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Monday, July 27, 2020 | History

2 edition of Auroral electrojet indices (AE) for July-December 1978 found in the catalog.

Auroral electrojet indices (AE) for July-December 1978

T. Kamei

Auroral electrojet indices (AE) for July-December 1978

by T. Kamei

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Published by Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University in [Kyoto, Japan] .
Written in English

    Subjects:
  • Auroral electrojet -- Charts, diagrams, etc.

  • Edition Notes

    Sequel to Auroral electrojet indices (AE) for January-June 1978 by T. Kamei and H. Maeda.

    StatementT. Kamei and H. Maeda.
    SeriesData book / World Data Center C2 for Geomagnetism ;, no. 4, Data book (World Data Center C2 for Geomagnetism) ;, no. 4.
    ContributionsMaeda, Hiroshi, 1919-
    Classifications
    LC ClassificationsQC969 .K36 1981
    The Physical Object
    Pagination108 p. :
    Number of Pages108
    ID Numbers
    Open LibraryOL2900935M
    LC Control Number84129046

    Local time versions of electrojet indices. SMES S, SMUS S, SMLS S, SMED D, SMUD D, SMLD D Sunlight and darkness electrojet indices. SMR Symmetric ring current index. SMR-LT Partial ring current indices, SMR, SMR, SMR, SMR Ring current indices . Auroral Electrojet (AE) index is for example one such indices. AE index measures the magnetic activity in the auroral zone due to the current in the ionosphere around the auroral region [2]. The current in the auroral zone is changed with the incoming solar wind. Therefore.

      The auroral electrojet is enhanced in the polar ionosphere associated with charged particle precipitation and field-aligned currents during substorms. In this paper the geometry of the elctrojet is determined by using the ionospheric equivalent current systems for every 5 minutes during March 18 The latitudinal and local time shifts of the oval are examined. Genre/Form: Electronic government publications Charts, diagrams, etc: Additional Physical Format: Print version: Allen, J.H. (Joe Haskell). Auroral electrojet magnetic activity indices AE (10) for

    From a study of the 21 largest geomagnetic storms during solar cy a strong correlation is established between the ring current index Dst and the time-weighted accumulation of the 1-hour auroral electrojet indices, AE and AL. The time-weighted accumulation corresponds to convolution of the auroral electrojet indices with an exponential weighting function with an e-folding time of hours. The upper and lower envelopes of this superposition define the AU (amplitude upper) and the AL (amplitude lower) indices, respectively. The difference between the two envelopes determines the AE (Auroral Electrojet) index, i.e., AE = AU - AL. AO is defined as the average value of AU and AL.


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Auroral electrojet indices (AE) for July-December 1978 by T. Kamei Download PDF EPUB FB2

The auroral electrojets are represented by the AL and AU indices. We show the AL, AU, and AE indices on 20 April in the top two panels of Figure 3. The CANOPUS local electrojet indices CU and CL are shown in the bottom panel.

Auroral Electrojet Index (AE) The Auroral Electrojet Index, AE, is designed to provide a global, quantitative measure of auroral zone magnetic activity produced by enhanced Ionospheric currents flowing below and within the auroral oval. Ideally, It is the total range of deviation at an instant of time from quiet day values of the horizontal magnetic field (h) around the auroral oval.

1 Introduction. The auroral electrojet index (AE) developed by Davis and Sugiura [] is well correlated with the strength of the auroral electrojet currents in the Northern Hemisphere ionosphere and is traditionally employed as an indicator of the magnitude of global geomagnetic AE index is defined as the difference between the auroral electrojet upper (AU) and lower (AL) by: 5.

Gjerloev et al.: Substorm behavior of the auroral electrojet indices provided by the World Data Center C2 for Geomagnetism Data Books of the auroral electrojet Auroral electrojet indices book (AE). Although this was done as carefully as possible, we estimate that the determining station is.

Auroral Electrojet (AE, AL, AO, AU) - A Global Measure of Auroral Zone Magnetic Activity Metadata Updated: October 6, The AE index is derived from geomagnetic variations in the horizontal component observed at selected () observatories along the auroral Publish Year: An electrojet is an electric current which travels around the E region of the Earth's are two electrojets: above the magnetic equator (the equatorial electrojet), and near the Northern and Southern Polar Circles (the Auroral Electrojets).Electrojets are Hall currents carried primarily by electrons at altitudes from to km.

Auroral Electrojet (AE) Indices. for January - December (Provisional) 1. Derivation and Representation. The AE index is derived from geomagnetic variations in the horizontal component observed at selected () observatories along the auroral zone in the northern hemisphere.

Monthly files containing min. resolution AE indices [ - ] On AE index [description in the Data Book No 25, "Auroral electrojet indices (Provisional AE) ", ]. Gjerloev et al.: Response of the auroral electrojet indices to abrupt southward IMF turnings auroral electrojet” (p.

Vasyliunas (), however, challenged this by showing that a current will flow in the auroral zone assuming enhanced ionospheric conductivity in this region. Since the McPherron () study it has been. Auroral electrojets are horizontal electric currents that flow in the ionosphere of the auroral zone; their indices were introduced by Davis and Sugiura as a measure of global electrojet activity.

These indices are derived from geomagnetic variations in the horizontal component observed at 12 observatories in a geomagnetic latitude range of   Using hourly mean auroral electrojet indices for the past 20 years, we examine the seasonal and solar cycle variations of the AU and AL indices as well as the smaller time-scale fluctuations in these indices.

The AU and AL indices maximize during summer and equinoctial months, respectively. By removing the effects of the solar conductance from the AU index, it is found that the. These ground magnetometers covers 58–79° geographic latitude and 5–36° geographic longitude. From IMAGE data local auroral electrojet indices (IU, IL, and IE) are calculated for monitoring the auroral oval ionospheric currents in the European sector (Kauristie et al., and references therein).

East (EEJ) and West (WEJ) auroral electrojet. Auroral electrojets indices (AU, AL, AO and AE) minute values are estimated by “Data Analysis Center for Geomagnetism and Spacemagnetism” WDC-C2, while detailed graphs and tables are available on a series of books. Get this from a library.

Auroral electrojet magnetic activity indices AE(12) for July - December [J H Allen; C C Abston; J E Salazar; John A McKinnon; World Data Center A for Solar-Terrestrial Physics,] -- The Auroral Electrojet index (AE) is discussed and a brief description is given of the derivation of station min AE indices for July-December   The auroral electrojet AL and AU indices, the smallest (AL) and largest (AU) values of geomagnetic variations in the horizontal component observed at 11 selected observatories along the auroral zone in the northern hemisphere, show nonsubstorm conditions after UT (Fig.

1D), indicating a quiet auroral oval. [5] The auroral electrojet indices AL and AU have been used extensively since they were first introduced by Davis and Sugiura []. Historically the indices have been used as an indicator of auroral electrojet activity and thereby the magnetospheric activity.

The auroral electrojet indices are scalar values, which indicate the maximum. Using the hourly mean AE indices for the past 20 years, amounting to a total ofhours, we examine how the longitudinal station gaps of the present AE network affect the ability to monitor accurately the auroral electrojets.

The latitudinal shift of the auroral electrojet location with magnetic activity also affects the reliability of the AE indices. In this paper magnetic indices were extracted from World Data Center (WDC) for geomagnetism forsix years ( to ).

The indices extracted are AuroralElectrojet (AE), Auroral Upper (AU), Auroral Lower (AL) and Auroral Oval (AO). The indices daily values measured at 24 hours Universal Time (UT) were averaged to monthly values. An aurora (plural: auroras or aurorae), sometimes referred to as polar lights, northern lights (aurora borealis), or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in the high-latitude regions (around the Arctic and Antarctic).

Auroras are the result of disturbances in the magnetosphere caused by solar wind. Historically the indices have been used as an indicator of auroral electrojet activity and thereby the magnetospheric activity. The auroral electrojet indices are scalar values, which indicate the maximum perturbation measured at one of the AE station locations.

Hence, they are local indices, and measure global electrojet activity only to the. A generalization of the traditional station auroral electrojet index, AE, to include more than magnetometer stations, SME, is an excellent predictor of global auroral power, even at high cadence (1-min).

We use this index, and a data base of more t substorms derived from it, coveringto investigate time and energy scales in the magnetosphere, during substorms and.SuperMAG auroral electrojet (SME) are introduced and examined, along with the corresponding upper and lower envelopes (SMU and SML).

Also, the east-west component,B E, is investigated. We also consider whether using any of the local indices is actually .Gjerloev et al.: Substorm behavior of the auroral electrojet indices provided by the W orld Data Center C2 for Geomagnetism Data Books o f the auroral electrojet indices (AE).