Merged Interplanetary Data from L1

Quality-screened data from ACE, DSCOVR, WIND and SOLAR-1, merged at 1-minute cadence and propagated earthward by ballistic time-shift or a 1D BATSRUS MHD simulation. Combining every available L1 monitor gives near-continuous coverage no single spacecraft can match.

Plot & download data How it works

At a glance

Time range
1998 – present, updated monthly. Current release v0.9.6.
Cadence
1 minute
Variables
Bx By Bz (nT), Ux Uy Uz (km/s), ρ (cm−3), T (K), plus per-minute source and quality flags
Magnetic field
ACE, DSCOVR, WIND; SOLAR-1 from April 2026
Plasma
ACE, DSCOVR, WIND; IMAP and SOLAR-1 to be added when available
Propagation
Ballistic time-shift with shock handling, or 1D BATSRUS MHD, to any distance from Earth including lunar orbit
Output
CSV or SWMF text download and interactive plots for any date range, in GSM or GSE
Real-time
Preliminary tier from NOAA/SWPC's stream (SOLAR-1, ACE, IMAP), published in 5-minute batches; see the Real-Time page

Why MIDL

Any one spacecraft may have bad data points, which cause problems for solar wind – magnetosphere coupling studies and for models that take solar wind as input. MIDL merges measurements from every available L1 monitor with a consensus-based source selection algorithm and per-minute quality scoring.

  1. 1Multi-source consensus. When three or more satellites agree, the median is taken; when any two agree, their mean. Single-source fallback only engages when no agreement is possible.
  2. 2Physically consistent. Magnetic field and transverse velocity components are selected as coupled vectors, so each variable group always comes from a single instrument.
  3. 3Flexible propagation. Propagate to any distance from Earth, including the Moon's orbit, via ballistic time-shift with shock handling or a 1D BATSRUS MHD simulation along the Sun–Earth line.

Read the full algorithm description →