Magnetospheric-Ionospheric-Gound Induced Current model - Geoelectric Field¶
The MA.I.GIC. model is based on the equation which describes a possible disturbance in the magnetospheric-ionospheric system propagating vertically downward from the ionosphere as plane waves. In this scenario, the Earth is assumed as uniform (or a layered) half-space conductor with conductivity in which the magnetic field (B) is obtained from ground magnetometer observatories and the impedance Z is obtained considering the corresponding local conductivity. To evaluate the conductivity, the global model by Alekseev et al. (2015), which provides the Earth’s conductivity on a series of 0.25 × 0.25 degrees grid spherical layers covering a depth range of 0–100 km, is considered. So the geoelectric field (E) is evaluated. To discriminate between ionospheric and magnetospheric origin contribution, the ground geomagnetic field observations are first decomposed into several Intrinsic Mode Components (IMCs), which are oscillating functions modulated in both amplitude and frequency, using Fast Iterative Filtering . Then, in order to analyze the physical meaning of each IMC and connect them to the timescales involved in the magnetospheric and ionospheric origin fields, we used a statistical test, which allows to evaluate clear timescale separation in a certain data set.
References¶
Dataset summary¶
internal_name: |
uniaq_field_maigic_tableset |
publisher: |
Mirko Piersanti |
alph_code: |
41B |
id_tmp: |
87 |
short_name: |
MA.I.GIC. Geoelectric Field |
identifier: |
aspis:///univaq/field_maigic_tableset |
dynamic: |
Static and depending on the length of the input data |
size: |
5MB |
format: |
.mat |
type: |
tableset |
records_number: |
8641 |
time_start: |
2021-04-12 |
time_stop: |
2021-04-13 |
spatial: |
GEOMAG |
messenger: |
Electric Field |
spectral_min: |
0 |
spectral_max: |
0 |
spectral_units: |
0 |
observable: |
{GIC,GEOINDEX} |
latest update: |
2024-03-28 05:08:14 |
Columns specification¶
progr |
column |
units |
type |
description |
|---|---|---|---|---|
1 |
time |
UTC |
datetime |
Time (2022-09-14T03:00:03) - UTC Time |
2 |
GEI_lon |
deg |
float |
Geographic Longitude (deg) |
3 |
GEI_lat |
deg |
float |
Geographic Latitude (deg) |
4 |
year |
year |
int |
no description |
5 |
month |
month |
int |
no description |
6 |
day |
day |
int |
no description |
7 |
hour |
hour |
int |
no description |
8 |
min |
min |
int |
no description |
9 |
sec |
sec |
int |
no description |
10 |
HF_component |
nT |
float |
the high-frequency contribution (nT) |
11 |
Iono_component |
nT |
float |
the ionospheric contribution (nT) |
12 |
Magn_component |
nT |
float |
the magnetospheric contribution (nT) |