar Cycle ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Active Regions ◽  
Hemispheric Preference ◽  
Current Helicity

AbstractWe compute the signs of two different current helicity parameters (i.e., αbestandHc) for 87 active regions during the rise of cycle 23. The results indicate that 59% of the active regions in the northern hemisphere have negative αbestand 65% in the southern hemisphere have positive. This is consistent with that of the cycle 22. However, the helicity parameterHcshows a weaker opposite hemispheric preference in the new solar cycle. Possible reasons are discussed.

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