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Medan magnetik bumi memantulkan sebagian besar angin matahari, yaitu arus partikel bermuatan dari matahari yang mampu mengionisasi lapisan atmosfer bumi.<ref>{{cite journal |title=Solar wind hammers the ozone layer |first=Quirin |last=Shlermeler |date=3 March 2005 |doi=10.1038/news050228-12 |journal=News@nature |url=http://www.nature.com/news/2005/050228/full/news050228-12.html}}</ref> Gas-gas yang terkena angin matahari dapat terperangkap dalam gelembung medan magnet yang dapat terbawa arus angin matahari, sebuah proses yang mungkin pernah terjadi di [[planet Mars]].<ref>{{cite news |title=Solar wind ripping chunks off Mars |url=http://www.cosmosmagazine.com/news/2369/solar-wind-ripping-chunks-mars |work=Cosmos Online |date=25 November 2008 |accessdate=21 October 2013}}</ref><ref>{{harvnb|Luhmann|Johnson|Zhang|1992}}</ref><ref>[http://scign.jpl.nasa.gov/learn/plate1.htm Structure of the Earth]. Scign.jpl.nasa.gov. Diakses 2012-01-27.</ref>
 
Studi mengenai medan magnetik bumi pada masa lalu disebut dengan [[Paleomagnetisme]].<ref name="McElhinny2000">{{cite book |last1=McElhinny |first1=Michael W. |last2=McFadden |first2=Phillip L. |title=Paleomagnetism: Continents and Oceans |publisher=Academic Press |year=2000 |isbn=0-12-483355-1 |ref=harv}}</ref> Polaritas dari medan magnetik bumi terekam dalam bebatuan, dan pembalikan medan magnetik bumi terkema di dalam garis-garis yang terbentuk ketika pembentukan bebatuan terjadi. Paleomagnetisme juga dapat menjadi sarana perekaman [[geokronologi]] batuan dan sedimen.<ref>{{cite book |last1=Opdyke |first1=Neil D. |last2=Channell |first2=James E. T. |title=Magnetic Stratigraphy |publisher=Academic Press |year=1996 |isbn=978-0-12-527470-8 |ref=harv}}</ref> Medan mangetik bumi juga menyebabkan bebatuan yang mengandung [[bijih tambang]] dari unsur ferromagnetik lebih mudah dicari karena menyebabkan [[anomali magnetik]] bumi.<ref>{{cite book |last1=Mussett |first1=Alan E. |last2=Khan |first2=M. Aftab |title=Looking into the Earth: An introduction to Geological Geophysics |year=2000 |publisher=Cambridge University Press |isbn=0-521-78085-3 |ref=harv}}</ref>
 
Manusia telah menggunakan [[kompas]] yang bergantung pada medan magnetik bumi untuk menentukan arah, sejak abad ke 11 masehi.<ref>{{cite book |last=Temple |first=Robert |title=The Genius of China |publisher=Andre Deutsch |year=2006 |isbn=0-671-62028-2 |ref=harv}}</ref> Hewan juga diketahui memanfaatkan medan magnetik bumi sebagai sarana untuk bermigrasi.<ref>http://www.antaranews.com/berita/417786/ikan-salem-punya-sistem-gps-untuk-bermigrasi</ref> Variasi medan magnetik bumi diketahui berhubungan dengan variasi curah hujan di negara tropis.<ref>{{cite news |url=http://planetearth.nerc.ac.uk/news/story.aspx?id=296 |title=Link found between tropical rainfall and Earth's magnetic field |work=Planet Earth Online |date=20 January 2009 |publisher=National Environment Research Council |accessdate=19 April 2012}}</ref>
 
== Referensi ==
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* {{cite book|first1=Neil F. |last1=Comins |year=2008 |title=Discovering the Essential Universe |publisher=[[W. H. Freeman]] |edition=Fourth |isbn=978-1-4292-1797-2|ref=harv}}
* {{cite journal |doi=10.1073/pnas.93.2.646 |last1=Herndon |first1=J. M. |title=Substructure of the inner core of the Earth |journal=[[PNAS]] |volume=93 |issue=2 |pages=646–648 |date=1996-01-23 |pmid=11607625 |pmc=40105|bibcode = 1996PNAS...93..646H |ref=harv }}
* {{cite journal |last1=Hollenbach |first1=D. F. |title=Deep-Earth reactor: Nuclear fission, helium, and the geomagnetic field |journal=[[PNAS]] |volume=98 |issue=20 |date=2001-09-25 |doi=10.1073/pnas.201393998 |pmid=11562483 |pmc=58687|bibcode = 2001PNAS...9811085H |last2=Herndon |first2=J. M. |pages=11085–90 |ref=harv }}
* {{cite journal |first1=Jeffrey J. |last1=Love |title=Magnetic monitoring of Earth and space |url=http://geomag.usgs.gov/downloads/publications/pt_love0208.pdf |journal=[[Physics Today]] |volume=61 |issue=2 |pages=31–37 |year=2008 |doi=10.1063/1.2883907|bibcode = 2008PhT....61b..31H |ref=harv}}
* {{cite journal |last1=Luhmann |first1=J. G. |last2=Johnson |first2=R. E. |last3=Zhang |first3=M. H. G. |title=Evolutionary impact of sputtering of the Martian atmosphere by O<sup>+</sup> pickup ions |journal=[[Geophysical Research Letters]] |volume=19 | issue=21 |pages=2151–2154 |year=1992|ref=harv|bibcode = 1992GeoRL..19.2151L |doi = 10.1029/92GL02485 }}
* {{cite book|first=Ronald T. |last=Merrill |year=2010 |title=Our Magnetic Earth: The Science of Geomagnetism|publisher=[[University of Chicago Press]]|isbn=0-226-52050-1|ref=harv}}
* {{cite book|last=Merrill|first= Ronald T.|last2=McElhinny|first2=Michael W.|last3=McFadden|first3=Phillip L.|title=The magnetic field of the earth: paleomagnetism, the core, and the deep mantle|publisher=[[Academic Press]]|year=1996|isbn=978-0-12-491246-5|ref=harv}}
* {{cite web |url=http://www.newton.dep.anl.gov/askasci/gen99/gen99256.htm |title=Temperature of the Earth's core |work=NEWTON Ask a Scientist |year=1999 |accessdate=September 2011|ref=harv}}
* {{cite book |last=Tauxe |first=Lisa |title=Paleomagnetic Principles and Practice |publisher=[[Kluwer]] |year=1998 |isbn=0-7923-5258-0 |ref=harv}}
* {{cite journal |first1=J. N. |last1=Towle |title=The Anomalous Geomagnetic Variation Field and Geoelectric Structure Associated with the Mesa Butte Fault System, Arizona |journal=Geological Society of America Bulletin |volume=9 |pages=221–225 |year=1984 |doi=10.1130/0016-7606(1984)95<221:TAGVFA>2.0.CO;2|ref=harv |issue=2|bibcode = 1984GSAB...95..221T }}
* {{cite journal |first1=James R. |last1=Wait |author1-link=James R. Wait |year=1954 |title=On the relation between telluric currents and the earth's magnetic field |journal=Geophysics |volume=19 |pages=281–289 |doi=10.1190/1.1437994|bibcode = 1954Geop...19..281W |ref=harv |issue=2}}
* {{cite book |first1=Martin |last1=Walt |author1-link=Martin Walt |year=1994 |title=Introduction to Geomagnetically Trapped Radiation |publisher=[[Cambridge University Press]] |isbn=978-0-521-61611-9|ref=harv}}
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