Table 3.
The contribution (%) of [He] to the total model (MSISE-00 and IB-2008) neutral gas density at the reduction heights, hred, (see text) for the cases of coincidences between observations at Jicamarca site and CHAMP (or GRACE) observations. All neutral gas densities are given in 10−15 g cm−3 units. The cases of largest [He] contribution are given in bold. LT = UT-5.
| Date | Satellite | UT | h red, km | ρ MSISE00 | He (%) | ρ JB2008 | He (%) |
|---|---|---|---|---|---|---|---|
| Jun. 11, 2002 | CHAMP | 1617 | 410 | 3.92 | 2.6 | 4.32 | 0.6 |
| Aug. 13, 2002 | GRACE | 1744 | 500 | 1.78 | 3.5 | 0.96 | 1.0 |
| Jun. 26, 2003 | GRACE | 1611 | 490 | 0.60 | 4.7 | 0.63 | 1.6 |
| May 20, 2004 | GRACE | 1602 | 480 | 0.53 | 6.4 | 0.86 | 2.4 |
| Dec. 06, 2004 | CHAMP | 1720 | 370 | 5.64 | 1.6 | 5.78 | 0.5 |
| Dec. 08, 2004 | CHAMP | 1722 | 370 | 5.03 | 1.8 | 4.62 | 0.6 |
| Apr. 20, 2006 | CHAMP | 1845 | 370 | 3.41 | 3.0 | 4.24 | 0.9 |
| Sep. 20, 2006 | GRACE | 1722 | 470 | 0.32 | 7.4 | 0.31 | 6.9 |
| Sep. 12, 2007 | CHAMP | 1953 | 350 | 3.46 | 2.4 | 2.82 | 1.0 |
| Jul. 08, 2008 | CHAMP | 1530 | 330 | 2.62 | 1.9 | 2.52 | 0.3 |
| Jul. 09, 2008 | CHAMP | 1712 | 330 | 3.24 | 1.9 | 3.16 | 0.6 |
| Jul. 12, 2008 | CHAMP | 1600 | 330 | 3.47 | 1.7 | 4.06 | 0.5 |
| Jul. 13, 2008 | CHAMP | 1519 | 330 | 3.02 | 2.0 | 3.33 | 0.3 |
| Sep. 16, 2008 | GRACE | 1540 | 470 | 0.19 | 11.1 | 0.22 | 4.8 |
| Oct. 29, 2008 | GRACE | 1643 | 470 | 0.34 | 9.7 | 0.31 | 10.7 |
| Oct. 29, 2008 | CHAMP | 1754 | 330 | 7.45 | 1.6 | 6.32 | 0.8 |
| Mar. 24, 2009 | CHAMP | 1600 | 320 | 6.63 | 2.0 | 6.81 | 0.6 |
| Apr. 13, 2010 | CHAMP | 1748 | 290 | 17.1 | 1.2 | 17.3 | 0.6 |
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