Inward motion of the magnetopause before a substorm

Aubry, M. P.; Russell, C. T.; Kivelson, M. G.

doi:10.1029/ja075i034p07018

Cited by 316 publications

(164 citation statements)

References 38 publications

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“…A subsequent statistical study by Fairfield (1971) showed that the more earthward magnetopause positions are associated with southward interplanetary magnetic fields. The only direct observation of the actual inward motion, on March 27, 1968, was described by Aubry et al (1970). In this single event, which has been discussed extensively in the literature (e.g., Russell and McPherron, 1973b; OGO-5 crossed the magnetopause repeatedly in its inbound orbit.…”

Section: Dayside Flux Erosion and Expansion Of The Polar Capmentioning

confidence: 99%

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Observations of interactions between interplanetary and geomagnetic fields

Burch¹

1974

Reviews of Geophysics

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Magnetospheric effects associated with variations of the north‐south component of the interplanetary magnetic field (IMF) are examined in light of recent experimental and theoretical results. Although the occurrence of magnetospheric substorms is statistically related to periods of southward IMF, the details of the interaction are not understood. In particular, attempts to separate effects resulting directly from the interaction between interplanetary and geomagnetic fields from those associated with substorms have produced conflicting results. One can, however, say with some assurance that the transfer of magnetic flux from the day side to the night side magnetosphere, as evidenced by equatorward motion of the polar cusp and increases of the magnetic energy density in the lobes of the geomagnetic tail, is a direct consequence of the southward IMF. On the other hand, the formation of a macroscopic X‐type neutral line at tail distances less than 35 RE appears to be a substorm phenomenon. Although other plasma and field phenomena in the outer magnetosphere and at low altitudes may be directly associated with the southward IMF, the evidence is less convincing. The quantitative results that have been obtained are compared with current theoretical models of the reconnection process.

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Section: Dayside Flux Erosion and Expansion Of The Polar Capmentioning

confidence: 99%

“…Any process that increases the total magnetic flux in the tail lobes necessarily results in erosion of magnetic flux from the dayside as defined by Aubry et al (1970).…”

Section: Dayside Flux Erosion and Expansion Of The Polar Capmentioning

confidence: 99%

Observations of interactions between interplanetary and geomagnetic fields

Burch¹

1974

Reviews of Geophysics

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“…The problem of substorm triggering is of key importance for substorm physics. Initially, it was thought that a northward turning of the interplanetary magnetic field (IMF) B Z component was the required or main trigger (Aubry et al, 1970;Lyons, 1995). Later it was reported (Hsu and McPherron, 2004) that "non-triggered substorms", which can be associated with a steady southward IMF B Z or northward IMF ("non-triggered substorms with positive IMF B Z "), have the same features, such as a negative bay in an auroral low (AL) index and Pi2 waveforms associated with onset, as "normal substorms".…”

Section: Introductionmentioning

confidence: 99%

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

et al. 2017

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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.

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“…-with thaBOUthward,turning of the 1 interplanetary magnetic-if .eld £ " (see Nishida,,1978]..Indeed, once the dayside magnetosphei a i» ; v,f '^eroded, by-magnetic reconnection. [Aubry et al, 1970], the eolar wind f,?. plasma invades the magnetosphere.…”

Section: Introdccticmjmentioning

confidence: 99%