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Port Stanley Observatory Monthly Magnetic Bulletin February 2008 08/02/PS

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Port Stanley Observatory Monthly Magnetic Bulletin February 2008 08/02/PS BRITISH GEOLOGICAL SURVEY Port Stanley Observatory Monthly Magnetic Bulletin February 2008 08/02/PS Jason Islands cass Island Cara West Falkland SaundersKeppel Island Island Kin g George Bay Mount Port Salavador Adam Queen Charlotte Bay Mount Osborne Berkley 700m Sapper Hill Sound 705m Weddell Darwin Stanley Goose Island kland Sound Choiseul Fal Green Sound Port Stephens Bay of East Falkland Harbours Eagl e Passage Falkland Islands ©Crown copyright; Ordnance Survey PORT STANLEY OBSERVATORY MAGNETIC DATA 1. Introduction perpendicular to these, and measures variations, which are proportional to the changes in declination (D). Port Stanley Observatory was installed by BGS with Measurements are made at a rate of 1 Hz. financial support from a consortium of oil companies and became operational in February 1994. In addition to the fluxgate sensors there is a proton precession magnetometer making measurements of the This bulletin is published to meet the needs of users of absolute total field intensity (F) at a rate of 0.1Hz. geomagnetic data. Magnetic observatory data is presented as a series of plots of one-minute, hourly The raw unfiltered data are retrieved automatically via and daily values, followed by a tabulation of monthly Internet connections to the BGS office in Edinburgh in values. The operation of the observatory and near real-time. The fluxgate data are filtered to presentation of data are described in the rest of this produce one-minute values using a 61-point cosine section. filter whilst the total field intensity samples are filtered using a 7-point cosine filter. Enquiries about the data should be addressed to: 3.2 Absolute Observations National Geomagnetic Service The GDAS fluxgate magnetometers accurately British Geological Survey measure variations in the components of the Murchison House, West Mains Road geomagnetic field, but not the absolute magnitudes. Edinburgh EH9 3LA Two sets of absolute measurements of the field are Scotland, UK made manually once per week. A fluxgate sensor mounted on a theodolite is used to determine D and Tel: +44 (0) 131 667 1000 inclination (I); the GDAS PPM measurements, with a Fax: +44 (0) 131 650 0265 site difference correction applied, are used for F. The E-mail: [email protected] absolute observations are used in conjunction with the Internet: www.geomag.bgs.ac.uk GDAS variometer measurements to produce a continuous record of the absolute values of the 2. Position geomagnetic field elements as if they had been measured at the observatory reference pillar. Port Stanley Observatory, one of the geomagnetic observatories maintained and operated by the British 4. Data Presentation Geological Survey (BGS), is situated on a site at The data presented in the bulletin are in the form of Sapper Hill near Port Stanley in the Falkland Islands. plots and tabulations described in the following The observatory co-ordinates are: sections. Geographic: 51° 42.2′ S 302° 06.6′ E 4.1 Absolute Observations Geomagnetic: 41° 41.1′ S 11° 27.2′ E The absolute observation measurements made during Height above mean sea level: 135 m the month are tabulated. Also included are the corresponding baseline values, which are the The geomagnetic co-ordinates are calculated using the differences between the absolute measurements and 10th generation International Geomagnetic Reference the variometer measurements of D, H and Z (in the Field at epoch 2008.5. sense absolute−variometer). These are also plotted (markers) along with the derived preliminary daily 3. The Observatory Operation baseline values (line) throughout the year. Daily mean differences between the measured absolute F and the 3.1 GDAS F computed from the baseline corrected H and Z The observatory operates under the control of the values are plotted in the fourth panel (in the sense Geomagnetic Data Acquisition System (GDAS), measured−derived). The bottom panel shows the developed by BGS, which was installed in August daily mean temperature in the fluxgate chamber. 2002. The system operates under the control of data acquisition software running on QNX computers, 4.2 Summary magnetograms which control the data logging and communications. Small-scale magnetograms are plotted which allow the month's data to be viewed at a glance. They are plotted There are two sets of sensors used for making 16 days a page and show the variations in D, H and Z. magnetic measurements. A triaxial linear-core fluxgate The scales are shown on the right-hand side of the magnetometer, manufactured by the Danish page. On disturbed days the scales are multiplied by a Meteorological Institute, is used to measure the factor, which is indicated above the panel for that day. variations in the horizontal (H) and vertical (Z) The variations are centred on the monthly mean value, components of the field. The third sensor is oriented shown on the left side of the page. 4.3 Magnetograms The daily magnetograms are plotted using one-minute values of D, H and Z from the fluxgate sensors, with any gaps filled using back-up data. The magnetograms are plotted to a variable scale; scale bars are shown to the right of each plot. The absolute level (the monthly mean value) is indicated on the left side of the plots. 4.4 Hourly Mean Value Plots Hourly mean values of D, H and Z for the past 12 months are plotted in 27-day segments corresponding to the Bartels solar rotation number. Magnetic disturbances associated with active regions on the surface of the Sun may recur after 27 days: the same is true for geomagnetically quiet intervals. Plotting the data in this way highlights this recurrence, and also illustrates seasonal and diurnal variations throughout the year. 4.5 Daily and Monthly Mean Values Daily mean values of D, H, Z and F are plotted throughout the year. In addition, a table of monthly mean values of all the geomagnetic elements is provided. These values depend on accurate specification of the fluxgate sensor baselines. This data is provisional. It is anticipated that provisional values will not be altered by more than a few nT or tenths of arcminutes before being made definitive. © NERC 2008 PORT STANLEY OBSERVATORY ABSOLUTE OBSERVATIONS DECLINATION INCLINATION Total H H Z Z Day Time Absolute Baseline Time Inclination Field Date Absolute Baseline Absolute Baseline Observer Number (UT) (º) (º) (UT) (º) Intensity (nT) (nT) (nT) (nT) (nT) 09-Feb-08 40 16:12 3.6504 3.5850 16:18 -49.2448 28883.9 18856.3 18874.1 -21879.7 -21779.1 NB 09-Feb-08 40 16:24 3.6702 3.5933 16:29 -49.2282 28884.1 18862.7 18878.6 -21874.4 -21775.2 NB 24-Feb-08 55 19:12 3.6439 3.5700 19:19 -49.2203 28886.0 18867.0 18866.0 -21873.3 -21787.7 NB 24-Feb-08 55 19:27 3.6443 3.5717 19:36 -49.2142 28887.1 18870.0 18866.0 -21872.1 -21787.6 NB Falkland Island 2008 Declination : Absolute - Variometer (markers) and Baseline Applied (line) 215.6 5min Horizontal Intensity : Absolute - Variometer (markers) and Baseline Applied (line) 18867 20nT Vertical Intensity : Absolute - Variometer (markers) and Baseline Applied (line) -21782 20nT Total Intensity : Absolute (Proton F) - Baseline Adjusted Variometer (derived F) 25.0 20nT Temperature Inside Variometer Hut 22.6 20 C Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Falkland Islands February 2008 1 2 3 4 o D 3.57 0.50 H 18861 Z -21875 5 6 7 8 D 3.57 H 18861 150 nT Z -21875 9 10 11 12 D 3.57 H 18861 Z -21875 150 nT 13 14 15 16 D 3.57 H 18861 Z -21875 6 12 18 24 6 12 18 24 6 12 18 24 6 12 18 24 17 18 19 20 o D 3.57 0.50 H 18861 Z -21875 21 22 23 24 D 3.57 H 18861 150 nT Z -21875 25 26 27 28 D 3.57 H 18861 Z -21875 150 nT 29 6 12 18 24 6 12 18 24 6 12 18 24 UT UT UT D 3.57 H 18861 Z -21875 6 12 18 24 Falkland Islands February 2008 Date: 01-02-2008Falkland Islands Day number: 032 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 30nT Vertical Intensity in nT -21875 30nT 0 3 6 9 12 15 18 21 24 Date: 02-02-2008 Day number: 033 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 30nT Vertical Intensity in nT -21875 20nT 0 3 6 9 12 15 18 21 24 Hour (UT) Date: 03-02-2008Falkland Islands Day number: 034 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 20nT Vertical Intensity in nT -21875 20nT 0 3 6 9 12 15 18 21 24 Date: 04-02-2008 Day number: 035 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 20nT Vertical Intensity in nT -21875 10nT 0 3 6 9 12 15 18 21 24 Hour (UT) Date: 05-02-2008Falkland Islands Day number: 036 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 10nT Vertical Intensity in nT -21875 10nT 0 3 6 9 12 15 18 21 24 Date: 06-02-2008 Day number: 037 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 20nT Vertical Intensity in nT -21875 10nT 0 3 6 9 12 15 18 21 24 Hour (UT) Date: 07-02-2008Falkland Islands Day number: 038 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 20nT Vertical Intensity in nT -21875 20nT 0 3 6 9 12 15 18 21 24 Date: 08-02-2008 Day number: 039 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 20nT Vertical Intensity in nT -21875 10nT 0 3 6 9 12 15 18 21 24 Hour (UT) Date: 09-02-2008Falkland Islands Day number: 040 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 20nT Vertical Intensity in nT -21875 20nT 0 3 6 9 12 15 18 21 24 Date: 10-02-2008 Day number: 041 Declination in degrees east 3.57 15min Horizontal Intensity in nT 18861 30nT Vertical Intensity in nT -21875 20nT 0 3 6 9 12 15 18 21 24 Hour (UT) Date: 11-02-2008Falkland Islands Day number: 042 Declination
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