Further by downloading this data the user acknowledges that they agree with the NERC data policy (), and the following conditions:

1. To cite the data in any publication as follows:

Jordan, T., & Ferraccioli, F. (2020). Processed line aeromagnetic data over Adelaide Island (2011) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/CECA9A1E-7E8D-45B8-8D58-FD3625A54DA7

2. The user recognizes the limitations of data. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data.

Methodology:

Adelaide Island aeromagnetic data is split into two datasets: One survey over the Fuchs Ice Piedmont and a High Resolution Aeromagnetic (HRAM) survey over the Wright Peninsula and Princess Royal Range. Aeromagnetic data are presented in Jordan et al. (2014) and datasets available here include all channels from raw through to levelled, and microlevelled products. Channel naming follows SCAR/ADMAP2 data release protocols. It should be noted that in the Fuchs magnetic database, channels are sorted by x coordinates ascending.

Note in the database split by line the sections are defined as follows L= main survey grid lines, T=main survey tie lines.

Magnetic data channels and processing flow for HRAM low and high cap surveys:

MagR- Raw magnetic total field intensity data (nT).

MagC- Compensated, or low pass filtered magnetic data (nT). Adjustments to compensate for aircraft roll, pitch and yaw were applied (see Ferraccioli et al, 2007 for details). For this survey, both compensation, and low pass filtering of MagR were used.

TCorr- Manual corrections made to account for tip tank events, data spikes etc.

RefField- Geomagnetic reference field value for which the magnetic data has been compensated. IGRF model 2010 as implemented in Geosoft (nT).

MagRTC- Compensated magnetic value adjusted for Tip tanks (where used) and geomagnetic reference field values (nT). MagRTC= MagR- RefField.

BCorr- Low pass filtered (60 minute) magnetic base station correction (nT).

MagBRTC- calculated as MagBRTC= MagRTC- Bcorr (nT).

ACorr- Additional correction applied to compensate for heading errors.

MagF- Final mag value before levelling (nT).

MagL- Statistically levelled mag data (nT).

MagML- Microlevelled magnetic data following technique of (Ferraccioli et al., 1998) (nT). Note tie lines are not included in the microlevelled data channel.

Magnetic data channels and processing flow for Fuchs survey:

MagR- Raw magnetic total field intensity data (nT).

TCorr- Manual corrections made to account for tip tank events, data spikes etc.

RefField- Geomagnetic reference field value for which the magnetic data has been compensated. IGRF model 2010 as implemented in Geosoft (nT).

MagRT- Compensated magnetic value adjusted for Tip tanks (where used) and geomagnetic reference field values. (nT) MagRTC= MagR- RefField.

BCorr- Low pass filtered (60 minute) magnetic base station correction.

MagBRT- calculated as MagBRT= MagRT- Bcorr (nT).

ACorr- Additional correction applied to compensate for low amplitude, high frequency remnant noise in the data. A high-pass filter with a cutoff wavelength of 15 fiducials was used.

MagF- Final mag value before levelling (nT).

MagL- Statistically levelled mag data (nT).

MagML- Microlevelled magnetic data following technique of (Ferraccioli et al., 1998) (nT). Note tie lines are not included in the microlevelled data channel.

Basic Channels

Line_no 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 Lambert conic conformal with two standard parallels defined as follows:

Latitude of false origin: -74.018118

Longitude of false origin: 179

Latitude of 1st standard parallel -72.66666666667

Latitude of 2nd standard parallel -75.33333333333

False easting 1444000

False northing 1123000

Data collection:

Data collection times:

Fuchs: 16/01/2011 - 23/06/2011

HRAM HighCap: 04/02/2011 - 20/02/2011

HRAM - LowCap: 05/02/2011 - 17/02/2011

Data quality:

Fully levelled aeromagnetic data product, including base station correction, statistical and microlevelling.

Fuchs survey has 1 km line spacing.

HRAM has 500m line spacing.

No values for Scorr.