A magnetic dipole is a closed circulation of electric current.
2.
On September 28, satellite data and ships'observations indicated a closed circulation.
3.
Observations indicate the system did not acquire a closed circulation, thus preventing classification as a tropical cyclone.
4.
On July 31, it developed a closed circulation and became " Tropical Storm Erin ".
5.
Late on September 19, another reconnaissance plane discovered a closed circulation to the northwest of Grand Cayman.
6.
Due to the closed circulation of ecosystem, the wetland is claimed to face easy degradation and extinction.
7.
Early on May 25, a closed circulation consolidated off the coast of New England and the system stalled out.
8.
At midnight on the start of July 31, Hurricane Hunter aircraft data showed that the storm had acquired a closed circulation.
9.
On September 1, a Hurricane Hunter reconnaissance mission into the low found a closed circulation center and tropical storm-force winds.
10.
Persistent shear continued to take its toll on the cyclone as it entered the Caribbean Sea with aircraft data indicating no closed circulation at elevation.
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