spacer link to MAST page spacer logo image spacer

STScI's Internet connections will be UNAVAILABLE Saturday, 28 October 2017 from 7:00 AM - 1:00 PM. STScI web servers, SSH and similar services will be unreachable from the Internet.

Wide Field Coverage for Juno (WFCJ)

Tollefson et al., 2017, Icarus, 296, 163

Introduction

Description of Data Products

Data Access

Fig. 1: Multi-wavelength composite images of Jupiter give context for Juno observations. Microwave Radiometer footprints at the intrument's highest (green color) and lowest (blue color) frequencies are shown. LEFT: pseudo-true color appearance (contrast-enhanced), TOP-RIGHT: Near-UV ultraviolet, BOTTOM-RIGHT: Methane-band imaging (relative heights of hazes).
Fig. 2: Zonal winds for PJ3 in yellow, shown on a global map for comparison. White tick marks at the equator show where prograde (eastward) speeds are -50, 0, +50, +100, and +150 m/s.

Introduction

The Wide Field Coverage for Juno (WFCJ) program is synchronized with perijove passes of the NASA Juno mission. The Juno spacecraft orbit is very eccentric, allowing microwave and infrared scans of the atmosphere from a vantage point inside the planet's intense radiation belts. Although Juno is equipped with a visible wavelength public-outreach camera (JunoCam), the proximity to Jupiter during the perijove passes means that Juno itself cannot obtain regional-scale or global-scale imaging data to provide context for its own observations. The WFCJ program fills this gap with WFC3/UVIS imaging data. Some perijoves will be covered by a single orbit of HST imaging ("snapshot" coverage), while other perijoves will be covered by pairs of global maps ("global" coverage). Observing for two rotations allows the measurement of the speed of Jupiter's wind jets, which vary with latitude: the zonal wind profile (ZWP).

Juno's first perijove passes happened when Jupiter was too close to the Sun to be observed by Hubble. Perijove 3 (PJ3) was the first observable science pass, featuring global coverage.

Description of Data Products

The data are organized by sub-directory based on the perijove number they belong to. Each file name begins with the same prefix: "hlsp_wfcj_hst_wfc3-uvis_". The name of the planet is the next part of the filename. Each epoch is differentiated by a calendar year and a letter, e.g., "jupiter-2016pj03" is for perijove 3 during 2016. The next part of the filename includes the HST filter for that item, followed by a version number and the file type extension. Current file type extensions are:

  1. _zwp.txt = Zonal wind profile (ASCII text format).
  2. _zwp.fits = Zonal wind profile (FITS table format).
  3. _globalmap.fits = Mosaic (projection) for the given filter.
  4. _globalmap-medium.tif = Preview image (width x height ~ 900 x 450 px).
  5. _globalmap-small.tif = Preview image (width x height ~ 450 x 225 px).
  6. _globalmap.tif = Preview image.
  7. _nav.fits = Navigated image; FITS extensions give latitude, longitude, emission angle, and incidence angle for each pixel.
  8. _crz.tif = Cleaned image preview corresponding to *_nav.fits file; image has been corrected for some cosmic rays, fringing (if relevant), and geometric distortion.
Additional product types may be added as the mission continues.

Data Access

You can retrieve the images and previews from the table below, or directly at this URL.

Perijove Date (UT, YYY-MM-DD) WFCJ Imaging Zonal Winds
3 2016-12-11 Global (Load Table) ASCII   FITS
4 2017-02-02 Global (Load Table) ASCII   FITS
5 2017-03-27 Snapshot
6 2017-05-19 Snapshot
7 2017-07-11 Snapshot (Load Table)