Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Speaker Deck
PRO
Sign in
Sign up
for free
複数のX-lineを形成する磁気リコネクションでの電子加速 / Elecron Acceleration during Magnetic Reconnection with multiple X-lines
Tsubasa Yumura
February 05, 2008
Science
0
120
複数のX-lineを形成する磁気リコネクションでの電子加速 / Elecron Acceleration during Magnetic Reconnection with multiple X-lines
2008年度 修士論文発表会の発表資料
修士論文→
https://drive.google.com/open?id=0Bzb0bpXeRHYRWUptUEt3Ni11blk
Tsubasa Yumura
February 05, 2008
Tweet
Share
More Decks by Tsubasa Yumura
See All by Tsubasa Yumura
yumu19
0
16
yumu19
0
34
yumu19
1
2.4k
yumu19
0
68
yumu19
0
610
yumu19
0
97
yumu19
2
200
yumu19
1
140
yumu19
14
15k
Other Decks in Science
See All in Science
nkimoto
0
120
qiringji
13
6.3k
mllewis
0
190
agritof80
0
260
shuntaros
0
150
kanaugust
PRO
0
140
lcolladotor
0
750
utaka233
0
270
imagire
1
320
shuntaros
0
170
shuntaros
0
270
shomaekawa
1
140
Featured
See All Featured
nonsquared
81
3.3k
maltzj
500
36k
trallard
13
660
bkeepers
52
4.2k
moore
125
21k
zakiwarfel
88
3.3k
jonrohan
1021
380k
ammeep
656
54k
chrislema
173
14k
brad_frost
157
6.4k
cassininazir
347
20k
paulrobertlloyd
71
3.6k
Transcript
ෳͷ X-line Λܗ͢Δ ࣓ؾϦίωΫγϣϯͰͷిࢠՃ ౦ژେֶେֶӃɹཧֶܥݚڀՊ ٿՊֶઐ߈ɹӉՊֶେߨ࠲ ౻ຊݚڀࣨɹ౬ଜɹཌྷ
࣍ 1. ং 2. γϛϡϨʔγϣϯ 3. ෳͷ X-line ͷޮՌ 4.
ύϥϝʔλઃఆґଘੑ 5. ݁ 2
࣍ 1. ং 2. γϛϡϨʔγϣϯ 3. ෳͷ X-line ͷޮՌ 4.
ύϥϝʔλઃఆґଘੑ 5. ݁ 3
࣓ؾϦίωΫγϣϯ 4 ࣓ؾϦίωΫγϣϯɿ࣓ྗઢ͕ܨ͗ΘΔʢre- connectionʣ ESA ϛΫϩεέʔϧͰൃੜ 㱺 େنߏʹൃల ฏߦͳ࣓ͱڥքిྲྀ B
࣓ B ࣓ J ిྲྀ
ӉϓϥζϚதͷ࣓ؾϦίωΫγϣϯ 5 ଠཅίϩφϧʔϓ (NASA TRACE) ͔ʹӢ (NASA Chandra, Hubble) ٿ࣓ؾݍͱ
GEOTAIL Ӵ (JAXA) • ଠཅ • ࣓ؾݍڥքɾ࣓ؾݍඌ෦ • ߴΤωϧΪʔఱମ • ӉϓϥζϚͷΤωϧΪʔ ։์ݱͱͯ͠ॏཁ
࣓ؾϦίωΫγϣϯిࢠՃ 6 • ਓӴ(GEOTAIL, Cluster )ʹΑΔٿ࣓ؾݍͷͦͷ؍ ଌ • γϛϡϨʔγϣϯʹΑΔՃϝΧχζϜղ໌ –
X-line ۙͷ meandering/Speiser ӡಈ [Speiser, 1965] – pileup ྖҬͰͷ ∇BυϦϑτ/ۂυϦϑτ [Hoshino et al., 2001 JGR] • ୯Ұͳ X-line Λ༩͑ΔγϛϡϨʔγϣϯϞσϧ͕ओྲྀ X-line pileup ྖҬ
ෳͷ X-line Λܗ͢ΔϦίωΫγϣϯ 7 Chen et al. (2007) ຊݚڀͷత ෳͷ
X-line Λܗ͢Δ࣓ؾϦίωΫ γϣϯͰͷిࢠՃϝΧχζϜΛղ໌͢Δ • ٿ࣓ؾݍඌ෦ଠཅ෩தͰ؍ଌ͞ΕΔ • X-line ؒͷด࣓ͨ͡ྗઢɿ࣓ؾౡ – ؍ଌɿ࣓ؾౡͱߴΤωϧΪʔిࢠ [Chen et al., 2007] – ࣓ؾౡ߹ମ͢Δ [Finn and Kaw, 1977] – γϛϡϨʔγϣϯɿ࣓ؾౡ߹ମͱిࢠՃ [Saito and Sakai, 2006] ࣓ؾౡ X-line
࣍ 1. ং 2. γϛϡϨʔγϣϯ 3. ෳͷ X-line ͷޮՌ 4.
ύϥϝʔλઃఆґଘੑ 5. ݁ 8
εʔύʔίϯϐϡʔλ 9 ӉՊֶݚڀຊ෦ Space Science Simulator (SSS) JAXA
ཻࢠγϛϡϨʔγϣϯ • Maxwell ํఔࣜ • ཻࢠͷӡಈํఔࣜ 10 ∇×B = cµ0
J+ E /c ∇×E = ʵ B /c m v = q(E + v×B/cγ) m = γm0 γ = (1-v2/c2)-1/2 ཻࢠҠಈ F → v → x ిՙɾిྲྀີ x → ρ, v → J Maxwell ํఔࣜ ρ, J → E , B ӡಈํఔࣜ E , B → F ɾ ɾ ɾ PIC (particle in-cell) ๏
γϛϡϨʔγϣϯઃఆ 11 ॳظ݅ɿHarris ܕిྲྀ n(z) = n0 /cosh2(z/d) + n1
Bx (z) = B0 tanh(z/d) Bx n z z 2 ࣍ݩγϛϡϨʔγϣϯ x z y Lx Lz Bx
1. ং 2. γϛϡϨʔγϣϯ 3. ෳͷ X-line ͷޮՌ 4. ύϥϝʔλઃఆґଘੑ
5. ݁ ࣍ 12
݁Ռɿ୯Ұͳ X-line Λ༩͑Δ߹ 13 ne /n0 0 1 48 24
0 0 12 -12 x /λi z /λi ిࢠີ
݁Ռɿෳͷ X-line Λ༩͑Δ߹ 14 ne /n0 0 1 48 24
0 0 12 -12 x /λi z /λi ిࢠີ
࣓ؾౡ߹ମͷൃల 15 • Lx=48 nm=8 Ͱ࣓ؾౡ 8→2 , 2→1 ͷ̎ஈ֊߹ମ
࣓ؾதੑ໘ (z=0) Ͱͷిࢠີ
࣓ؾౡ߹ମͱిࢠՃ 16 ࣓ؾதੑ໘ (z=0) Ͱͷిࢠີ ΤωϧΪʔεϖΫτϧ ΤωϧΪʔɿε=γ-1 • 1ஈ֊߹ମ (8→2)
ʹେ෯ʹΤωϧΪʔ૿Ճ • ߹ମͷ߹͍ؒ(t=30ʙ34) ΄ͱΜͲΤωϧΪʔ૿Ճͳ͠ • ిࢠՃ࣓ؾౡ߹ମʹରԠ͢Δ
ߴΤωϧΪʔిࢠͷۭؒ <#> 17 0ɹɹ ɹɹ ɹ80 counts / cell Ωi
T = 40 Ωi T = 20 Ωi T = 30 Ωi T = 10 ߴΤωϧΪʔ (ε > 1) ిࢠ • ୯Ұͳ X-line ͷ߹ɺ࣓ؾౡΛ ғΉϦϯάঢ়Λܗ • ઌߦݚڀͰಉ༷ͷߏ
ߴΤωϧΪʔిࢠͷۭؒ 18 Ωi T = 20 Ωi T =30 Ωi
T = 34 Ωi T = 38 0ɹ ɹ80 Counts / cell Ωi T = 40 Ωi T = 50 • 2 ஈ֊߹ମʹΑΓ̎ॏϦϯάঢ়Λܗ ߴΤωϧΪʔ (ε > 1) ిࢠ
ిࢠՃྖҬͷಛఆ 19 • ి͕ిࢠʹ୯Ґ࣌ؒ͋ͨΓʹ༩͑ΔΤωϧΪʔɹJeɾE • JeɾE ͕େ͖͍ྖҬʢԼਤͷ͍ྖҬʣిࢠՃྖҬ • X-line, pileup
ྖҬʹՃ࣓͑ؾౡ߹ମྖҬՃྖҬ
࣓ؾౡ߹ମྖҬͰͷՃ 20 Ωi T = 30 Ωi T = 34
Ωi T = 38 • ࣓ؾౡ߹ମྖҬͰΤωϧΪʔεϖΫτϧΛऔಘ • ࣓ؾౡ߹ମ࣌ʹΤωϧΪʔ૿Ճ
࣓ؾౡ߹ମྖҬͰͷՃ 21 Ey Vey 0.0 2 -0.09 0 5 0
-3 • X-line ͱಉ༷ͷߏ • Ey ͰՃ • ࣓ؾౡ߹ମ࣌ʹܗ͢Δ X-line ͰՃ -12 12 0 z x z y Vex Vey
Ճཻࢠ(ε>25)ͷيಓ 22 X-line ࣓ؾౡ߹ମ pileup energy - time energy -
x z- x • 30ݸͷߴΤωϧΪʔ(ε>25)ిࢠͷཻࢠيಓΛௐͨ • શͯͷిࢠ X-line ͰՃΛड͚ͨ • ଟ͘ͷిࢠ X-line ͷޙʹpileup ྖҬ and/or ࣓ؾౡ߹ ମྖҬͰՃΛड͚͍ͯͨ ΤωϧΪʔɿε=γ-1
࣍ 23 1. ং 2. γϛϡϨʔγϣϯ 3. Multiple X-line ͷޮՌ
4. ύϥϝʔλઃఆґଘੑ – ܭࢉྖҬͷେ͖͞ґଘੑ 5. ݁
ܭࢉྖҬͷେ͖͞ґଘੑ 24 ܭࢉ ܭࢉྖҬͷେ͖͞ Lx × Lz (λi) ॳظͷ࣓ؾౡα Πζ(λi)
ॳظͷ࣓ؾౡ ̍ 48 × 32 6 8 ̎ 24 × 32 6 4 ̏ 96 × 64 6 16 • n ∝ ε-α ͰϑΟοςΟϯά
ܭࢉྖҬͷେ͖͞ґଘੑ • ϦίωΫγϣϯεέʔϧͱΤωϧΪʔ૿Ճ – શମɿ͓͓Αͦઢܗ – ࣓ؾౡ߹ମྖҬɿඇઢܗ • εέʔϧ֦େ → ߹ମྖҬͷՃେɹɹɹɹ →
ඇతిࢠͷੜ૿Ճ 25 શମ ࣓ؾౡ߹ମྖҬ ̑ഒ 2ഒ 2ഒ
1. ং 2. γϛϡϨʔγϣϯ 3. Multiple X-line ͷޮՌ 4. ύϥϝʔλઃఆґଘੑ
5. ݁ ࣍ 26
݁ • ࣓ؾౡͷଟஈ֊߹ମʹΑΓߴΤωϧΪʔి ࢠଟॏϦϯάΛܗ͢Δɿ؍ଌͷد ༩ • X-line ͱ pileup ྖҬʹՃ࣓͑ؾౡ߹ମྖҬ
ిࢠΛՃ͢Δɿ৽ͨͳཻࢠՃϝΧχζ Ϝ • ߴΤωϧΪʔిࢠͷੜෳͷՃྖ ҬʹΑΔଟஈ֊Ճ͕ॏཁ • ϦίωΫγϣϯͷεέʔϧ֦େͱͱʹ࣓ 27
݁ • X-line ͰՃͰ͖ ΔΤωϧΪʔʹ ݶք͕͋Δ • ͞ΒͳΔՃ pile ྖҬ
and/or ࣓ؾ ౡ߹ମྖҬͰಘΒ ΕΔ 28
֤ిࢠՃྖҬͰͷΤωϧΪʔ૿Ճ 29 ୯Ґ࣌ؒͨΓͷΤωϧΪʔ૿Ճ ΤωϧΪʔ૿Ճͷ૯ྔ • ՃྖҬຖʹΤωϧΪʔ૿ՃΛൺֱ • pileup ྖҬ͕શମͷΤωϧΪʔ૿Ճʹ࠷د༩͢Δ •
࣓ؾౡ߹ମՃଞͷྖҬͱൺͯখ͍͞ ∫JeɾE dSɹSɿ֤ՃྖҬͷ໘ੵ ∬JeɾE dSdtɹ
ܭࢉྖҬͷେ͖͞ґଘੑ • ిྲྀ໘ੵͰن֨Խ • ϦίωΫγϣϯͷεέʔϧ͕େ͖͘ͳ ΔʹͭΕΤωϧΪʔ͕૿Ճ͢Δ 30
ܭࢉྖҬͷେ͖͞ґଘੑ • X-line , pileup ྖҬɿ̎ഒ • ࣓ؾౡ߹ମྖҬɿ̐ഒ • ࣓ؾϦίωΫγϣϯͷεέʔϧ͕֦େ
͢Δͱ࣓ؾౡ߹ମྖҬͷد༩͕૿Ճ͢ Δɹ→ɹඇతిࢠͷੜͷ૿Ճ 31 ܭࢉ̏ɹ96 × 64 ܭࢉ̍ɹ48 × 32
pileup ྖҬͰͷՃ 32 • pileup ྖҬ (|Bz| େ) Ͱڧ͍ Ey
• ∇B υϦϑτ • ۂυϦϑτ ∇B v ∝ ʵB×∇B // ʵ y v ∝ ʵR×B // ʵ y x z y B R
࣓ؾౡ߹ମ vs. SXL 33 run Mass Ratio Space(λi ) nm
GF D(λi ) perturbation 1 100 48 × 32 8 0 0.5 GEM 2 100 48 × 32 8 0 0.5 GEM 3 100 48 × 32 SXL 0 0.5 Gaussian
ΨΠυ࣓ґଘੑ 34 run Mass Ratio Space(λi ) nm GF D(λi
) perturbation 1 100 48 × 32 8 0 0.5 GEM 5 100 48 × 32 8 0.5 0.5 GEM
݁ (2/2) • ߴΤωϧΪʔిࢠ X-line ͰͷՃޙʹ pileup ྖҬ and/or ࣓ؾౡ߹ମྖҬͰ͞Β
ʹՃΛड͚ͯੜ͞ΕΔ • ϦίωΫγϣϯͷεέʔϧͱͱʹ࣓ؾౡ ߹ମྖҬͰͷՃݦஶʹͳΓଟͷඇ తిࢠΛੜ͢Δ 35