Description of the MIRACLE quicklook plots
The MIRACLE quicklook plots consist of six panels:
- 1) The local AE index which is based on IMAGE
recordings and derived similarly to the global AE index. A statistical study (Kauristie et al., Ann. Geo. 14, pp. 1177, 1996)
shows that the local index (AL) is close to the global one during
- 2) Bx (north component) magnetograms of 8
IMAGE stations (at geogr. latitudes 65-79N and longitudes 12-27E). The
magnetograms show the variation field. Baseline levels have been
chosen from data around 0600 UT.
- 3) ASC keograms
and electrojet boundary locations. The keograms show the
auroral intensity along the middle meridian of the Kilpisjärvi
ASC (at 69.02N, 20.79E). When available, also the keogram from
Longyearbyen (78.20N, 15.70E) is displayed above the KIL keogram. The keograms show the
occurence of activity but further interpretation
is not straightforward. If you want to make more detailed analysis,
please, contact Kirsti Kauristie for
the original all-sky images.
The provisional electrojet boundary locations are based on latitude
profiles of Bx variations along the middle meridian of
IMAGE. This method is suitable only for quicklook purposes (ignores
longitudinal variations and FACs). To get a better view on
the current system, extract the magnetograms from the IMAGE
- 4) Range-Time-Intensity (RTI) plot of STARE shows the intensity of
backscatter along the beam 4 of the Norwegian radar. The beam is divided
in 50 range gates which correspond to distances of 495-1245 km
(along the beam) from the radar (check the map). Intensities >3
dB are above the background noise level. For more details, see the help page of RTI-plots.
- 5) East component of the electron velocity which is derived from the merged data of the two radars. If only one radar was operating this panels shows the line-of-sight velocity along the beam 4 of the radar.
- 6) North component of the electron velocity which is derived from the merged data of the two radars. This panel is empty if both radars were not operating.
Due to data gaps we cannot always strictly follow the above given format (e.g. in panel 3 Kilpisjärvi may be replaced with another ASC-station or in panels 4-6 beam 4 may be replaced with another beam). So, please, always check the legends of the plots!
More information: Kirsti Kauristie