Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Standard

Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices. / Tomita, S; Nose´, M; Iyemori, T; Toh, H; Takeda, M; Matzka, Jürgen; Bjornsson, G; Saemundsson, T; Janzhura, A; Troshichev, O; Schwarz, G.

In: Annales Geophysicae, Vol. 29, No. 4, 2010, p. 673-678.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Harvard

Tomita, S, Nose´, M, Iyemori, T, Toh, H, Takeda, M, Matzka, J, Bjornsson, G, Saemundsson, T, Janzhura, A, Troshichev, O & Schwarz, G 2010, 'Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices' Annales Geophysicae, vol 29, no. 4, pp. 673-678., 10.5194/angeo-29-673-2011

APA

Tomita, S., Nose´, M., Iyemori, T., Toh, H., Takeda, M., Matzka, J., ... Schwarz, G. (2010). Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices. Annales Geophysicae, 29(4), 673-678. 10.5194/angeo-29-673-2011

CBE

Tomita S, Nose´ M, Iyemori T, Toh H, Takeda M, Matzka J, Bjornsson G, Saemundsson T, Janzhura A, Troshichev O, Schwarz G. 2010. Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices. Annales Geophysicae. 29(4):673-678. Available from: 10.5194/angeo-29-673-2011

MLA

Vancouver

Author

Tomita, S; Nose´, M; Iyemori, T; Toh, H; Takeda, M; Matzka, Jürgen; Bjornsson, G; Saemundsson, T; Janzhura, A; Troshichev, O; Schwarz, G / Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices.

In: Annales Geophysicae, Vol. 29, No. 4, 2010, p. 673-678.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Bibtex

@article{4210b6b5b9734c4084d957c64932c0cf,
title = "Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices",
keywords = "Storms and substorms, Magnetospheric physics, Auroral phenomena",
publisher = "Copernicus GmbH",
author = "S Tomita and M Nose´ and T Iyemori and H Toh and M Takeda and Jürgen Matzka and G Bjornsson and T Saemundsson and A Janzhura and O Troshichev and G Schwarz",
year = "2010",
doi = "10.5194/angeo-29-673-2011",
volume = "29",
number = "4",
pages = "673--678",
journal = "Annales Geophysicae",
issn = "0992-7689",

}

RIS

TY - JOUR

T1 - Magnetic local time dependence of geomagnetic disturbances contributing to the AU and AL indices

A1 - Tomita,S

A1 - Nose´,M

A1 - Iyemori,T

A1 - Toh,H

A1 - Takeda,M

A1 - Matzka,Jürgen

A1 - Bjornsson,G

A1 - Saemundsson,T

A1 - Janzhura,A

A1 - Troshichev,O

A1 - Schwarz,G

AU - Tomita,S

AU - Nose´,M

AU - Iyemori,T

AU - Toh,H

AU - Takeda,M

AU - Matzka,Jürgen

AU - Bjornsson,G

AU - Saemundsson,T

AU - Janzhura,A

AU - Troshichev,O

AU - Schwarz,G

PB - Copernicus GmbH

PY - 2010

Y1 - 2010

N2 - The Auroral Electrojet (AE) indices, which are composed of four indices (AU, AL, AE, and AO), are calculated from the geomagnetic field data obtained at 12 geomagnetic observatories that are located in geomagnetic latitude (GMLAT) of 61.7°-70°. The indices have been widely used to study magnetic activity in the auroral zone. In the present study, we examine magnetic local time (MLT) dependence of geomagnetic field variations contributing to the AU and AL indices. We use 1-min geomagnetic field data obtained in 2003. It is found that both AU and AL indices have two ranges of MLT (AU: 15:00-22:00MLT, ~06:00 MLT; and AL: ~02:00 MLT, 09:00-12:00 MLT) contributing to the index during quiet periods and one MLT range (AU: 15:00-20:00MLT, and AL: 00:00-06:00 MLT) during disturbed periods. These results are interpreted in terms of various ionospheric current systems, such as, Sqp, Sq, and DP2.

AB - The Auroral Electrojet (AE) indices, which are composed of four indices (AU, AL, AE, and AO), are calculated from the geomagnetic field data obtained at 12 geomagnetic observatories that are located in geomagnetic latitude (GMLAT) of 61.7°-70°. The indices have been widely used to study magnetic activity in the auroral zone. In the present study, we examine magnetic local time (MLT) dependence of geomagnetic field variations contributing to the AU and AL indices. We use 1-min geomagnetic field data obtained in 2003. It is found that both AU and AL indices have two ranges of MLT (AU: 15:00-22:00MLT, ~06:00 MLT; and AL: ~02:00 MLT, 09:00-12:00 MLT) contributing to the index during quiet periods and one MLT range (AU: 15:00-20:00MLT, and AL: 00:00-06:00 MLT) during disturbed periods. These results are interpreted in terms of various ionospheric current systems, such as, Sqp, Sq, and DP2.

KW - Storms and substorms

KW - Magnetospheric physics

KW - Auroral phenomena

U2 - 10.5194/angeo-29-673-2011

DO - 10.5194/angeo-29-673-2011

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 4

VL - 29

SP - 673

EP - 678

ER -