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Vol.2??????ή???פ??Ф??뤴?ո?

̾?Ų???إץ饺?ޥʥι??ظ??楻?󥿡?????Ϸ?͡??? ??Ǥ?ڶ???

?ڹ?Ω???ϸ????ʸ?MU?졼??????¬??ˤ???¼ ??? ?????Υ????ȡ?
???᡼??ǿ????夲???褦??ή?????ˤĤ??ƤϤɤ????ٰʾ?Τ?Τ򤫤????뤫??????ή????????ή?????ⴶ?٤Ǥ?????ή???ʤɡˤˤ?ä????????ۤʤ?ޤ???????Ƚ??????̤˽??⤬????Ȥ????Τ??̼????Ȼפ??ޤ??????Ԥϴ?¬?ǡ??????դ??Ƥ?ɤ????ٰʾ??ή???򤫤????뤫?ǰ????Ф?Ф?Ǥ???????Ԥϴ?¬???ʤ?Ф䤬?????٤??褯?ʤ?????Ǥ??????????ä????ԤϤ???ϴְ㤤?Ȥ????????ʤΤ?ΤǤʤ??Ǥ???????Ԥϻ??¤???¿?????ʤ??Ȥ?????????????????ƥ??ե??å??ˤ??ꤦ??Ȼפ??ޤ???


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???ܺ???ؤ????Ĥ?????Խ????????ܺ???ع????? ???Ĺ????ڶ????ˤ?桹?ιⴶ?٥ӥǥ???????I.I.CCTV, I.I.-HDTV?ˤˤ???¬?Ǥϡ?ɸ???󥺤λ?????ʹ???110km?ˤ?????4000 km^2?ˤ?????Ǹ??????5?????????뤤??ή???νи????ϡ?????????ˤ?ä???ư??????ޤ?????1???֤??????6??40?????٤Ǥ?????
??????Ǹ?????ή?????ϵ夬?ʤ???????ŷĺ?ˤ?????????????ˤ?¿???и?????ȿ??¦??ͼ???ˤ϶?ü?˾??ʤ??Τǡ??嵭??????ή?????򥶥å?????ϵ?Ⱦ??????ѤˤĤ??ƴ???????ȡ?1????????900????6,000???Ĥ??餤?ˤʤ?ޤ??ʺ????դ???ʸ???ˤϷǺܤ??Ƥ??ʤ?????????ʿ??͡ˡ?


MU?졼??????ª????ή???ο??ˤĤ???

??MU?졼?????δ?¬?ˤĤ???Ĵ?٤Ƥߤ??Ȥ???J. Kero et al., "First results from the 2009-2010 MU radar head echo observation programme for sporadic and shower meteors: the Orionids 2009", MNRAS, 416, 2550-2559, 2011?ˤϥإåɥ??????⡼?ɡ?ή?????絤?????̤ˤ????ˡŪ?????Ȥλ???򸡽Ф????¬?⡼?ɡ?ή???Τ????Τʵ?ƻ????̤???뤳?Ȥ???ǽ?????Ū?礭??ή???Τ???¬?оݡ??ˤǸ??в?ǽ??ή???ΤκǾ????̤?10^-9 kg?Ȥ???ޤ???
?????λ??δ?¬?Ǥ????????˻???ή???????ԡ????ˤʤ?30 [km^-2 hour^-1]?Ǥ??ꡢ???ش?¬??Ʊ?ͤ?ͼ???ˤϤۤȤ?ɸ??Ф???Ƥ??ޤ??󡣤????ͤ??饶?å?????ϵ?Ⱦ??????ѤˤĤ???1?????????ή?????˴????????30*24*2*??*(6,400)^2=1900????/?????Խ???????NHK?η׻???ˡ??Ʊ?????ϵ?????Ǵ????????3700????/???ˤˤʤ?ޤ???

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??NHK??TV???롼????¬?????ꤷ???Ȥ??ˡ??졼?????Ǵ?¬????1?ա?1????ˤ?ή???ε?ƻ??¬??Ҳ𤷤ޤ???????????ϵ?????24???֤˴????????Τ?2???Ĥǡ?MU?졼??????????????ʤ?ä????˴?¬?Ǥ???ή?????Ȥ??????Ȥˤʤ?ޤ??????ο??????ޣ??夯?餤?θ????Τ????̤Ǥ??????????????ʡʰŤ??ˤ?ΤޤǴޤ???ή???ο???????Ū?????礷?ޤ???

?ϵ??ή??????ή???Τ????̤ˤĤ???

?????̤?????γ?Ҥ???????γ?ҡ?ή???Ρˤο???ľ?¤?-2.5????Ѥ˾??ȸ????Ƥ??ޤ??Τǡ??????̤???Ⱦ??Ǿ?????????γ?Ҥ????뤳?Ȥˤʤ?ޤ???ľ?¤?1?塢???ʤ?????̤?3??ۤʤ?ή???Τ??????????1:10^0.5= 1:3.16?ˡ?
????????????????й??????ϵ嵰ƻ?ޤ???ã?Ǥ???γ?Ҥ?̩?٤?1g/cc??ľ?¤?1??m???٤Ǥ???Ȥ???ȡ????̤???10^-15 kg?ˤʤ?ޤ??????Υ??????Ǥ?ñ?̼??̤??????ɽ???Ѥ??礭?????ᡢ??Ǯ?˸??礦??Ѥ??ưפ??????뤿???dz???Ԥ??뤳?Ȥʤ???ɽ????ã????ȹͤ????Ƥ??ޤ??????Τ褦??ή???Τ???̿????ʪ?????ϵ?˱??֤Ȥ??????Ƥ?NHK???ڥ????Ǥ???夲?Ƥ????褦?˵??????Ƥ???ޤ???
???ϵ?ؤ?ή???Τ???ή???̤ˤĤ??ƺǶ????ʸ??Ĵ?٤Ƥߤ??Ȥ?????G. Drolshagen et al., "Comparison of Meteoroid Flux Models for Near Earth Space", Earth, Moon, and Planets,102, 191-197, 2008. ??Abstract?ˡ?The persisting differences even for near Earth space can be seen as surprising in view of the numerous ground based (optical and radar) and in situ (captured Inter Stellar Dust Particles, in situ detectors and analysis of retrieved hardware) measurements and simulations.?ɤȤ???ޤ???????????ȡֿ?¿?????Ͼ?ʸ??ؤ????ȡ˴?¬????????֤ˤ??????¬??ή???Τ???͡?γ?Ҹ??д?Ͼ?˻??????ä??????ˤ???ӥ??ߥ?졼?????θ??Ϥ????᤿?ϵ??˵???֤ˤ?????[ή???Τ??????̤˴ؤ???]??????³???Ƥ?????㤬?ä??٤????Ȥ˰????Ȥ??Ƹ????롣?פȤ??ä??????Ǥ??礦????
???ޤ???U. von Zahn, "The total mass flux of meteoroids into the Earth's upper atmosphere", ESA SP-590, 33-39, 2005?ʺ??ɤʤ??ˤˤ??ȡ?ή???????뤵??????ȿ?Ͷ??١??????Υޥ????????졼????????̤????ΤˤϤ????Ĥ??β??꤬???ꡢ???륵??????ή?????ˤĤ??ƹⴶ??CCTV????????θ??ش?¬?????ȴ?¬?ˤ?äƵ?᤿?͡????뤤?????ȴ?¬?ȱ????Υޥ????????졼???ˤ?äƵ?᤿?ͤ????פ??ʤ????Ȥ?????ˤʤäƤ??ޤ???

????¼ ?????Υ????ȡ? ??von Zahn?Τ??äƤ????ȴ?¬??MU?졼?????κǿ??δ?¬?Τ褦?ʥإåɥ??????Ǥʤ??????״?¬??ή???????פ??Ф??????Ȥ???ľ??ȿ?ͤ??륨?????򸡽Ф????¬?⡼?ɡ?????ή???θ??Ф???ǽ??????????ή????ƻ??ˡ???Ȥ??ƴ?¬??????ޤ?ʿ?̶?˵?˽и?????ή???Τߤ???¬??ǽ?ˤǸ??????礭???ʲ??꤬¿???ˤ?Τ??Ȼפ??ޤ???

????⤢?븦???ǡ????۷ϳ???????ή???פˤĤ???ȯɽ???????˰??Ѥ???ʸ???μ?????ȴ?¬???ͤȡ????Ĥ????桹?ιⴶ?٥????ǡ???????Ӥ??????˳Τ?2?夯?餤?ΰ㤤???????Ƥ??ޤ??ޤ?????

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?????Ť????ȴ?¬?򤤤äƤ?Ȼפ??ޤ???

??????ˡ?ή???Τ??ϵ???Ф???®?٤ˤ?ä????뤵???礭???ۤʤꡢ??®??ή???Ρʼ?˾??????????ˤˤĤ??Ƥ??Գ??????????ʤ??礭???Ϥ??Ǥ??????Τ?????ϵ?ؤ?ή???Τ???ή???????ϸ???Ԥˤ?äưո???ʬ?????Ȥ????ǤϤʤ????Ȼפ??ޤ???

????¼ ?????Υ????ȡ? ??ή?????ϼ??̤????????ʤ?ۤɿ?????ü??¿???ʤ뤿??ʿ???ͤǤε?????ͭ???Ǥʤ????Ȼפ??ޤ??????ȼ??̤?ͤ???Ȥ??ˤ????Ȥˤ??ή???ʥإåɥ??????ˤο?ʬ?ۤ?®?٤Σ???Ȥ??????????ݤ??Ʋ桹?Ͻ??פ??Ƥ??ޤ????????®?٤?®????Τۤɾ???????Τޤ??絤????Υ???뤳?Ȥ??????Ǥ???

??von Zahn???ϵ?ؤ?ή???Τ?1??????ή???̤ˤĤ??Ƥ?äȤ??ɤ??ͤȤ??ƥ??ڡ???????ȥ?ˤ?äƲ?????줿?????Υޥ????????졼????ľ?¤????᤿110??55t??Love & Brownlee, 1993?ˤ?󤲤Ƥ??ޤ???
??¾?ˤϱ????δ???, ????, ?????󲽸??д????????ȡ????ش?¬?????????Ƶ?᤿44t??Hughes, 1978?ˡ??ץ???ȥ륳??300m???쥷??????˾?????¬??1997ǯ11??15-18????1998ǯ11??15-17??????????ή?????γ?ư?????ˤ?4.4t??7.4t??Mathews et al., 2001?ˤ???Ӥ??Ƥ??ޤ???

????¼ ?????Υ????ȡ? ???ϵ????ΤǤɤΤ??餤??ή?????̤??ߤäƤ??뤫??ñ?Τδ?¬???????ΤϤʤ??ʤ????ѤǤ??????桹?ͣե졼?????δ?¬?????졼????????ζ??١ʻ????????ѡˤ?®?٤ˤ??졼?????δ?¬???Ѥκ??ۤʤɤ????????Ƽ??̥ե?å??????Ѥ??ͽ??ˤ??Ƥ??ޤ??????????졼?????Ǹ????ʤ???ʬ?ϳ??ޤ???ʤɤβ???򤹤?ɬ?פ⤢??ޤ???

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