Polar Cap Index

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Polar Cap Index

Online_Linkage:http://spidr.ngdc.noaa.gov

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Polar Cap Index : The PC index is an index to monitor the polar cap magnetic activity which is mainly caused by changes in the IMF southward component (BZ) and solar wind velocity. Numerous investigations have shwon that the IMF southward component drives ionospheric convection over the polar caps, which is sensed by ground magnetometers responding to the two-cell system of currents flowing in the ionosphere. As the Earth rotates under this two-cell current system, a near-pole station is always located under the sun-aligned part of the system (i.e. a transpolar current). This allows derivation of an index from data obtained at a single near-pole station simply calculating a magnetic horizontal component disturbance along the dawn-dusk meridian. Based on an availability of geomagnetic data from near-pole stations Thule (Greenland, 86.5° geomagnetic latitude) and Vostok (Antarctica, -83.4° ), the new magnetic activity index PC was introduced and studied by Troshichev and Andrezen [Planet. Space Sci., 33, 415, 1985], and Troshichev et al. [Planet. Space Sci., 36, 1095, 1988].

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Metadata_Date:20070101

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Contact_Organization:DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

Contact_Person:Eric A. Kihn

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Address_Type:Mailing and Physical Address

City:Boulder

State_or_Province:CO

Country:USA

Contact_Voice_Telephone:(303) 497-6349

Contact_Electronic_Mail_Address:EricA.Kihn@noaa.gov

Metadata_Standard_Name:Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version:FGDC-STD-001-1998