Heliomagnetic and geomagnetic activity cycles on millennial timescales

作者：J. Beer, K. G. McCracken, Florian Adolphi, Marcus Christl, Hubertus Fischer, Heinrich Miller, Raimund Muscheler, Hans‐Arno Synal, Frank Wilhelms · 发表于：Quaternary Science Reviews · 年份：2025 · DOI：10.1016/j.quascirev.2025.109364 · 被引用次数：3 · 研究领域：Geomagnetism and Paleomagnetism Studies、Solar and Space Plasma Dynamics、Geology and Paleoclimatology Research

We report 17 new solar activity cycles with periodicities ranging from 1,700 to 18,000 years. Using Bayesian spectral analysis we determined for each cycle period, amplitude and phase for the past 145,000 years. These results were obtained by analyzing 10 Be in the 2775 m long EDML ice core from Dronning Maud Land, Antarctica. In addition, we have augmented the 10 Be data with synchronous ice accumulation and δ 18 O data obtained from the same ice core; with paleomagnetic dipole moment data derived mainly from ocean sediments; and with calculated global insolation data. There is a close agreement between the 10 Be periodicities in the first and the last 70 kyr intervals. We have developed a new analytical technique we call the “frequency domain differentiation technique” (FDDT) that distinguishes between the periodicities due to (a) variations in the cosmic ray intensity and (b) climate effects related to the accumulation rate. In a first step we have calculated the 10 Be flux and then selected all periodicities which are common within 1 % in at least 2 of the investigated parameters ( 10 Be concentration, 10 Be flux, accumulation rate, δ 18 O, and insolation). Using these data we identified a total of 42 statistically significant periodicities. 20 of them are found in the 10 Be concentration which we separated into 3 groups of origins: Four due to 10 Be production only (group 1: 18012, 6508, 5782, 3833 yr), thirteen being a combination of production and accumulation related ...