Airborne magnetic data covering the Evans, and Rutford Ice Streams, and ice rises in the Ronne Ice Shelf (2006/07)

• Main Authors: Ferraccioli, Fausto, Jordan, Tom
• Format: Dataset
• Language: English
• Published: UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation 2020
• Subjects: "EARTH SCIENCE","SOLID EARTH","GEOMAGNETISM","MAGNETIC ANOMALIES"; "EARTH SCIENCE","CRYOSPHERE","GLACIERS/ICE SHEETS"; Aerogeophysics; Aeromagnetics; Antarctica; Evans Ice Stream; Noice; Ronne Ice Shelf; Rutford; Antarc*; Ice Shelf
• Online Access: https://dx.doi.org/10.5285/7504be9b-93ba-44af-a17f-00c84554b819; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01350

An airborne radar survey was flown as part of the GRADES-IMAGE project funded by BAS over the Evans Ice stream/Carson Inlet region mainly to image englacial layers and bedrock topography during the 2006/07 field season. Aeromagnetic data were also opportunistically collected. We present here the processed line aeromagnetic data collected using scintrex cesium magnetometers mounted on the BAS aerogeophysical equipped Twin Otter. Data are provided as XYZ ASCII line data. : The dataset available here includes all channels from raw through to levelled, and microlevelled products. Channel naming follows SCAR/ADMAP2 data release protocols, although the order of processing steps differs from that outlined by ADMAP2 documentation. Magnetic data channels and processing flow: MagR- Raw magnetic total field intensity data (nT). MagC- Raw magnetic data corrected/cleaned for obvious tip tank events or anomalous spikes. TCorr- Tiptank corrections (nT). These include DC shifts and gradients due to aircraft noice, etc. Dummy values if not applicable. RefField- Geomagnetic reference field value for which the magnetic data has been compensated. IGRF model 2000 as implemented in Geosoft (nT). MagRTC- Compensated magnetic value adjusted for tip tanks and the geomagnetic reference field. BCorr- Low pass filtered (30 minute) magnetic base station correction. MagBRTC- calculated as MagBRTC= MagBTC- RefField. SCorr- Any DC shift applied. ACorr- MagRT filtered using a low pass filter with a cut-off length of 15 fiducials to account for noise introduced by aircraft roll, pitch and yaw. MagF- Final mag value before levelling. MagL- Statistically levelled mag data. MagML- Microlevelled magnetic data following technique of (Ferraccioli et al., 1998). Note tie lines are not included in the microlevelled data channel. Basic channel description: Line name Line Number Flight ID Sequential flight number x x projected meters* y y projected meters* Lon Longitude WGS 1984, Lat Latitude WGS 1984, Height_WGS1984 Aircraft altitude (meters) in WGS 1984, Date Date of flight in time format e.g. 2006/01/08 Time Time (UTC) of flight e.g. 23:52:42.0 *Projected coordinates (x and y) are in Polar stereographic (GRS 1980) defined as follows: Latitude of natural origin: -71 Longitude of natural origin: 0 Scale factor at natural origin -75.33333333333 False easting 0 False northing 2082760.109