Abstract
AbstractAs a frequent phenomenon occurring during summer days in high‐latitude ionosphere, the F‐lacuna manifests itself as disappearance of F region ionogram traces. Based on the 7.5 min interval Digisonde ionograms recorded at Zhongshan station (69.4°S, 76.4°E geographic coordinates; 74.5°S, 96.0°E corrected geomagnetic coordinates), we present temporal characteristics of the F‐lacuna, as well as its correlation with geomagnetic activity, interplanetary magnetic field, and colocated TEC. Magnetic Local Time (MLT) distribution of the F‐lacuna occurrence exhibits a dawn‐dusk asymmetry. All types of F‐lacuna favor the dawn sector, mainly occurring at 08:00–11:00MLT for F1 and total lacuna, 6:00–8:00MLT for F2‐lacuna. The magnetic activity is found to have a strong positive correlation with the F2 and total lacuna. F2‐lacuna occurrence is favored by southward component of interplanetary magnetic field (IMF), and total lacuna by high values of either eastward or westward component. It is worth to mention that the F‐lacuna associates with the simultaneous total electron content (TEC) condition which has a positive correlation with F1‐lacuna occurrence, while a strong negative correlation with the F2 and total lacuna. The associated TEC variation may provide a significant evidence for interpreting the F‐lacuna phenomenon.
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