spase://CNES/NumericalData/CDPP-AMDA/ACE/SWEPAM/ace-swe-all

CDAWeb

ac_h0_swe

ThermalPlasma

Heliosphere

Heliosphere.NearEarth

The quality of ACE level 2 data is such that it is suitable for serious scientific study. However, to avoid confusion and misunderstanding, it is recommended that users consult with the appropriate ACE team members before publishing work derived from the data. The ACE team has worked hard to ensure that the level 2 data are free from errors, but the team cannot accept responsibility for erroneous data, or for misunderstandings about how the data may be used. This is especially true if the appropriate ACE team members are not consulted before publication. At the very least, preprints should be forwarded to the ACE team before publication. The SWEPAM observations, in particular the proton density and to lesser extent the temperature, became increasing sparse starting in 2010 as the primary channel electron multiplier (CEM) detectors have aged. Now, many years past the original planned mission lifetime, these Ulysses spare detectors do not provide adequate gain to make good measurements. In response, the ACE science team has developed and implemented, starting Oct 23 2012, an innovative mission operations concept that more frequently repoints the ACE spacecraft's spin axis further away from the Sun. This allows other, stronger CEMs that have received significantly less total fluence to measure the solar wind; this operational improvement has significantly increased the frequency of good quality SWEPAM observations, back to levels not seen in several years.