3 rd MagNetE Workshop on European Geomagnetic Repeat Station Survey

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Bucharest, 14-16 May 2007

Josef Berger, Gerald Duma, Barbara LeichterCentral Institute for Meteorology and Geodynamics

Vienna, Austria

REPEAT STATION MEASUREMENTS IN AUSTRIA

2005 AND 2006

3rd MagNetE Workshopon European Geomagnetic Repeat Station Survey

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The repeat station network in Austria

14 RS measured every year since 1999 Since 2001 marked with limestones

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Measurement-/Processing- Practice

Measurement sets 1995-2004: One set of 4-5 measurements 2005: One set in the evening and in the morning

Quality control Standard deviation SD of 4-5 results (1 set) Removal of data: dev >> SD (D – 30“, I – 20“,

H – 5nT)

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Standard deviation (in sec) – reduction THY

2003 2004 2005D_THY I_THY D_THY I_THY D_THY D_THY D_THY I_THY I_THY I_THY

e + m e m e + m e m 606 Aschau 3 3 5 1 5 4 4 3 1 1 95 Attersee 5 1 11 1 10 4 13 4 1 6 112 Ehrwald 18 1 2 1 5 5 4 4 199 Jedenspeigen 26 14 4 3 3 5 12 10 191 Klaffer 4 7 16 1 6 5 4 5 6 1 134 Krimml 4 1 12 3 6 3 4 11 0 2 604 Lampersberg 9 4 5 2 4 2 5 11 9 1 605 Mollitsch 8 6 7 2 16 17 9 8 9 3 322 Nenzinger Himmel 15 11 10 2 17 4 23 2 2 1 4 Rekawinkel 6 7 4 10 7 10 3 8 1 6 607 Saass 8 3 15 5 7 8 4 5 2 2151 Scheibbs 7 1 5 1 9 6 8 6 2 2 602 St. Johann a.Tauern 26 7 6 1 9 3 12 7 1 1 608 Trafelberg 4 1 10 3 2 3 1 1

Mean value SD 10,69 5,08 7,57 2,43 8,14 5,75 7,21 6,36 2,92 2,93

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Standard deviation (nT) – reduction THY

2003 2004 2005H_THY H_THY H_THY H_THY H_THY

e+m e m 606 Aschau 0,5 0,2 0,8 0,2 0,2 95 Attersee 0,3 0,1 0,9 0,1 1,2 112 Ehrwald 0,2 0,3 0,7 0,7 199 Jedenspeigen 2,4 0,7 2,7 3,1 191 Klaffer 1,4 0,2 1 1,3 0,1 134 Krimml 0,3 0,5 2,4 0,1 0,4 604 Lampersberg 0,9 0,3 3 1,9 0,2 605 Mollitsch 1,2 0,3 1,5 2 0,6 322 Nenzinger Himmel 2,3 0,4 1 0,5 0,1 4 Rekaw inkel 1,6 2,2 2 0,3 1,2 607 Saass 0,6 1 1,2 0,4 0,4151 Scheibbs 0,2 0,2 1,4 0,3 0,3 602 St. Johann a.Tauern 1,2 0,3 2,2 0,2 0,1 608 Trafelberg 0,3 0,4 0,3 0,2

Mean value 1,01 0,50 1,51 0,63 0,63

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Max. differences of e- and m- measurement sets

D: 30 sec I: 20 sec HZF: 5 nT

much bigger than scatter in single e- or m-set

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Reduction to different observatories

Differences in D (min): WIK-BDV 2004

17.0

17.0

17.0

17.0

10.0

10.0

10.0

10.010.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0

10.0 11.0 12 .0 13.0 14.0 15.0 16.0 17.0

46.0

47.0

48.0

49.0

46.0

47.0

48.0

49.049.0 49.0 49.0 49.0 49.0 49.0 49.0 49.0

46.0 46.0 46 .0 46.0 46.0 46.0 46.0 46.0

ADM O NT

A M ST ETTEN

BADEN

BA DG AST EIN

BAD ISC HL

B ISCHO FSHO FEN

B LUD ENZ

BREG EN Z

B RU CK/M UR

EISE NSTADT

E NNS

FREISTADT

G M UNDEN

GR AZ

HAIN BUR G

HO RN

IN NSBRU CK

JEN BACH

JUDENB URG

KINDBER GKITZBUE HEL

KLA GE NFU RT

K REM S

KRIM M L

KUFS TEIN

LA ND ECK

LIENZ

LILIEN FELD

LINZ

LO FER

M AR IAZE LL

M ATREI

M IST ELBACH

M URAU

NEUS IEDL

PINK AFELD

RAD K ERSB URG

RET Z

RE UTTE

RIED

S ALZBU RG

ST .P O ELTEN

ST .VE IT /G LAN

SC HA ERD IN G

S CH EIBBS

SCHLADM ING

SEM M ERING

S OE LDEN

SPITTA L/DR AU

S TEYR

TAM S W EG

VILLA CH

W E IZ

W E LS

W EYE R W R .N EUSTADT

W INDISCH G ARSTEN

W O LF SB ERG

ZE LL/SE E

ZW ETTL

FUERS TEN FE LD

W IEN

R eka

A tte

Ehrw

Krim

Sche

K laf

Jede

Nenz

S tJo

Lam p M oll

Asch

S tPe

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Reduction to different observatories

Differences in F-values: WIK-FUR 2004

17.0

17.0

17.0

17.0

10.0

10.0

10.0

10.010.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0

10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0

46.0

47.0

48.0

49.0

46.0

47.0

48.0

49.049.0 49.0 49.0 49.0 49.0 49.0 49.0 49.0

46.0 46.0 46.0 46.0 46.0 46.0 46.0 46.0

ADM O NT

AM STETTEN

BADE N

BADG ASTEIN

BAD ISCHL

BISC HO FSHO FEN

BLUDEN Z

BR EG ENZ

BRUCK/M UR

EISENSTAD T

EN NS

FREISTADT

GM UNDEN

GRAZ

HAINBURG

HO RN

INNSBRUCK

JENBACH

JUDENBUR G

KIND BER GKITZBU EH EL

KLAG EN FU RT

KREM S

KRIM ML

KUFSTEIN

LAND ECK

LIENZ

LILIENFELD

LINZ

LO FER

M ARIAZE LL

M ATREI

M ISTELBACH

M URAU

NEUSIEDL

PINKAFELD

RADKERSBURG

RETZ

REUTTE

RIED

SALZBURG

ST .PO ELTEN

ST .VEIT/G LAN

SC HAERD ING

SCHEIBBS

SC HLAD M ING

SEM M ERIN G

SO ELDEN

SPITTAL/DR AU

STEYR

TAM SW EG

VILLACH

W EIZ

W ELS

W EYER W R.N EU STADT

W IND IS CH G ARSTEN

W O LFSBERG

ZELL/SEE

ZW ETTL

FUERSTENFELD

W IEN

Reka

A tte

Ehrw

K rim

Sche

K la f

Jede

Nenz

S tJo

Lam p M oll

Asch

S tPe

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2005 - Reference Observatory THY

2005 Reduction epoch 2005. 5 –THY

preliminary Austrian data Usage of data upon request to ZAMG ST-No ST-NAME LAT LONG ELEV [m] D[min] I[deg] H Z F

606 Aschau 47,4208 16,2009 609 172,55 63,806 21173,9 43041,7 47968,6 95 Attersee 47,8983 13,5281 500 124,43 64,1646 20906,5 43178,2 47973,3 112 Ehrwald 47,4136 10,9205 1041 85,42 63,4765 21294,8 42665,6 47685,2 199 Jedenspeigen 48,4939 16,8586 182 170,37 64,6836 20722,7 43806,1 48460,7 191 Klaffer 48,7001 13,8571 646 126,42 64,7679 20557,0 43621,8 48222,9 134 Krimml 47,2354 12,2033 974 107,55 63,3539 21401,4 42650,7 47719,6 604 Lampersberg 46,8154 13,3962 990 119,58 63,0773 21600,8 42534,3 47705,0 605 Mollitsch 46,8407 15,4373 401 151,43 63,2179 21543,5 42680,8 47809,9 322 Nenzinger Himmel 47,0863 9,6425 1366 65,35 63,1136 21485,6 42374,4 47510,1 4 Rekawinkel 48,1842 16,0291 408 164,77 64,4105 20848,3 43533,7 48269,0 607 Saass 48,9730 15,0785 624 159,60 65,0629 20390,8 43853,5 48362,9 151 Scheibbs 48,0236 15,1731 522 149,07 64,2863 20893,4 43386,1 48155,2 602 St, Johann a,Tauern 47,3533 14,4814 1228 134,23 63,5859 21315,0 42911,4 47914,4 608 Trafelberg 47,9270 15,8628 1096 156,85 64,2089 20957,1 43368,6 48167,1 1 WIK 48,2656 16,3183 400 - - - - - 404 FUR 48,1656 11,2767 572 89,70 64,1967 20875,0 43190,0 47974,0 405 HRB 47,8747 18,1900 120 187,20 64,2367 20955,0 43482,0 48282,0 417 BDV 49,0676 14,0170 496 132,90 65,1383 20311,0 43866,0 48346,0 420 THY 46,9006 17,8933 187 180,30 63,4183 21445,0 42916,0 47989,0 421 NCK 47,6339 16,7167 160 - - - - -

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2006 - not reduced yet!

2006 Reduction epoch 2006.5 - WIK Date of

occupation ST-No ST-NAME LAT LONG ELEV [m] D[min]

606 Aschau 47,4208 16,2009 609 28.- 29.8.2006 95 Attersee 47,8983 13,5281 500 27.- 28.9.2006 112 Ehrwald 47,4136 10,9205 1041 03.- 04.10.2006 199 Jedenspeigen 48,4939 16,8586 182 07.- 08.9.2006 191 Klaffer 48,7001 13,8571 646 28.- 29.9.2006 134 Krimml 47,2354 12,2033 974 02.-0 3.10.2006 604 Lampersberg 46,8154 13,3962 990 31.8.- 1.9.2006 605 Mollitsch 46,8407 15,4373 401 18.- 19.9.2006 322 Nenzinger Himmel 47,0863 9,6425 1366 04.-05.10.2006

4 Rekawinkel 48,1842 16,0291 408 13.-14.9.2006 607 Saass 48,9730 15,0785 624 12.- 13.10.2006 151 Scheibbs 48,0236 15,1731 522 29.- 30.8.2006 602 St.Johann a\Tauern 47,3533 14,4814 1228 05.- 6.9.2006 608 Trafelberg 47,9270 15,8628 1096 12.-13.9.2006

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The average secular variation in Austria 2000 - 2004

Average of 5 observatories (without WIK) Average of 14 repeat stations

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The average secular variation in Austria 2000 - 2004

Average of 5 observatories Average of 14 repeat stations

2000.0 2001.0 2002.0 2003.0 2004.00

2

4

6

8

10

SV -

14 re

peat

sta

tions

(min

/yr)

0

2

4

6

8

10

SV -

5 ob

serv

ator

ies

(min

/yr)D

2000.0 2001.0 2002.0 2003.0 2004.0-20

-10

0

10

20

SV -

14 re

peat

sta

tions

(nT/

yr)

-20

-10

0

10

20

SV -

5 ob

serv

ator

ies

(nT/

yr)

H

2000.0 2001.0 2002.0 2003.0 2004.0

20

30

40

50

60

SV -

14 re

peat

sta

tions

(nT/

yr)

20

30

40

50

60

SV -

5 ob

serv

ator

ies

(nT/

yr)

Z

2000.0 2001.0 2002.0 2003.0 2004.020

30

40

50

60SV

- 14

repe

at s

tatio

ns (n

T/yr

)

20

30

40

50

60

SV -

5 ob

serv

ator

ies

(nT/

yr)

F

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Results Practice of evening and morning measurements SD of e-set and m-set measurements similar SD of e+m-measurements bigger (2x) SD depends on magnetic disturbances Reduction to different observatories Max. differences of station value: WIK-OBS D: 2 min I: 0.8 min H,Z,F: 10 nT (near SV)

compare Newitt,Barton, Bitterly (1996): D:1min, I:0.5min HZF: 5nT on average Differences change from year to year for same reference

observatory (more or less abitrary) On average: differences WIK-THY smaller Stay with the same reference observatory ( for “final RS data“)

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To quote Newitt, Barton, Bitterly (1996)

„A determination of the error in a repeat station observation is an important but often difficult

exercise“CH.6.3

We fully agree!

Thank you for your attention !

3 rd MagNetE Workshop on European Geomagnetic Repeat Station Survey

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