Eötvös Loránd Geophysical Institute

founded in 1907

baron Loránd Eötvös (1848-1919)

torsion balance

Equivalence of inertial and gravitational mass up to 1:200 000 000 precision (1909)

Eötvös – unit

(gravitational gradient)

Eötvös – effect (1907)

Hydrocarbon exploration

„The most common torsion balance employed in the early hunt for oil in Texas was designed by Baron von Eoetvoes in Hungary„ (first success 1924)

Organisational stucture of ELGI

ELGI

Dept 1 Dept 2 Dept 3 Dept 6Physics of the Earth Dept 5

Gravity Geomagnetism Geothermal Science

Geomagnetism

Paleomagnetism

Space Research

Tihany Geophysical Observatory

ELGI:

~ 80 researchers

Earth Physics Departement:

7 researcher

1 technician

Space research at ELGI• 1. Observations (Tihany Geophys. Obs.)

– Geomagnetic observations (INTERMAGNET)– Observation of ULF waves (pulsations)– Coordination of MM100 magnetometer array– Observation of TRIMPIs (ELTE SRG)– Observation of VLF whistlers (ELTE SRG)

• 2. ULF research– Solar-wind driven upstream waves and

upstream wave related pulsations (UWs)– Field line resonances (FLRs)

• 3. Nonlinear phenomena in the solar wind and in the magnetosphere– Turbulence– Chaos– Hot Flow Anolamies, etc.

BIMF

vsw

θBx

vsw > vA

super-Alfvenic flow

k

Upstream source of dayside Pc3s

Upstream waves

reflected ions

Upstream waves• UW related geomagnetic

pulsations

– drivers of FLRs

– their relation to upstream SW/IMF parameters

• frequency ~ |Bimf|• occurrence ~ direction of Bimf,

Np, vsw

– first automated UW detection algorithm• ground-based• observations at LEO (CHAMP)

– first empirical model of UW related ground Pc3 activity

Global distribution of compressional Pc3 power at LEO (Heilig et al. 2007, AnnGeo)

Empirical model of UW related Pc3 activity (Heilig et al. 2010, AnnGeo)

Field line resonances– Semi-automated FLR detection (based on

Berube et al. JGR 2003)– Plasma mass density estimations (Schulz

JGR 1996)• Simple magnetic and plasma model

– Seasonal and solar cycle variation of plasma mass density

– Combining ULF-VLF methods

MM100 – quasimeridional magnetometer array

Initiated in 2001:

Coordinated observation of ULF waves

> 1 Hz magnetic data

MM100 stationsStation Start Intsrument Geograph. Geomag. McIllwain

name IAGA affiliation date type lat. long. lat. long. L-shell

Kilpisjärvi KIL IMAGE/FMI 09.2001 LEMI-004 69.02° 20.79° 66.10° 104.00° 6.09

Sodankylä SOD IMAGE/SGO 09.2001 PSM 67.37° 26.63° 64.16° 107.46° 5.26

Oulujärvi OUJ IMAGE/FMI 01.2004 FGE 64.52° 27.23° 61.23° 106.31° 4.32

Hankasalmi HAN IMAGE/FMI 09.2001 FGE 62.30° 26.65° 59.01° 104.78° 3.77

Nurmijärvi NUR IMAGE/FMI 09.2001 FGE 60.52° 24.65° 57.23° 102.34° 3.41

Tartu TAR IMAGE/FMI 09.2001 FGE 58.26° 26.46° 54.80° 103.04° 3.01

Suwalki SUW IGPAS 10.2007 PSM 8511-01P 54.01° 23.18° 50.34° 98.83° 2.45

Belsk BEL IGPAS 01.2003 PSM 8511-01P 51.83° 20.80° 48.01° 96.15° 2.23

Hurbanovo HRB IGSAS 09.2001 MAGSON 47.87° 18.18° 43.56° 92.86° 1.90

Nagycenk NCK ELGI 08.2000 NAROD S-100 47.63° 16.72° 43.27° 91.53° 1.89

Tihany THY ELGI 07.1999 NAROD S-100 46.90° 17.89° 42.44° 92.39° 1.84

Activities in PLASMON• ELGI

– Participates dominantly in WP2• Installation of 2 new ULF stations• Coordination of MM100 observations• Develop tools for FLR identification• Develop inversion methods• Cross calibration of ULF and VLF methods

– WP1: ELGI will host an AWDANet node az Tihany Geophysical Observatory

– WP3, WP4: by supplying plasma mass densities

– WP5: dissemination of the results