??? ??(16?) GRAVITY - PowerPoint PPT Presentation

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??? ??(16?) GRAVITY

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Title: 1 Author: Yeonghwa Kim Last modified by: Created Date: 8/6/2003 9:27:51 AM Document presentation format: – PowerPoint PPT presentation

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Title: ??? ??(16?) GRAVITY


1
??? ??(16?) GRAVITY
???? ? ??? ?? ??? ? ????? ? ??
2
1) ????? ??
  • m1 me
  • F G -------- m1 g
  • r2
  • g me ? ?? ??? m1 ??? ?????
  • me
  • g G ------
  • r2

3
??? ???
  • ????? ?????? ??? ?? ??? ?????.
  • ????? ??, ??? ?????? ??? ??? ?? ???.

4
  • 2) ?? ? ??

??? ???? (??? ??) ? ????? ?? - ?? ??? ??
(Airy ????? ?? 20-15) ??,??, ????? - ??
????????????(IUGG)
5
? NASA?? ?? ??? ????
The map of the Earth's gravity field provided
by NASA(Jet Propulsion Laboratory)
6
3) ?? ??? ??
  • ??????
  • ??????
  • ?????

????????? ?? 8.14
?????? ??? ??? - ?????? l
?? 16.26
7
3) ???
??????? - ?????? lt10-8Gal
Worden gravimeter
La Coste gravimeter
8
?? ??
a) ?? ? ?? ?? b) ??
9
??? ???
  • ????? ???? ????? ???? ????
  • ?????? ??????? ???? ?? ????
  • ???? ??? ?????.

10
4) ???? ??? ??? ??
  • ??? ????? ??? ??? ??? ???? ????? ???
  • ??? ??? ?? ??? ?? - ??
  • (1)  ??? ?? ?? - ????
  • (2) ??? ?? ?? ?? - ???? ??
  • (3) ??? ?? ?? ?? - ?? ?? 

11
???? ??? ??
  • ???? ??? ??? ?? ??
  • ????? ??? ?? ?? 
  • ?? ????? ???? ??
  • ????? ??? ?? ??
  • ????? ???? ??
  •   ????? ??? ?? ?? ?? 

12
??? ??, ??? (17? 485p)
1) ????? ??? ??????
13
2) ???? ??? ??????- ?????( Geomagnetic Elements)
??? Total component (F), ???? Horizontal
component (H), ???? Vertical component
(Z) ??Declination (D) and ??Inclination (I),
Inclination (I) tan-1(H/F) Declination (D)
tan-1(Hy/Hx)
14
??? ???
  • ???, ????, ???? ?? ????
  • ??? ??? ??? ??? ????.

15
???? Magnetic Exploration
?? ???? ???? ?? ?? ??? ???? ?? ??????
????? ???? ???? ???? ???
? ?? ?? ??


16
3) ?? ???? ??? ?????
1. ?? ?? a. ??? (90)
b. ??? ?? 2. ?? ?? ? ??
a. ???(ionosphere) b. ???( magnetosphere)
magnetosphere
http//nssdc.gsfc.nasa.gov/space/model/models/igrf
.html
17
???? ???? ?? - ??????
????? ???? ??? ?????,?? ???
(self exciting dynamo)
?? ??? ?? 1) ???? ?? 2) disk rotating? ???? ??
???? ??? ??
copper disk
Rotation
magnetic field
electrical current
18
4) ?????? ??? ??????
Secular(????) ??? ?? ??? ??? ??? ????
geomagnetic field? ?? - originating in the
Earths core Diurnal(???) ? ??? ???? ????
geomagnetic field? ?? - Caused by Earth rotation
and solar wind. Magnetic storms(????) ?????
???? ? ??? magnetic disturbances (gt 1000 nT) -
are correlated with sunspot activity.
19
??? ???
  • ????? ??? ???? ???? ???? ??? ??? ??? ??? ????
  • ??? ??????? ??? ??????? ??? ???? ?? ? ?? ? ???
    ??????
  • ?? ?????? Magnetic Source? ????. ? ????

20
??? ?? ??? ???
Variation of geomagnetic total intensity for the
last 400 years.
21
??? ?? ??? ?? ?? ??? ??
?? (magnetic poles) ??? 90?? ??
??,
??
22
??? ???
  • ??? ??? ??? ????
  • ??(?????)? ??? ???? ??? ?????

23
6) ?? ????? ????-????(Paleomagnetism)
?? ??? ???? ?? 1) ??? ???? ?? ?? -?? ???
?? 2) ??, ??? ?? ?? ???
24
??? ???
  • ?? ????? ????? ??? ?? ?? ???? ??? ??? ??
  • ???? ??? ??? ???? ???? ??? ???. ? ?????
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