Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion
Extreme geomagnetic variations such as excursions where the magnetic poles shift, and return are not fully understood. 10Be, used as a proxy for the magnetic field studies has been proposed as a compliment to paleomagnetic models, allowing adjustments. LSMOD.2 is a sediment and volcanic based magnet...
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Lunds universitet/Geologiska institutionen
2024
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ftulundlupsp:oai:lup-student-papers.lub.lu.se:9163247 2024-09-09T19:10:43+00:00 Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion Rydh, Alexander 2024 application/pdf http://lup.lub.lu.se/student-papers/record/9163247 eng eng Lunds universitet/Geologiska institutionen http://lup.lub.lu.se/student-papers/record/9163247 Cosmic rays · Cosmogenic Radionuclides · Paleomagnetism · Laschamps excursion · 10Be Earth and Environmental Sciences M2 2024 ftulundlupsp 2024-06-19T00:12:44Z Extreme geomagnetic variations such as excursions where the magnetic poles shift, and return are not fully understood. 10Be, used as a proxy for the magnetic field studies has been proposed as a compliment to paleomagnetic models, allowing adjustments. LSMOD.2 is a sediment and volcanic based magnetic model encompassing the Laschamps excursion ~41 000 years ago. LSMOD.2 is limited due to lacking data from the high latitudes and the southern hemisphere, creating uncertainties in the model. To investigate the usefulness of 10Be data, corrections must be made for climate variability, affecting the transport and deposition of 10Be, as well as filtering for solar activity, occurring as millennial and centennial variations. In this study, 10Be flux data shows good agreement with LSMOD.2 between 40.5 to 41.2 ka. After 41.2 ka the Greenland and Antarctica data diverge in 10Be production rates with LSMOD.2. Comparing 10Be data with other magnetic field reconstructions shows that LSMOD.2 has the best agreement over a period ca. 700 years. However, while LSMOD.2 does show the best agreement with 10Be data, none of the investigated magnetic field models show an overall good agreement with 10Be data or each other, thus 10Be data is limited to uses for local models e.g. northern hemisphere. Har du någonsin hört talas om en supernova? En exploderande stjärna som kastar ut högenergetiska partiklar. Inte nog med det så färdas även dessa partiklar genom hela galaxen. Galaxer är stora och endast några ut av partiklarna når vår jord. Vi kan finna dessa partiklar i en iskärna och på så sätt har forskare kunnat få tag på information som behövs för att kunna studera jordens magnetfält. Med informationen har forskare tagit reda på att jordens magnetfält har förändrats genom tiden. En av dessa förändringar är polomkastningar, där magnetfältets nordpol och sydpol byter plats. Om vi inte studerar dessa förändringar skulle det innebära katastrof för mänskligheten. Other/Unknown Material Antarc* Antarctica Greenland Nordpol* Lund University Publications Student Papers (LUP-SP) Greenland |
institution |
Open Polar |
collection |
Lund University Publications Student Papers (LUP-SP) |
op_collection_id |
ftulundlupsp |
language |
English |
topic |
Cosmic rays · Cosmogenic Radionuclides · Paleomagnetism · Laschamps excursion · 10Be Earth and Environmental Sciences |
spellingShingle |
Cosmic rays · Cosmogenic Radionuclides · Paleomagnetism · Laschamps excursion · 10Be Earth and Environmental Sciences Rydh, Alexander Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion |
topic_facet |
Cosmic rays · Cosmogenic Radionuclides · Paleomagnetism · Laschamps excursion · 10Be Earth and Environmental Sciences |
description |
Extreme geomagnetic variations such as excursions where the magnetic poles shift, and return are not fully understood. 10Be, used as a proxy for the magnetic field studies has been proposed as a compliment to paleomagnetic models, allowing adjustments. LSMOD.2 is a sediment and volcanic based magnetic model encompassing the Laschamps excursion ~41 000 years ago. LSMOD.2 is limited due to lacking data from the high latitudes and the southern hemisphere, creating uncertainties in the model. To investigate the usefulness of 10Be data, corrections must be made for climate variability, affecting the transport and deposition of 10Be, as well as filtering for solar activity, occurring as millennial and centennial variations. In this study, 10Be flux data shows good agreement with LSMOD.2 between 40.5 to 41.2 ka. After 41.2 ka the Greenland and Antarctica data diverge in 10Be production rates with LSMOD.2. Comparing 10Be data with other magnetic field reconstructions shows that LSMOD.2 has the best agreement over a period ca. 700 years. However, while LSMOD.2 does show the best agreement with 10Be data, none of the investigated magnetic field models show an overall good agreement with 10Be data or each other, thus 10Be data is limited to uses for local models e.g. northern hemisphere. Har du någonsin hört talas om en supernova? En exploderande stjärna som kastar ut högenergetiska partiklar. Inte nog med det så färdas även dessa partiklar genom hela galaxen. Galaxer är stora och endast några ut av partiklarna når vår jord. Vi kan finna dessa partiklar i en iskärna och på så sätt har forskare kunnat få tag på information som behövs för att kunna studera jordens magnetfält. Med informationen har forskare tagit reda på att jordens magnetfält har förändrats genom tiden. En av dessa förändringar är polomkastningar, där magnetfältets nordpol och sydpol byter plats. Om vi inte studerar dessa förändringar skulle det innebära katastrof för mänskligheten. |
format |
Other/Unknown Material |
author |
Rydh, Alexander |
author_facet |
Rydh, Alexander |
author_sort |
Rydh, Alexander |
title |
Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion |
title_short |
Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion |
title_full |
Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion |
title_fullStr |
Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion |
title_full_unstemmed |
Unraveling Magnetic Anomalies: A study of Earth´s Field Asymmetries during the Laschamps Excursion |
title_sort |
unraveling magnetic anomalies: a study of earth´s field asymmetries during the laschamps excursion |
publisher |
Lunds universitet/Geologiska institutionen |
publishDate |
2024 |
url |
http://lup.lub.lu.se/student-papers/record/9163247 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland Nordpol* |
genre_facet |
Antarc* Antarctica Greenland Nordpol* |
op_relation |
http://lup.lub.lu.se/student-papers/record/9163247 |
_version_ |
1809826311629176832 |