Mission Overview

Wide Field Coverage for Juno (WFCJ)

 

Primary Investigator: Michael Wong

HLSP Authors: Michael Wong

Released: 29 June 2017

Updated: 27 June 2018

Primary Reference(s): Tollefson et al. (2017)

DOI: 10.17909/T94T1H

Citations: See ADS Statistics

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Multi-Wavelength Composite Images Of Jupiter
Multi-Wavelength Composite Images Of Jupiter

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).

Zonal Winds For PJ3
Zonal Winds For PJ3

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.

Overview

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.

Data Products

The data are organized by sub-directory based on the perijove number they belong to. Each file name follows the formula described below. Each epoch is differentiated by a calendar year and a letter, e.g., "jupiter-2016pj03" is for perijove 3 during 2016.

hlsp_wfcj_hst_wfc3-uvis_jupiter-<yyyy>pj<num>_<filter>_v1_<ext>

where:

  • <yyyy> is the year
  • <num> is the two-digit, zero-padded Perijove Number
  • <filter> is the HST filter(s) used
  • <ext> is the type of data product

A complete example file name is:

hlsp_wfcj_hst_wfc3-uvis_jupiter-2016-pj03a_fq727n_v1_globalmap.fits

Data file types:

_zwp.txt Zonal wind profile (ASCII text format).
_zwp.fits Zonal wind profile (FITS table format).
_globalmap.fits Mosaic (projection) for the given filter.
_globalmap-medium.tif Preview image (width x height ~ 900 x 450 px).
_globalmap-small.tif Preview image (width x height ~ 450 x 225 px).
_globalmap.tif Preview image.
_nav.fits Navigated image; FITS extensions give latitude, longitude, emission angle, and incidence angle for each pixel.
_crz.tif Cleaned image preview corresponding to *_nav.fits file; image has been corrected for some cosmic rays, fringing (if relevant), and geometric distortion.

Data Access

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)  
12 2018-04-01 Global (Load Table) ASCII   FITS

 

Citations

Please remember to cite the appropriate paper(s) below and the DOI if you use these data in a published work. 

Note: These HLSP data products are licensed for use under CC BY 4.0.

References