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The Greenland coastal magnetometer chain and other research installations with DMI involvement

The Greenland coastal magnetometer chain and other research installations with DMI involvement J. Watermann, O. Rasmussen Atmosphere Space Research Division Danish Meteorological Institute Copenhagen, Denmark. UCB, SSL, Dec 2005. Greenland ground-based research facilities

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The Greenland coastal magnetometer chain and other research installations with DMI involvement

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  1. The Greenland coastal magnetometer chain and other research installations with DMI involvement J. Watermann, O. Rasmussen Atmosphere Space Research Division Danish Meteorological Institute Copenhagen, Denmark UCB, SSL, Dec 2005

  2. Greenland ground-based research facilities Dotted gridgeographic latitude and longitude Dashed lines corrected geomagnetic latitude (epoch 2000.0) Blue circlesDMI variometer stations Full circlesdata from preceding day are transmitted to DMI via modem and telephone line Open circlesdata are stored locally and sent to DMI via snail mail Dotted linebest-fit great circle, west coast stations Red circlesMAGIC sites (SPRL, Univ. of Michigan) Blue trianglesDMI geomagnetic observatories Blue diamondSondrestrom Research Facility Black Romandigisondes – mag data are being transmitted to DMI in near realtime Cyan full diamonds satellite radio beacon receivers (operated by ARL:UT) (PCN station) (AE station)

  3. DMI Greenland Magnetometers sensor type dual linear core tri-axial fluxgate with main field compensation gravity-controlled gimbal system at some stations axis misalignment < 2 mrad sensitivity 0.1 nT broadband noise (~DC – 1 Hz) long-term drift < 3 nT / year temperature drift < 0.2 nT / ºC (sensor) < 0.1 nT / ºC (electronics) temperature resolution 0.1 ºC sampling rate 20 s and 1 s (dual acquisition) acquisition digital, 16-bit signed integer final resolution 0.25 nT at 20-s sampling rate 0.125 nT at 1-s sampling rate time accuracy typically ±1 s, improvements under consideration (constraints on resources) delivery time east coast several months, west coast 1-2 months (unless telephone transmission) service interval site visit by DMI engineer once every ~5 years points of contact Jurgen Watermann (jfw@dmi.dk), Ole Rasmussen (or@dmi.dk)

  4. Greenland Magnetometer Array Web Pagehttp://www.dmi.dk/projects/chain/

  5. distribution of geomagnetic variations in three frequency bands at Greelandic and Danish geomagnetic observatories, Jan 01, 2003 – June 30, 2005

  6. distribution of geomagnetic variations in three frequency bands at Greelandic and Danish geomagnetic observatories, Jan 01, 2003 – June 30, 2005

  7. distribution of geomagnetic variations in three frequency bands at Greelandic and Danish geomagnetic observatories, Jan 01, 2003 – June 30, 2005

  8. mean ULF activity distribution along the Greenlandic west coast mean values from 294 quiet and moderately disturbed days (Dst > -100 nT)

  9. Magnetometer data availability • near real-time data from NAQ, STF, THL come at 1-min resolution • the most recent 20-s resolution data are from yesterday (except NAQ, STF, THL) • the most recent 1-s resolution data are usually several months old • historical data are freely available • real-time and near real-time data are more restricted and require special agreement • 1-min resolution observatory data are available the next day • (in compliance with INTERMAGNET standard requirements) • Operation conditions • Greenland variometer stations (except Kangerlussuaq and Qaanaq) • are operated under contract with external service providers • DMI’s future presence in Kellyville (Kangerlussuaq) is uncertain – NSF is in charge • installation and operation of instruments in Greenland requires • an appropriate budget to pay for routine service and extra expenses • the internet connections to NAQ and THL are paid for by the AFRL (digisondes) • DMI has the right to use excess capacity for magnetometer data transmission

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