Classifier Instance:

Anchor text: Iridium
Target Entity: Iridium_satellite_constellation
Preceding Context: Radio wave in the HF band (3 to 30 MHz) (also known as the shortwave band) are bent so much by the ionosphere that they are reflected back in the same manner as a mirror reflects light. Since the ground also reflects HF wave, a signal can be transmitted around the curvature of the Earth to a distant station. During the 20th century, HF communications was the only method for a ship or aircraft far from land or a base station to communicate. With the advent of systems such as
Succeeding Context: , there are now other methods of communications but HF is still considered to be critical because not all vessels carry the newer equipment and even if the newer equipment is onboard, HF is considered a critical backup system. Space weather events can create irregularities in the ionosphere that scatter HF signals instead of reflecting them and make HF communications over long distance poor or impossible. At auroral and polar latitudes, small space weather events which occur frequently disrupt HF communications. At mid-latitudes, HF communications are disrupted by solar radio bursts, by X-rays from solar flares (which enhance and disturb the ionospheric D-layer) and by TEC enhancements and irregularities during major geomagnetic storms which are infrequent.
Paragraph Title: Disruption of long-distance radio signals
Source Page: Space weather

Ground Truth Types:

|---wordnet_entity_100001740
| |---wordnet_entity_100001740_rest

Predicted Types:

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