scholarly journals Author Correction: Novel insights on the geomagnetic field in West Africa from a new intensity reference curve (0–2000 AD)

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lisa Kapper ◽  
Vincent Serneels ◽  
Sanja Panovska ◽  
Rafael García Ruíz ◽  
Gabrielle Hellio ◽  
...  
Keyword(s):  
West Africa ◽  
Geomagnetic Field ◽  
Reference Curve

scholarly journals Novel insights on the geomagnetic field in West Africa from a new intensity reference curve (0-2000 AD)

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lisa Kapper ◽  
Vincent Serneels ◽  
Sanja Panovska ◽  
Rafael García Ruíz ◽  
Gabrielle Hellio ◽  
...  
Keyword(s):  
West Africa ◽  
Geomagnetic Field ◽  
Reference Curve

scholarly journals Archaeointensity results spanning the past 6 kiloyears from eastern China and implications for extreme behaviors of the geomagnetic field

2016 ◽  
Vol 114 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Shuhui Cai ◽  
Guiyun Jin ◽  
Lisa Tauxe ◽  
Chenglong Deng ◽  
Huafeng Qin ◽  
...  
Keyword(s):  
Geomagnetic Field ◽  
Dipole Moments ◽  
Eastern China ◽  
Published Data ◽  
Reference Curve ◽  
The Holocene ◽  
The Past ◽  
Deep Interior ◽  
Archaeomagnetic Dating ◽  
Data Points

Variations of the Earth’s geomagnetic field during the Holocene are important for understanding centennial to millennial-scale processes of the Earth’s deep interior and have enormous potential implications for chronological correlations (e.g., comparisons between different sedimentary recording sequences, archaeomagnetic dating). Here, we present 21 robust archaeointensity data points from eastern China spanning the past ∼6 kyr. These results add significantly to the published data both regionally and globally. Taking together, we establish an archaeointensity reference curve for Eastern Asia, which can be used for archaeomagnetic dating in this region. Virtual axial dipole moments (VADMs) of the data range from a Holocene-wide low of ∼27 to “spike” values of ∼166 ZAm2(Z: 1021). The results, in conjunction with our recently published data, confirm the existence of a decrease in paleointensity (DIP) in China around ∼2200 BCE. These low intensities are the lowest ever found for the Holocene and have not been reported outside of China. We also report a spike intensity of 165.8 ± 6.0 ZAm2at ∼1300 BCE (±300 y), which is either a prelude to or the same event (within age uncertainties) as spikes first reported in the Levant.

scholarly journals Induction effects of geomagnetic disturbances in the geo-electric field variations at low latitudes

2017 ◽  
Vol 35 (1) ◽  
pp. 39-51 ◽  
Author(s):  
Vafi Doumbia ◽  
Kouadio Boka ◽  
Nguessan Kouassi ◽  
Oswald Didier Franck Grodji ◽  
Christine Amory-Mazaudier ◽  
...  
Keyword(s):  
Solar Flare ◽  
Electric Field ◽  
West Africa ◽  
Geomagnetic Storm ◽  
Geomagnetic Field ◽  
Equatorial Electrojet ◽  
Geomagnetic Disturbances ◽  
The North ◽  
Low Latitudes ◽  
Dip Equator

Abstract. In this study we examined the influences of geomagnetic activity on the Earth surface electric field variations at low latitudes. During the International Equatorial Electrojet Year (IEEY) various experiments were performed along 5° W in West Africa from 1992 to 1995. Among other instruments, 10 stations equipped with magnetometers and telluric electric field lines operated along a meridian chain across the geomagnetic dip equator from November 1992 to December 1994. In the present work, the induced effects of space-weather-related geomagnetic disturbances in the equatorial electrojet (EEJ) influence area in West Africa were examined. For that purpose, variations in the north–south (Ex) and east–west (Ey) components of telluric electric field were analyzed, along with that of the three components (H,  D and Z) of the geomagnetic field during the geomagnetic storm of 17 February 1993 and the solar flare observed on 4 April 1993. The most important induction effects during these events are associated with brisk impulses like storm sudden commencement (ssc) and solar flare effect (sfe) in the geomagnetic field variations. For the moderate geomagnetic storm that occurred on 17 February 1993, with a minimum Dst index of −110 nT, the geo-electric field responses to the impulse around 11:00 LT at LAM are Ex =  520 mV km−1 and Ey =  400 mV km−1. The geo-electric field responses to the sfe that occurred around 14:30 LT on 4 April 1993 are clearly observed at different stations as well. At LAM the crest-to-crest amplitude of the geo-electric field components associated with the sfe are Ex =  550 mV km−1 and Ey =  340 mV km−1. Note that the sfe impact on the geo-electric field variations decreases with the increasing distance of the stations from the subsolar point, which is located at about 5.13° N on 4 April. This trend does not reflect the sfe increasing amplitude near the dip equator due the high Cowling conductivity in the EEJ belt.

scholarly journals Directional changes of the geomagnetic field in West Africa: Insights from the metallurgical site of Korsimoro

2015 ◽  
Vol 430 ◽  
pp. 349-355 ◽  
Author(s):  
Fabio Donadini ◽  
Vincent Serneels ◽  
Lisa Kapper ◽  
Akram El Kateb
Keyword(s):  
West Africa ◽  
Geomagnetic Field

scholarly journals Reconstructing the Geomagnetic Field in West Africa: First Absolute Intensity Results from Burkina Faso

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Lisa Kapper ◽  
Fabio Donadini ◽  
Vincent Serneels ◽  
Evdokia Tema ◽  
Avto Goguitchaichvili ◽  
...  
Keyword(s):  
West Africa ◽  
Burkina Faso ◽  
Geomagnetic Field ◽  
Absolute Intensity

Reuse of medieval bricks as important limitation for construction of geomagnetic secular variation curves based on archeomagnetic studies of brick buildings in Poland. 

2021 ◽  
Author(s):  
Jerzy Nawrocki ◽  
Karol Standzikowski ◽  
Tomasz Werner ◽  
Maria Łanczont ◽  
Jan Gancarski ◽  
...  
Keyword(s):  
Geomagnetic Field ◽  
Reference Curve ◽  
Remarkable Difference ◽  
Historical Buildings ◽  
Geomagnetic Secular Variation ◽  
Se Poland ◽  
Secular Variations ◽  
Science Centre ◽  
National Science ◽  
Expected Values

<p>The bricks can be one of the best material for archeomagnetic studies. Their backing technique (i.e. horizontal location in the furnace) allow to determine also the value of inclination of geomagnetic field.  However, reuse of older bricks for the construction of newer objects can limit the utility of this material in archeomagnetic studies. A set of the brick samples from 26 historical buildings in SE Poland was taken for archeomagnetic investigations. As a result of this study, the secular variations of palaeointensity and inclination of the geomagnetic field from 1200 to 1800 AD were defined for this part of Poland. The paleointensity of geomagnetic field  was determined using the IZZI-Thellier-Thellier protocol. The course of the new regional palaeosecular curves is approximately the same as so far obtained in other parts of Europe. Data obtained from four brick buildings, however, do not fit substantially to the reference European curves. The remarkable difference  is a rapid and deeper drop of inclination and significantly higher than expected values of  palaeointensity. These features indicate that bricks used for the construction of these buildings (dated on XVI – XVII centuries) were taken from older brick constructions, most probably from the Gothic time (XIII/XIV c.). We compared our data with the earlier data obtained from brick buildings in N Poland. The regional archeomagnetic curves calculated for these two regions of Poland are completely different in their segments as old as the first half of the 18<sup>th</sup> century. This fact could be explained by the reuse of medieval bricks during the construction of studied objects from N Poland (dated on the first half of the 18<sup>th</sup> century) and applied for the construction of reference curve or by later secondary heating of original bricks.</p><p>This research was supported by  the National Science Centre of Poland (project no: UMO-2016/23/B/ST10/0129).</p>

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