摘要：Typical reconstructions of historic heliospheric magnetic field (HMF)BHMFare based on the analysis of the sunspot activity, geomagnetic data or on measurement of cosmogenic isotopes stored in terrestrial reservoirs like trees (14C) and ice cores (10Be). The various reconstructions ofBHMFare however discordant both in strength and trend. Cosmogenic isotopes, which are produced by galactic cosmic rays impacting on meteoroids and whose production rate is modulated by the varying HMF convected outward by the solar wind, may offer an alternative tool for the investigation of the HMF in the past centuries. In this work, we aim to evaluate the long-term evolution ofBHMFover a period covering the past twenty-two solar cycles by using measurements of the cosmogenic44Ti activity (τ1∕2= 59.2 ± 0.6 yr) measured in 20 meteorites which fell between 1766 and 2001. Within the given uncertainties, our result is compatible with a HMF increase from 4.87-0.30+0.24nT in 1766 to 6.83-0.11+0.13nT in 2001, thus implying an overall average increment of 1.96-0.35+0.43nT over 235 years since 1766 reflecting the modern Grand maximum. TheBHMFtrend thus obtained is then compared with the most recent reconstructions of the near-Earth HMF strength based on geomagnetic, sunspot number, and cosmogenic isotope data.
关键词：KeywordsenSun: magnetic fieldssolar-terrestrial relationsmeteorites, meteors, meteoroids
