Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar capстатья
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Дата последнего поиска статьи во внешних источниках: 19 марта 2019 г.
Аннотация:Abstract. A study is undertaken into parameters of the polar
auroral and geomagnetic pulsations in the frequency range 1–
4 mHz (Pc5=Pi3) during quiet geomagnetic intervals preceding
auroral substorms and non-substorm background variations.
Special attention is paid to substorms that occur under
parameters of the interplanetary magnetic field (IMF)
conditions typical for undisturbed days (“non-triggered substorms”).
The spectral parameters of pulsations observed in
auroral luminosity as measured by a meridian scanning photometer
(Svalbard) in the polar cap and near the polar boundary
of the auroral oval are studied and compared with those
for the geomagnetic pulsations measured by the magnetometer
network IMAGE in the same frequency range. It is found
that Pc5=Pi3 power spectral density (PSD) is higher during
pre-substorm time intervals than for non-substorm days and
that specific variations of pulsation parameters (”substorm
precursors”) occur during the last 2–4 pre-substorm hours.