| Name | OT1_nteanby_2 |
| Title | The chlorine cycle on Jupiter and Saturn |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342263702&instrument_name=HIFI&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-1wg5k3e |
| Author | European Space Agency |
| Description | Hydrogen halides provide key insights into giant planet atmospheres but their detection has so far remained elusive. Herschel/HIFI.s low noise and high spectral resolution provides a unique opportunity to detect these species for the first time - with an estimated sensitivity at the sub part per trillion level - an improvement of over three orders of magnitude on the best measurements currently available. Observing hydrogen halide species provides an exciting new avenue for studying chemical and dynamical processes at work on the giant planets. This proposal will focus on HCl - the halide with the highest predicted abundance and detectablity. HCl could have an internal or external origin - although models predict that an external origin from influx of extraplanetary material is the most likely. The observed HCl abundances will be used to: (1) Determine the magnitude of external Cl sources and compare exogenic flux environments and physiochemical processes between Jupiter and Saturn. (2) For Jupiter, by comparing the Cl flux to the O flux (from H2O), we can determine the excess Cl flux and measure the proportion of Io.s plasma torus that enters the top of the jovian atmosphere. This unique measurement would have implications for the whole Jupiter system. (3) Use the gradient of the vertical profile to determine the efficiency of HCl scavenging by NH3 in the stratosphere and constrain the stratospheric chlorine cycle. (4) Provide the most stringent test of interior thermochemical models to date, by determining limits on the abundance of HCl in the troposphere. This will help constrain the speed at which internal material is dredged up and the efficiency of HCl depletion by formation of ammonia salts. Comparing HCl abundances between Jupiter and Saturn will allow us to probe these processes under different internal and external environments, providing further insight. |
| Publication | |
| Instrument | HIFI_HifiPoint_dbs |
| Temporal Coverage | 2013-02-15T09:43:54Z/2013-03-07T21:36:39Z |
| Version | SPG v14.1.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2013-09-07T20:47:49Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2013, The Chlorine Cycle On Jupiter And Saturn, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-1wg5k3e |