Dependence of latitudes of high-latitude, forenoon, westward moving, isolated magnetic impulse events centres on season and Kp

• Autorzy: Kraiński, W.
• Języki publikacji: EN

Abstrakty

EN

Data from meridional magnetometer chain of six northernmost stations of IMAGE magnetometer array are used to determine the dependence of magnetic latitudes of a subclass of magnetic impulse events (MIE) centres on season and magnetic activity. The events centres are defined, and their motion directions (east-or westward) are determined, using elements of covariance matrices of magnetic variations recorded on all magnetometers. The latitudes of centres of high-latitude, forenoon, westward moving, isolated MIEs are found to be contained in the range of latitudes of dayside area of central plasma sheet (CPS) and of boundary plasma sheet (BPS) and to decrease with increasing magnetic activity. In summer and for Kp = 0, these latitudes are the highest and their decreasing rate with increasing Kp is minimal, while in winter they are the lowest and the rate is maximal. For all seasons, this decreasing rate is less than the decreasing rate of the cusp latitude. In summer (on "summer-side" of the magnetosphere in solstices seasons), the loci of appearing MIEs are deep, well below the magnetopause layer for the activity interval 0 =< Kp =< 5. On the "winter-side" of the magnetosphere, MIEs can emerge near the magnetopause. Same relations are proposed for CPS' and BPS' dayside areas.

Słowa kluczowe

EN

magnetic impulse events; magnetic pulsations; magnetosphere

• Czasopismo: Acta Geophysica Polonica
• Rocznik: 2000
• Tom: Vol. 48, nr 4
• Strony: 479-488
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Kraiński, W.

• Space Research Centre, Polish Academy of Sciences, Warszawa, Poland,