Jupiter Ionosphere/Magnetosphere
Online Mapping Tool

Welcome and thank you for your interest in our Jupiter Ionosphere/Magnetosphere Online Mapping Tool. This tool allows users to magnetically map a given point in Jupiter's ionosphere to the magnetosphere (and vice versa).

If this is your first time using the mapping tool, we recommend that you read the Frequently Asked Questions section at the bottom of this page.

September 2014 updates: There have been several recent updates to the online mapping tool. In July 2014 we added mapping results obtained with the flux equivalence calculation using VIP4 and VIPAL (see Vogt et al. [2015]). We have also recently corrected an error in the southern hemisphere mapping from Vogt et al. [2011]. Further details on these updates are provided in the FAQ below.

Comments, questions, and other correspondence can be sent to marissav@ucla.edu.

Mapping Form

Fields in bold are required.

Ionosphere to Magnetosphere
Magnetosphere to Ionosphere


For mapping magnetosphere to ionosphere:



For mapping ionosphere to magnetosphere:



Optional: Please provide contact information


I would like to receive e-mail updates about this online tool.
I would like the mapping results sent to me by e-mail.

Example Mapping - Subsolar Longitude 180


This figure shows mapping results for subsolar longitude 180, according to the model of Vogt et al. [2011]. The outer dashed black line indicates the mapping of 15 Jovian radii, or the orbit of Ganymede. The colored contours indicate the mapping of constant radial distance in the magnetosphere, every 10 Rj from 20 (black) to 150 (red). For reference, latitudes are labeled in blue and longitudes are labeled in black. There is an error in the southern hemisphere mapping in this figure and in other figures published in Vogt et al. [2011]. This error has been corrected in the online mapping tool.

Frequently Asked Questions (Updated July 2014)

How does the mapping model work?
The mapping is done using a magnetic flux equivalence calculation, in which we assume that the flux through a given area in the ionosphere must equal the flux through the region of the magnetosphere to which it maps. The model is described in detail in Vogt et al. [2011].

How does this mapping tool work?
The user provides a subsolar longitude and a position either in Jupiter's ionosphere or in Jupiter's magnetosphere. The form outputs the location to which the point maps in the magnetosphere or ionosphere according to the model of Vogt et al. [2011].

This tool does not perform the flux equivalence calculation in real time. Instead, it takes the user inputs and searches for the values in a pre-calculated table. When necessary, we interpolate the coordinates in the table to match the precise user input.

Why does the mapping tool give me multiple sets of results?
The Vogt et al. [2011] mapping model uses a flux equivalence calculation to map points between the magnetosphere and the ionosphere. It requires a model for Jupiter's internal magnetic field to calculate the flux through the ionosphere.
There are three widely used models for Jupiter's internal magnetic field:

We present mapping results from the flux equivalence calculation using all three models. (Note however, that the Grodent anomaly model is only valid in the northern hemisphere.)

How should I cite mappings from this website?
When using the mapping results in a presentation or publication, please cite:

If using mapping results with VIP4 in the northern hemisphere or VIPAL in either hemisphere, please cite our followup paper:

Can I map more than one point at a time?
Not at this time. If you're interested in mapping multiple points, please e-mail marissav@ucla.edu to obtain an IDL routine that performs this mapping.

What distances or local times can I map?
For mapping from the magnetosphere to the ionosphere, you can map all local times and radial distances from 15 to 150 Rj.

Help! I'm getting an error message! or Help! The results I'm getting don't make any physical sense!
Sorry about that :(
We recommend that you go back to the form and check that your inputs are in an appropriate format:
* Subsolar longitude should be in degrees (0-360)
* Magnetospheric radial distance should be in Jovian radii (15-150)
* Local time should be in hours (0.0 - 24.0)
* Ionospheric latitude should be in degrees (-90 to 90, with positive values for the northern hemisphere)
*Ionospheric longitude should be in degrees (0-360)
If that doesn't fix your problem, please e-mail marissav@ucla.edu with your inputs and error message.

What is the subsolar longitude?
The subsolar longitude is the longitude of local noon. It is similar to CML (Central Meridian Longitude), or the longitude in the Earth-Jupiter direction.

Why do I have to provide a subsolar longitude?
The flux equivalence calculation in our model includes the equatorial Bn, the component of the magnetic field normal to the current sheet, which is a function of local time. Therefore the mapping depends on how the ionospheric region of interest is oriented with respect to the Sun, or local noon. The effect of the orientation is familiar from images of the aurora at different CMLs (Central Meridian Longitudes).

What are the errors associated with this model?
We have not quantified the errors at this time. However, we expect that the error in radial distance will be small (~few Rj) and that the largest error will be in local time (up to ~1 hour). For more information, see Vogt et al. [2011].

I used this website 6 months ago to map a point to/from the southern ionosphere, but now I am getting a different answer. Why?
In August 2014 we discovered an error with the southern hemisphere mapping results published in Vogt et al. [2011]. We have corrected the error and the mapping tool provides corrected results. Further details on the error and the difference between the corrected and previously published results have been appended to Vogt et al. [2011].

What is that figure in the top right corner of the page?
This figure illustrates how we built the mapping model used in this tool. It shows how the flux through the ionosphere is linked to the flux through the magnetosphere. Modified from Figure 4 in Vogt et al. [2011].

Who runs this website?
This website was designed by and is maintained by Marissa Vogt. Comments, questions, and other correspondence can be sent to her at marissav@ucla.edu. Special thanks go out to Michael McGraw-Herdeg for design/UI advice, and to Bertrand Bonfond, Benjamin Palmaerts, and Andrew Steffl for testing this webform and the IDL mapping code.

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Last updated: March 2015
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