| (a) Hot regions . | ||||
|---|---|---|---|---|
| Name . | Filling factor in interstellar space . | Typical dimension in interstellar space (pc) . | Number density of H+ ions (cm−3) . | Temperature (K) . |
| Coronal gas | ∼50% | 1000 | 10−3 | 106 |
| Warm ionized gas | ∼40% | 1000 | 0.3 | 8000 |
| HII regions | <1% | 1 | 102–104 | 8000 |
| Warm neutral gas | ∼10% | 100 | 0.3 | 8000 |
| (a) Hot regions . | ||||
|---|---|---|---|---|
| Name . | Filling factor in interstellar space . | Typical dimension in interstellar space (pc) . | Number density of H+ ions (cm−3) . | Temperature (K) . |
| Coronal gas | ∼50% | 1000 | 10−3 | 106 |
| Warm ionized gas | ∼40% | 1000 | 0.3 | 8000 |
| HII regions | <1% | 1 | 102–104 | 8000 |
| Warm neutral gas | ∼10% | 100 | 0.3 | 8000 |