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C-73 (317) B. Popielawska, Signatures of Dual Mechanism of Plasma Sheet Formation and Structuring: A Study Based on Prognoz-8 Plasma Data

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Summary, 5

Abbreviations, 7

1. Introduction, 9

1.1 The Earth┬┤s magnetosphere, 10

1.2 Empirical models of magnetic and electric field in the magnetosphere, 15

1.3 The problem of magnetospheric mapping, 31

1.4 Precipitation regions and their counterpart in the magnetosphere, 34

1.5 Objectives of the paper, 40

2. Description of the experiment, 42

2.1 Instrumentation, 42

3. A review of PROMICS-2 data during Prognoz-8 magnetotail crossings, 45

3.1 July 19, 1981 (day 200/81, DTP 168). Plasma populations at the magnetotail flank and their response to IMF changes, 45

3.2 July 23, 1981 (day 204/81, DTP 171). Solar-wind driven magnetic activity, 56

3.3 July 30/31, 1981 (DTP 176/177, day 212/213/81). Plasma at the tail flank during dominating negative IMF BY and a weak solar wind forcing (BZ0), 68

3.4 July 23 and 27, 1981 (204/81, DTP 171 and 208/81, DTP 174). Strong substorms, 72

3.5 Aug. 3/4, 1981 (DTP 177/180, day 216/217/81). Soft plasma "loaden" flux tubes above the plasma sheet during the growth phase of a substorm?, 83

3.6 Aug. 19/20, 1981 (DTP 187/188, day 231/232/81). Plasma sheet under dominating northward IMF BZ, 89

3.7 Aug. 22/23/24, 1981 (DTP 190 - 234/235/236/81). Strong substorm and effects of severly distorted two-cell convection in the plasma sheet, 96

3.8 Aug. 26/27/28/1981 (DTP 194 - 234/235/236/81). Warm plasma "loaden" magnetic flux tubes above the plasma sheet, 101

3.9 Aug. 31 / Sept. 01, 1981 (DTP 196 - 243/244/81). Quiet-time plasma sheet, 110

3.10 Sept. 4/5, 1981 (DTP 199/202 - 247/248/81). Plasma sheet in the midnight sector during prolonged active period (IMF BZ < -5 nT), 118

3.11 Sept. 16/17, 1981 (DTP 211 - DOY 259/260/81). Plasma sheet in the midnight sector during moderate magnetic activity (-5 nT < IMF BZ < 0), 122

3.12 Sept. 19/20/21, 1981 (DTP 213 - 262/263/264/81). Stagnant MS-like plasma in the lobe during northward IMF BZ, 126

4. Discussion, 137

4.1 Plasma sheet under IMF with a dominating northward BZ-component, 137

4.2 Strongly forced system - near-Earth plasma sheet structure and dynamics, 142

4.3 Plasma in the tail under IMF with a dominating strong BY-component, 147

4.4 Plasma sheet under weak to moderate solar wind forcing, 151

4.5 WE, SEZ and Lennartsson┬┤s scenario for LLBL plasma penetration into the tail, 155

4.6 Miscellanea - magnetopause boundary layers, stagnant plasma in the lobe, 158

5. Summary and suggestions for future studies, 161

Acknowledgments, 164

References, 165

Appendix: Colour coding for plasma spectrograms, 182


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