### Question
How is the term GMD defined?


### Answer
The term **GMD** is defined in *6 U.S.C. § 101* as the following:

> a geomagnetic disturbance caused by a solar storm or another naturally occurring phenomenon

#### Citation:
  - *6 U.S.C. § 101*
  - Heading: **CHAPTER 1-HOMELAND SECURITY ORGANIZATION**

