ࢭ࢖ࣝࡣ㸪ᝨᫍ㛫⯟⾜᫬࡟ࡣኴ㝧㢼ࣉࣛࢬ࣐⎔ቃ୰ ࡟Ꮡᅾࡍࡿ㸬ࡇࡢ࡜ࡁ㸪ࢭ࢖ࣝࡢࢫࢣ࣮ࣝ㛗ࡀኴ㝧 㢼ࣉࣛࢬ࣐ࡢࢹࣂ࢖㛗ࡼࡾ኱࡛࠶ࡿࡓࡵ㸪ࢭ

➨ ᅇࠕᏱᐂ⎔ቃࢩ࣏ࣥࢪ࣒࢘ࠖㅮ₇ㄽᩥ㞟

207

ᝨᫍ㛫⯟⾜࡟ྥࡅࡓࢯ࣮࣮ࣛࢭ࢖ࣝ࿘㎶ࡢࣉࣛࢬ࣐ᣲືᇶ♏ゎᯒ

ۑᮧ୰ᓫಙ㸦JEDI/JAXA㸧㸪ୖ⏣⿱Ꮚ㸦ISAS/JAXA, JST/CREST㸧㸪⮻஭ⱥஅ㸦⚄ᡞ኱㝔㸧㸪

⠛ཎ⫱㸦ISAS/JAXA㸧

Fundamental Analysis of Plasma Behavior around a Solar Sail for Interplanetary Flight

by

Takanobu Muranaka, Hiroko O. Ueda, Hideyuki Usui, and Iku Shinohara (ISAS/JAXA)

Key Words: solar sail, 3D electrostatic full Particle-In-Cell Code, spacecraft charging, photoelectron emission

㸯㸬ࡣࡌࡵ࡟

⌧ᅾ㸪ᮏ◊✲ࢢ࣮ࣝࣉ࡛ࡣᏱᐂᶵ࡜ࡑࡢ࿘㎶࡟Ꮡ ᅾࡍࡿࣉࣛࢬ࣐࡜ࡢ┦஫స⏝ࡢヲ⣽ࢆゎᯒࡍࡿࢶ࣮

ࣝࡢࡦ࡜ࡘ࡜ࡋ࡚㸪኱ᆺィ⟬ᶵ࡛ࡢ኱つᶍ୪ิ₇⟬

⏝3ḟඖ᏶඲⢏Ꮚ㟼㟁ࢥ࣮ࢻࢆ㛤Ⓨࡋ࡚࠸ࡿ㸬ᮏࢥ࣮

ࢻࡣ㸪Particle-In-Cell (PIC) ἲ¹⁾࡟ᇶ࡙ࡁ㸪ࣉࣛࢬ࣐୰

ࡢ࢖࢜ࣥ࡜㟁Ꮚ࡟ࡘ࠸࡚㸪㐠ື᪉⛬ᘧࢆ㝧࡟ゎࡃࡇ

࡜࡛┤᥋㌶㐨ࢆồࡵ㸪㟼㟁ሙ࡟ࡘ࠸࡚ࡣࣇ࣮࢚ࣜኚ

᥮࡟ࡼࡗ࡚┤᥋ゎࢆồࡵࡿࡓࡵ㸪ࡑࢀࡒࢀ࡟ࡘ࠸࡚

ཝᐦゎࢆᚓࡿࡇ࡜ࡀ࡛ࡁࡿ࡜࠸࠺≉ᚩࢆᣢࡘ㸬⌧ᅾ 㛤Ⓨࡢ➨୍ẁ㝵࡜ࡋ࡚㸪3ḟඖ➼ᖜ┤஺᱁Ꮚࢆ㐺⏝ࡋ ࡓィ⟬ࣔࢹࣝࡢᇶᮏᶵ⬟ࡢ㛤Ⓨࢆ࡯ࡰ᏶஢ࡋࡓ㸬㛤

Ⓨࡋࡓࢥ࣮ࢻࢆ౑⏝ࡋ࡚㸪ࡇࢀࡲ࡛࡟㸪⛉Ꮫ⾨ᫍ࡟

ࡼࡿ㟁఩ィ ࡢ㧗ᗘ໬࡟㛵ࡍࡿࢩ࣑࣮ࣗࣞࢩࣙࣥ࡞

࡝ࢆ⾜ࡗ࡚ࡁࡓࡀ㸪ࡇࡇ࡛ࡣ㸪ᮏࢥ࣮ࢻࡢ᪂ࡓ࡞ゎ ᯒᑐ㇟࡬ࡢᒎ㛤࡜ࡋ࡚㸪ᝨᫍ㛫⯟⾜ࢩࢫࢸ࣒ࡢࡦ࡜

ࡘ࡛࠶ࡿࢯ࣮࣮ࣛࢭ࢖ࣝ࿘㎶ࡢࣉࣛࢬ࣐ᣲືゎᯒࢆ

⾜ࡗࡓ㸬

㸰㸬ࢯ࣮࣮ࣛࢭ࢖ࣝືసཎ⌮࡜ࣉࣛࢬ࣐⎔ቃ ࢯ࣮࣮ࣛࢭ࢖ࣝࡣ㸪ࡑࡢྡࡀ♧ࡍࡼ࠺࡟㸪ኴ㝧ග ᅽࢆ᥎㐍ຊ࡜ࡋ࡚฼⏝ࡍࡿᏱᐂᶵ࡛࠶ࡿ㸬࠾ࡼࡑȣ Pa⛬ᗘࡢᚤᑠ࡞ኴ㝧ගᅽ࠿ࡽᏱᐂᶵࡢ᥎ຊࢆᚓࡿⅭ

࡟㸪10⁴m²⛬ᗘࡢ㠃✚ࡢⷧ⭷ࢆ㸪ኴ㝧ගᅽࢆཷࡅࡿ

ᕹ࡜ࡋ࡚౑⏝ࡍࡿࡇ࡜ࡀ⪃࠼ࡽࢀ࡚࠸ࡿ㸬ࢯ࣮࣮ࣛ

ࢭ࢖ࣝࡣ㸪ᝨᫍ㛫⯟⾜᫬࡟ࡣኴ㝧㢼ࣉࣛࢬ࣐⎔ቃ୰

࡟Ꮡᅾࡍࡿ㸬ࡇࡢ࡜ࡁ㸪ࢭ࢖ࣝࡢࢫࢣ࣮ࣝ㛗ࡀኴ㝧 㢼ࣉࣛࢬ࣐ࡢࢹࣂ࢖㛗ࡼࡾ኱࡛࠶ࡿࡓࡵ㸪ࢭ࢖ࣝ࿘

㎶ࡢࣉࣛࢬ࣐✵㛫ศᕸࢆゎᯒࡍࡿ஦ࡣ㸪ࢭ࢖ࣝ࿘㎶

࡟఩⨨ࡍࡿ࣌࢖࣮ࣟࢻ࠾ࡼࡧྛ✀ィ ჾࡢ㓄⨨ࢆỴ ᐃࡍࡿୖ࡛㔜せ࡛࠶ࡿ࡜ゝ࠼ࡿ㸬ࡲࡓ㸪᪥↷᫬࡟࠾

ࡅࡿኴ㝧㢼ࣉࣛࢬ࣐⎔ቃ࡛ࡣ㸪⫼ᬒࣉࣛࢬ࣐࡟ຍ࠼

࡚㸪ග㟁Ꮚ㟁ὶࡀ୺せ࡞㟁ὶᡂศ࡛࠶ࡿࡓࡵ㸪ࡇࡢ ᙳ㡪ࡶ⪃៖ࡍࡿᚲせࡀ࠶ࡿ㸬

㸱㸬ࢯ࣮࣮ࣛࢭ࢖ࣝ࿘㎶ࡢࣉࣛࢬ࣐ᣲືゎᯒ

ᮏ⠇࡛ࡣ㸪㛤Ⓨࡋࡓ3ḟඖ᏶඲⢏Ꮚ㟼㟁ࢥ࣮ࢻ࡟ࡼ

ࡿ㸪ࢯ࣮࣮ࣛࢭ࢖ࣝ࿘㎶ࡢࣉࣛࢬ࣐ᣲືゎᯒ⤖ᯝ࡟

ࡘ࠸࡚ሗ࿌ࡍࡿ㸬୺࡞ゎᯒ┠ᶆࡣ㸪㸯㸧ࢯ࣮࣮ࣛࢭ

࢖ࣝࡢᵓయᾋື㟁఩ࢆồࡵࡿ஦㸪㸰㸧ᨺฟග㟁Ꮚࢆ

ྵࡴࢯ࣮࣮ࣛࢭ࢖ࣝ࿘㎶ࡢࣉࣛࢬ࣐✵㛫ศᕸࢆồࡵ

ࡿ஦㸪ࡢ2Ⅼ࡛࠶ࡿ㸬㸯㸧࡟ࡘ࠸࡚ࡣ㸪Ᏹᐂᶵᖏ㟁ゎ ᯒࢯࣇࢺ࢙࢘࢔MUSCAT࡟ࡼࡿணഛⓗゎᯒࢆཧ↷ࡋ ࡓ㸬ࡲࡓ㸪㸰㸧࡟ࡘ࠸࡚ࡣ㸪ࢯ࣮࣮ࣛࢭ࢖ࣝࡢࢫࢣ

࣮ࣝ㛗࡟ࡼࡿ㐪࠸ࡶ᳨ドࡋࡓ㸬

Table 1࡟ࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟౑⏝ࡋࡓྛ✀ࣃ࣓ࣛ

࣮ࢱࢆ♧ࡍ㸬ࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟⪃៖ࡋࡓⲴ㟁⢏Ꮚ ࡣ㸪⫼ᬒ㟁Ꮚ㸪Ỉ⣲࢖࢜ࣥ㸪࠾ࡼࡧග㟁Ꮚ࡛࠶ࡿ㸬 ィ⟬᱁Ꮚࡣග㟁Ꮚࡢࢹࣂ࢖㛗┦ᙜࡢ㛗ࡉ0.5mࢆ✵㛫

้ࡳᖜ࡜ࡋ࡚ᵓᡂࡋࡓ㸬Fig. 1࡟ィ⟬య⣔ࢆ♧ࡍ㸬ࢯ

࣮࣮ࣛࢭ࢖ࣝࡣ⯟⾜᫬㸪ኴ㝧ග࠾ࡼࡧኴ㝧㢼࡟ᑐࡋ

࡚45ᗘࡢഴᩳゅࢆᣢࡘࡀ㸪ࡇࡇ࡛ࡣ⡆༢ࡢࡓࡵࡇࢀ

ࡽࡀࢭ࢖ࣝ࡟ᑐࡋ࡚ᆶ┤ධᑕࡍࡿ࡜ࡋࡓ㸬

ࡲࡎጞࡵ࡟㸪ࡇࢀࡽࡢࣉࣛࢬ࣐⎔ቃ࡛ࡢࢯ࣮࣮ࣛ

ࢭ࢖ࣝࡢᾋື㟁఩ࢆồࡵࡓ⤖ᯝ㸪࠾ࡼࡑ+4.3Vࡢᐃᖖ

್ࡀᚓࡽࢀࡓ㸬ᮏࢩ࣑࣮ࣗࣞࢩࣙࣥ௨๓࡟㸪⣽⏣࡜

ඵ⏣࡟ࡼࡗ࡚㸪MUSCAT࡟ࡼࡿྠࢯ࣮࣮ࣛࢭ࢖ࣝࣔ

ࢹࣝࡢᖏ㟁ィ⟬²⁾ࡀᐇ᪋ࡉࢀࡓ㸬ࡇࡢ⤖ᯝ࡛ࡣFig.2

Table 1. Computation parameters for a solar wind environment.

This document is provided by JAXA.

Ᏹᐂ⯟✵◊✲㛤Ⓨᶵᵓ≉ู㈨ᩱ䚷JAXA–SP–09–006

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࡟♧ࡍࡼ࠺࡟㸪ࢯ࣮࣮ࣛࢭ࢖ࣝࡢᾋື㟁఩ᐃᖖ್ࡣ

࠾ࡼࡑ+10V࡜࡞ࡾ㸪⿬㠃⤯⦕య࡜ࡢ㟁఩ᕪ࡛࠶ࡿ஋

㞳㟁఩ࡶᖏᨺ㟁⌧㇟࡟ၥ㢟࡞࠸⛬ᗘ࡛࠶ࡿ⤖ᯝࡀᚓ

ࡽࢀ࡚࠸ࡿ㸬ࡇࡇ࡛㸪MUSCATࢩ࣑࣮ࣗࣞࢩ࡛ࣙࣥ

ࡣ㸪ኴ㝧ග࠾ࡼࡧኴ㝧㢼ࡣࢯ࣮࣮ࣛࢭ࢖ࣝ㠃࡟ᑐࡋ

࡚45ᗘධᑕࡢ᮲௳࡛ᖏ㟁ィ⟬ࡀᐇ⾜ࡉࢀ࡚࠾ࡾ㸪ࡲ

ࡓ㸪Ⲵ㟁⢏Ꮚࡢᙳ㡪࡜ࡋ࡚㸪ග㟁Ꮚ࡟ຍ࠼࡚㸪஧ḟ 㟁Ꮚࡶ⪃៖ࡉࢀ࡚࠸ࡿ㸬

Fig. 3࡟ࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝ࡟ࡼࡗ࡚ᚓࡽࢀࡓ㸪

⫼ᬒ࢖࢜ࣥ࠾ࡼࡧ㟁Ꮚࡢ✵㛫ศᕸࢆ♧ࡍ㸬ኴ㝧㢼ࢻ

ࣜࣇࢺ㏿ᗘࡣ㸪⫼ᬒ࢖࢜ࣥࡢ㡢㏿࡟ᑐࡋ࡚࣐ࢵࣁᩘ

10⛬ᗘࡢ㉸㡢㏿࡛࠶ࡿࡓࡵ㸪ࢯ࣮࣮ࣛࢭ࢖ࣝࡢୗὶ

࡛ᐦᗘࡀᕼⷧ࡜࡞ࡿwake㡿ᇦࡀⓎ⏕ࡍࡿ㸬୍᪉㸪⫼

ᬒ㟁Ꮚ࡟ᑐࡋ࡚ࡣ㸪ྠࢻࣜࣇࢺ㏿ᗘࡣள㡢㏿࡛࠶ࡿ

ࡓࡵ㸪᫂░࡞wake㡿ᇦࡣⓎ⏕ࡋ࡞࠸㸬ࡇࡢࡓࡵ㸪ࢯ

࣮࣮ࣛࢭ࢖ࣝࡢୗὶ࡛ࡣ㸪⫼ᬒ㟁Ꮚࡀᐦ࡜࡞ࡾ㸪Fig.

4࡟♧ࡍࡼ࠺࡟㸪㈇ࡢ✵㛫㟁఩ࡀᙧᡂࡉࢀࡿ㸬

Fig. 5࡟ࢯ࣮࣮ࣛࢭ࢖ࣝ୰ᚰ࡛ࢫࣛ࢖ࢫࡋࡓ㸪ග㟁Ꮚ

ᩘᐦᗘࡢ2ḟඖ✵㛫ศᕸࡢ᫬㛫Ⓨᒎࢆ♧ࡍ㸬ࡇࢀࡽࡢ ᅗࡢ୰ᚰ࡟఩⨨ࡍࡿࢭ࢖ࣝࡢྑഃࡀ᪥↷㠃࡛㸪ࡇࡢ

Fig. 2 Electric potential distribution on a conductor of a solar sail model obtained by MUSCAT analysis. We use the same plasma parameters for our computation as used in this simulation. The direction of the solar flux and the solar wind is 45 degrees from the normal of the surface.

Fig. 1 Numerical domain and geometric condition of the simulation. The y-direction into the paper has the same geometry as the z-direction.

Fig. 3 Spatial distributions of the ambient ions (above) and electrons (below) at 0.5 ms in xy-plane (z=64). Contours show the number density of the ions and electrons in m^-3. Numerical domain is 128*128*128 in X*Y*Z dimensions. A wake structure of ambient ions is recognized in the downstream region behind the model.

Fig. 4 Spatial distribution of the electric potential (V) in zx-plane (y=64) at 0.5 ms. Negative potential up to -2.0 V is shown in the downstream region behind the model due to ion wake.

This document is provided by JAXA.

➨ ᅇࠕᏱᐂ⎔ቃࢩ࣏ࣥࢪ࣒࢘ࠖㅮ₇ㄽᩥ㞟

209

㠃࠿ࡽග㟁Ꮚࡀᨺฟࡉࢀࡿ㸬ᨺฟࡉࢀࡓග㟁Ꮚࡣ㸪

ࢭ࢖ࣝࡢ⿬㠃࡬࡜ᣑᩓࡋ࡚࠸ࡃᵝᏊࡀ☜ㄆฟ᮶ࡿࡀ㸪 ኴ㝧㢼ୗὶഃ࡛㈇ࡢ✵㛫㟁఩ࡀᙧᡂࡉࢀࡿ㡿ᇦ࡟ࡣ㸪 ග㟁Ꮚࡣᣑᩓ࡛ࡁ࡞࠸ࡇ࡜ࡀศ࠿ࡿ㸬ࡲࡓ㸪ᮏࢣ࣮

ࢫ࡛ࡣࢭ࢖ࣝࡢ⿬㠃୰ᚰ㏆ഐ࡟ᣑᩓࡍࡿග㟁Ꮚᩘᐦ ᗘࡣ㸪⫼ᬒ㟁Ꮚᩘᐦᗘ࡜࠾ࡼࡑ➼ࡋ࠸࣮࢜ࢲ࣮࡜࡞

ࡗࡓ㸬

ḟ࡟㸪ࢯ࣮࣮ࣛࢭ࢖ࣝ࿘㎶ࡢࣉࣛࢬ࣐ᣲື࡟ᑐࡍ

ࡿ㸪ࢭ࢖ࣝࡢࢫࢣ࣮ࣝ㛗ࡢᙳ㡪ࢆㄪᰝࡍࡿⅭ࡟㸪ࢭ

࢖ࣝ㠃✚ࢆ๓ࢣ࣮ࢫࡢ㸲ಸ࡜ࡋ࡚ྠᵝࡢࢩ࣑࣮ࣗࣞ

ࢩࣙࣥࢆ⾜ࡗࡓ㸬ࢭ࢖ࣝࡢࢧ࢖ࢬࡣ28*28*0.5(m)࡛࠶

ࡿ㸬Fig. 6࠾ࡼࡧFig. 7࡟㸪ࡑࢀࡒࢀ✵㛫㟁఩࡜ග㟁Ꮚ

ᩘᐦᗘࡢ஧ḟඖࣉࣟࢵࢺࢆ♧ࡍ㸬๓ࢣ࣮ࢫ࡜ྠᵝ࡟㸪 ࢯ࣮࣮ࣛࢭ࢖ࣝୗὶഃ࡛ࡣ㸪࢖࢜ࣥwake࡟㉳ᅉࡍࡿ

㈇ࡢ✵㛫㟁఩ࡀᙧᡂࡉࢀࡿࡀ㸪ࡑࡢ᭱ᑠ್ࡀ๓ࢣ࣮

ࢫ࡛ࡣ-2V࡛࠶ࡗࡓࡢ࡟ᑐࡋ࡚㸪ᮏࢣ࣮ࢫ࡛ࡣ-6Vࡲ

࡛పୗࡋࡓ㸬✵㛫㟁఩ࡢ᭱ᑠ್ࡀపୗࡍࡿ஦࡛㸪ࢯ

࣮࣮ࣛࢭ࢖ࣝࡢ⿬㠃୰ᚰ࡟ᣑᩓࡍࡿග㟁Ꮚᩘᐦᗘࡶ

పୗࡋ㸪ᮏࢣ࣮ࢫ࡛ࡣ⫼ᬒ㟁Ꮚᩘᐦᗘ࡜ẚ㍑ࡋ࡚2᱆ ௨ୖప࠸್࡜࡞ࡿࡇ࡜ࡀศ࠿ࡗࡓ㸬ࡇࡢࡼ࠺࡟㸪ࢯ

࣮࣮ࣛࢭ࢖ࣝࡢࢫࢣ࣮ࣝ㛗ࡀኚ໬ࡍࡿ࡜㸪ࢭ࢖ࣝࡢ

ୗὶഃ࡟ᙧᡂࡉࢀࡿ✵㛫㟁఩࡟ᙳ㡪ࢆཬࡰࡋ㸪ࢭ࢖

ࣝ⿬㠃㏆ഐ࡬ࡢග㟁Ꮚᣑᩓ⠊ᅖࡀኚ໬ࡍࡿ࡜ゝ࠼ࡿ㸬

Fig. 5 Spatial distributions of the photoelectrons at t=0.025 ms (top), 0.125 ms (middle) and 0.5 ms (bottom) in zx-plane, respectively. Contours show the number density of the photoelectrons in m^-3. Numerical domain is 128*128*128 in X*Y*Z dimensions. Part of photoelectrons originally emitted from the right hand side surface of the model in the figures diffuse to the rear surface of the model.

Fig. 6 Spatial distributions of the photoelectrons at t=0.5 ms in zx-plane at y=128 grid without plasma flow. Contours show the number density of the photoelectrons in m^-3. The X- and Z-axis are in grid number.

Fig. 7 Spatial distributions of the photoelectrons at t=0.3 ms in zx-plane at y=128 grid around the object of 0.5m*28m*28m. Contours show the number density of the photoelectrons in m^-3. The X- and Z-axis are in grid number.

Numerical domain is 256*256*256 in X*Y*Z dimensions.

This document is provided by JAXA.

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㸲㸬ࡲ࡜ࡵ

ᮏ◊✲ࢢ࣮ࣝࣉ࡛ࡣᏱᐂᶵ࡜ࡑࡢ࿘㎶࡟Ꮡᅾࡍࡿ

ࣉࣛࢬ࣐࡜ࡢ┦஫స⏝ࡢヲ⣽ࢆゎᯒࡍࡿࢶ࣮ࣝࡢࡦ

࡜ࡘ࡜ࡋ࡚㸪኱ᆺィ⟬ᶵ࡛ࡢ኱つᶍ୪ิ₇⟬⏝3ḟඖ

᏶඲⢏Ꮚ㟼㟁ࢥ࣮ࢻࢆ㛤Ⓨࡋ࡚࠸ࡿ㸬㛤Ⓨࡋࡓࢥ࣮

ࢻࢆ౑⏝ࡋ࡚㸪ḟୡ௦ᝨᫍ㛫⯟⾜ࢩࢫࢸ࣒ࡢࡦ࡜ࡘ

࡜⪃࠼ࡽࢀ࡚࠸ࡿࢯ࣮࣮ࣛࢭ࢖ࣝ࿘㎶ࡢࣉࣛࢬ࣐ᣲ

ືࡢᇶ♏ⓗゎᯒࢆ⾜ࡗࡓ㸬ኴ㝧㢼ࣉࣛࢬ࣐࡜ග㟁Ꮚ ࡀᏑᅾࡍࡿ⎔ቃ᮲௳࡛ࡇࡢゎᯒࢆ⾜ࡗࡓ⤖ᯝ㸪௨ୗ

ࡢᵝ࡞⤖ㄽࡀᚓࡽࢀࡓ㸬

㸯㸧ኴ㝧㢼ࣉࣛࢬ࣐࡜ග㟁Ꮚ⎔ቃ࡛ࡣ㸪ࢯ࣮࣮ࣛࢭ

࢖ࣝࡢᾋື㟁఩ࡣ+4V⛬ᗘ࡜࡞ࡿ㸬⿬㠃ࡀㄏ㟁యࡢሙ

ྜࡢ஋㞳㟁఩ࡣᖏᨺ㟁⌧㇟࡟ၥ㢟࡞࠸⛬ᗘ࡛࠶ࡿ஦

ࡀMUSCAT࡟ࡼࡿゎᯒ࠿ࡽᚓࡽࢀ࡚࠸ࡿ㸬

㸰㸧ࢯ࣮࣮ࣛࢭ࢖ࣝ⿬㠃ഃ࡛ࡣ㸪࢖࢜ࣥwake࡟㉳ᅉ ࡍࡿ㈇ࡢ✵㛫㟁఩ࡀᙧᡂࡉࢀ㸪ࡇࡢ㡿ᇦ࡬ࡢග㟁Ꮚ ᣑᩓ⠊ᅖ࡟ᙳ㡪ࢆཬࡰࡍ஦ࡀ☜ㄆฟ᮶ࡓ㸬

㸱㸧ࢯ࣮࣮ࣛࢭ࢖ࣝࡢࢫࢣ࣮ࣝ㛗ࡣ㸪ࢭ࢖ࣝ⿬㠃ഃ

࡟ᙧᡂࡉࢀࡿ㈇ࡢ✵㛫㟁఩ࡢ኱ࡁࡉࢆኚ໬ࡉࡏ㸪ࡑ ࡢ⤖ᯝ࡜ࡋ࡚ࢭ࢖ࣝ⿬㠃୰ᚰ௜㏆࡟ᣑᩓࡍࡿග㟁Ꮚ

ᩘᐦᗘࢆኚ໬ࡉࡏࡿ஦ࡀศ࠿ࡗࡓ㸬ᮏࢩ࣑࣮ࣗࣞࢩ

ࣙࣥࡢ౛࡛ࡣ㸪኱ࡁࡉ14.0*14.0*0.5(m)ࡢࢭ࢖ࣝࡢሙ

ྜ㸪ࡇࡢ㡿ᇦ࡟ᣑᩓࡍࡿග㟁Ꮚᩘᐦᗘࡣ㸪࡯ࡰ⫼ᬒ 㟁Ꮚᩘᐦᗘ࡜➼ࡋ࠸࣮࢜ࢲ࡛࠶ࡾ㸪ࡇࡢ㸲ಸ㠃✚

28.0*28.0*0.5(m)ࡢሙྜ㸪ྠග㟁Ꮚᩘᐦᗘࡣ㸪⫼ᬒ㟁 Ꮚᩘᐦᗘ࡜ẚ㍑ࡋ࡚2᱆௨ୖᑡ࡞࠸஦ࡀศ࠿ࡗࡓ㸬

ㅰ㎡

MUSCAT࡟ࡼࡿࢯ࣮࣮ࣛࢭ࢖ࣝࡢணഛⓗᖏ㟁ゎᯒ

⤖ᯝࡢᥦ౪࡟ᑐࡋ࡚㸪JAXAᏱᐂ⛉Ꮫ◊✲ᮏ㒊ࡢ⣽⏣

⪽ྐẶ㸪ᰴᘧ఍♫MUSCATࢫ࣮࣌ࢫ࢚ࣥࢪࢽ࢔ࣜࣥ

ࢢࡢඵ⏣┿ඣẶ࡟ㅰពࢆ⾲ࡋࡲࡍ㸬

ཧ⪃ᩥ⊩

[1] Birdsall, C. K., and Langdon, A. B, Plasma Physics via Computer Simulation, McGraw-Hill, New York, 1985.

[2] Hosoda, S., Tanaka, K., Toyoda, H., Miyake, H.,

“Fundamental Experiment for Charging Measurement on a Solar Sail Foil,” Space Plasma Workshop 2008, ISAS/JAXA, Sagamihara, March 6, 2009. (in Japanese)

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