Tangential discontinuities in the solar wind

Burlaga, L. F.; Ness, N. F.

doi:10.1007/bf02391672

Cited by 123 publications

(89 citation statements)

References 13 publications

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“…Burlaga and Ness (1969) have shown that the actual surface orientations determined from the delay times and the measured solar wind speeds, are in very good agreement with the theoretical orientations shown in Figure 22. They also showed that (5.15) is satisfied for these discontinuities.…”

Section: L_~~~)supporting

confidence: 73%

“…Computing the orientation of the discontinuity surface from (5.15) and using the measured solar wind speed 400 km/sec, Burlaga and Ness (1969) computed that the discontinuity should have arrived at IMP 3 57.5 min after it was seen at Pioneer 6. The observed transit time was 53 rain.…”

Section: L_~~~)mentioning

confidence: 99%

“…B was parallel to the surface and that the surface was convected with the solar wind speed, as required for a tangential discontinuity. Burlaga and Ness (1969) used simultaneous magnetic field measurements from 3 spacecraft (Explorers 33, 34, and 35) to identify 6 directional discontinuities whose orientations determined from measured time delays and solar wind speeds, are consistent with those computed from (5.15). These results are shown in Figure 22.…”

Section: L_~~~)mentioning

confidence: 99%

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Hydromagnetic waves and discontinuities in the solar wind

Burlaga

1971

Space Sci Rev

157

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Section: L_~~~)supporting

confidence: 73%

Section: L_~~~)mentioning

confidence: 99%

Section: L_~~~)mentioning

confidence: 99%

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Hydromagnetic waves and discontinuities in the solar wind

Burlaga

1971

Space Sci Rev

157

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“…Lepping To estimate its normal using relative timings between spacecraft, it is necessary to measure a discontinuity at at least three locations. Burlaga and Ness [1969] Burlaga and Ness [1969] showed that most of the TDs were slightly curved on the spacecraft separation scale.…”

Section: Introductionmentioning

confidence: 99%

Three spacecraft observations of solar wind discontinuities

Horbury

Burgess

Fränz

et al. 2001

Geophysical Research Letters

117

143

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Abstract.Observations of solar wind magnetic field discontinuities using 3 spacecraft allow their orientations to be estimated. During 5 days when Geotail, Wind and IMP 8 were between 6 x 104 and 4 x 105 km apart, 35 events identified using the Tsurutani-Smith method were detected in all 3 magnetic field data sets. Normals estimated from interspacecraft timings showed that very few were unambiguous rotational discontinuities, with 77% likely to be tangential, with < 20% of the magnetic field at the discontinuity threading the normal plane. However, previous single spacecraft studies using minimum variance suggest that most discontinuities are rotational. Minimum variance analysis resulted in many normal estimates lying far from the timing-derived normals. While some of this discrepancy is likely to be due to random errors in minimum variance vectors, there appears to be a class of events with small field magnitude changes where the minimum variance directions and discontinuity normals are approximately perpendicular, probably due to surface waves on the discontinuities.

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“…propagates at a constant speed (Ogilvie and Burlaga, 1969;Chao, 1970), and similarly for tangential discontinuities on the order of 0.002 AU i -6 - (Burlaga and Ness, 1969). In all of the com p utations done for this study involving more than one S/C, we have assumed in fact that the discontinuities can be approximp ted as planar and propagate at a constant speed within the distance of the S/C separations (< 0.004 AU).…”

mentioning

confidence: 99%

A correlative study of ssc's, interplanetary shocks, and solar activity

Chao¹,

Lepping

1974

J. Geophys. Res.

135

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We have examined 93 ssc's during the 4‐year period from 1968 to 1971 at and near the peak of the solar activity cycle. Of the 93 ssc's, 81 could be associated with solar activity such as solar flares and type 2 and type 4 radio bursts. The mean propagation speeds of these flare‐associated events ranged from 400 to 1000 km/s, the average speed being 600–700 km/s. Disturbances associated with 48 of the ssc's have been studied in detail by using the corresponding interplanetary (IP) magnetic field and plasma data when they were available. We found that 41 of the 48 disturbances corresponded to IP shock waves, and the remaining 7 events were tangential discontinuities. Thirty percent of the IP shocks had thick structure (i.e., the magnetic field jump across the shock occurred over a distance much greater than 50 proton Larmor radii). Also given is a statistical study of the gross geometry of a ‘typical’ or average shock surface based on multiple spacecraft sightings and their relative orientation with respect to the solar flare and/or solar activity. By considering the orientations of 22 well‐determined shock normals in relation to the positions of the parent flares on the solar disk, a method that is a modification of one given by Taylor (1969), it is suggested that a typical shock front propagating out from the sun at 1 AU has a radius of curvature of the order of 1 AU. Also given are some general properties of oblique IP. flare shocks.

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Tangential discontinuities in the solar wind

Cited by 123 publications

References 13 publications

Hydromagnetic waves and discontinuities in the solar wind

Hydromagnetic waves and discontinuities in the solar wind

Three spacecraft observations of solar wind discontinuities

A correlative study of ssc's, interplanetary shocks, and solar activity

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