 $"#!

2007-07-03

!

Mars Dust Counter(MDC)&19982002
 "!# #$% &"!
)('MDC -   135 " $!
 ! !
% "% "  "#  "! !




""!

 

NOZOMI Schedule and Troubles• 98-07 Launch• 98-12 Use too much fuel at leaving from the Earth(powered fly-by).
Change of orbital plan.
Mars arrival 99-10 => 03-12• 99-07 Stop S-band downlink.
Less problem except occultation experiment• 02-04 Trouble on CI-PSU (possibly by intense solarflare). Maybe a short-circuit.

Mars Dust Counter (MDC)•,429",46# ,403*;!
•730g (2<7 )•124 x 115 mm2 (7• 5/.

• 18+
18$ &IDP.
• -'.

&:)%/

10-10

Mass [g]• 120,4.
(100: 03*;%/)

m-1998m-1999m-2000m-2001-02

10-9

10-11
10-12
10-13
10-14
10-15
10-16

110Velocity [km/s]

100  m-1998
m-1999m-2000m-2001-02

10-9

Mass [g]

10-10
10-11
10-12
10-13
10-14
10-15
10-16

110
Velocity [km/s]

100

NOZOMI
EARTH
MARS1999 Impacts  v < 10km/s
10-30km/s
v > 30km/s

2 108y

1 108

SUN

0

-1 108-2 108-2 108-1 108

0x

1 108

2 108



  NOZOMI
EARTH
MARS

1999 Impacts
2 108b

1 108ay

Vidp < 30km/s
30 < Vidp < 40km/s
Vidp > 40km/s

SUN0ce-1 108dInterstellar Flow

-2 108-2 108-1 108

0X

1 108

2 108

NOZOMI
EarthMars

2000Jan-2001Jun Impacts  v < 10km/s
10 <v<30km/s
v > 30km/s

2 108y

1 108

SUN0

-1 108-2 108-2 108-1 108

0x

1 108

2 108

NOZOMI
EarthMars

2000Jan- 2001Jun  

Vidp < 30km/s
30 < Vidp < 40km/s
Vidp > 40km/s

2 108y

1 108

SUN0f

-1 108Interstellar Flow

-2 108-2 108-1 108

0x

1 108

2 108

2001Jul- 2002Apr  NOZOMI
EARTH
MARS

Vidp < 30km/s
30 < Vidp < 40km/s

2 108y1 108

SUN0-1 108
Interstellar Flow

-2 108-2 108-1 1080x

1 108

2 1082000-2001 Impacts
100

Orbital Velocity [km/s]

m > 1012 gm < 1012 g

10108

2 108
Heliocentric Distance [km]

MDC&.-),(.-)*+'!#%11"  $ 

MDC
:,'6+=DILLLGIFJHHJGKE
.43)08-7B;C<!9A2(1999>506)*/!
2000-2001>0
2001-2002>.4
 MDC$@1% 6)*/!"# ?&MDC  536)217;

Charge signal mass , velocityt = c g v± Q / m = cr v

Q (charge)

t : Rise time v:Velocity
Q : Charge m : MassCg, Cr, , : Constants[Igenbergs et al., 1998]

tImpact (+-"/,)0 *%!'& #$8:49 ),536)'*,/.

 
Cassini - CDA 17kg

NOZOMI-MDC 0.73kg

%/-0• ,+.$• MDC
!

– 1$1

• CDA

30cm#20kg• *')/-0%%"($&  I

(CSA)

Target50mm(CSA)New Type II  150mm

30cm 749(IID)."
• 749.;A9>8@
– >8@DI– >8@DII– >8@DIII

H14H15H17• 7490(*$#749.
&''<2AB315Ev 2-100km/s• 0)+749,)+-:?=D60 ''!C%/.@D9*,%

<78

*;0

(+"!

>-51:9!=#/&2'$;$4!
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3&• X'MAXI(• " $&'SEDA-AP(•  !"%%#'SMILES(&: !270 !8; 9• Extreme Universe Space Observatory
onboard JEM/EF8JEM-EUSO9*15,7"+63
8CALET: CALorimetric Electron
Telescope9• ADR-./4'&$()#%'•[eV)fh6*.g• McWaeRX`5G2• <+SPVdUX_1#•&3>!0#• PY^MVH9:G>4#QcN• ' 1#\TO]c/-fSEDAg-?
• @CIBA;7K)DE( $:"G2• ELJJf &F,8G(%F %G g• EVAbZTVG2=IID (Impact Ionization Detector)
at ISS (International Space Station)•  30cm 0.07m2• •  •   •   • 400km (361 - 437 km)•  51.63 IID*• /.2*–  /.2–  /.29 :–  /.29:– &!(+*/.2950-7,3:– % /.2• 146*• %• '';''"8$)#9IGL!
• LDEF ,332-580 km --CMOS

– %6. 8100/m2/day -KOQ<– %:291/10– 8NPJFG9 /?
– $S"'90 0• GORID *#&--- )( -+–  814/m2/day Tsolid rocket motor9 8>@BMCH735EDRL34=91;A50@U$#+),
• LDEF 2• /! "-&*('.,%#• "10-100/m2/day!0 1• 0.07m2! 0.7-7

"

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• +,– .,:=735,"

• 9;>0•,9A6• • @.,)- ,/• 9;>2$ISS*&'• -# (%1"• "–  – % >10 km/s)–"%>20km/s)• !#$–  
–  %<10km/s <5km/s)

"PNR?=•  /,2@A '– +-('2D4;F– B6H)# =JWZV[]MX\C93F1C• . 293F–  UYQKN=#>93F1– PNR)# =!^*/ &?=_•3;"&1E&>$5GF1`– %< 5GFPNRT\S– ;4:C10micronLIO=&<>;780F

87920":•-0– ,0-0 1#5&– /45 $•$,1&$879' .$-$+)1
(5*6%&• 8790– ISS0 /3!;EA;CD<:>
• 4214/5 )+'.detect%*#,7!"32-.#8• (44@B?;=%&#06444inventory3 9$8• 2011or•• –2013&/#• 100@5BC0*,., 2$1• ,*-
• %"%100@5BC83:,<9>,2()!+!
• 492 %'-"E•  ,6A=?;D7=>, 
• $'•(•& !
– induced charge–  "%#TOF

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,/ .!FDI%?(• KANOB@E9FDI" 9/)/&+?59
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• 86=71FDI:*$7