Research & Science Home ESA Public Web Site Sci-Tech Portal Herschel Public Web Site Herschel Sci-Tech Portal
Astrophysics Missions Planetary Exploration Missions Solar Terrestrial Science Missions Fundamental Physics Missions Science Faculty
Divisions
Herschel General Information
Herschel Science Centre Home
Latest News
Mission Overview
Science Instruments
Conferences/Workshops
News & Press Releases
e-News
Herschel Science Team
Herschel Users' Group
Herschel People
Useful links
Herschel Announcement of Opportunity (AO-2)
Introduction
'How-to' step-by-step
Documentation
Tools
AO Latest News
Herschel Observing
Overview
Calls for proposals
Scheduling
Observing status
Proprietary time
Observing Log
Key Programmes
AO-1 Programmes (GT1 + OT1)
AO-2 Programmes (GT2 + OT2)
"Must-Do" Programmes
Filler Programmes
Herschel Documentation
Observatory
HIFI
PACS
SPIRE
Herschel Data Products
Data Products Overview
Known Issues
Herschel Science Archive (HSA)
User Provided Data Products
Postcard Gallery - browse HSA
Herschel Data Processing
Data Processing Overview
HIPE Download
User Contributed Software
HIPE Community
HIPE Video Tutorials
Herschel Publications
Publishing Rules & Guidelines
Scientific Publications
Communicating Your Results
Herschel User Services
Services Overview
Helpdesk
Proposal Handling
Subscribe to Herschel eMail list
Herschel User Registration
User Registration
Lost Password ???

Herschel Science Archive (HSA) - Frequently Asked Questions


This page is a compilation of questions and answers to the most common problems that users have experienced when using the HSA.

Clicking on a question will take you down the page to the answer. If you want to find the answer to another question, either scroll through the page manually, or use your browser's 'Back' button to return to the list.


If you require further information, please contact the Herschel Helpdesk who will be happy to deal with your enquiry.




Q1. How can I open the HSA.jnlp file extension for launching the Java Web Start?
A1.
If you have Java already installed, for opening HSA.jnlp in your system you have to define which application will open it, depending on your operating system (for instance for Linux you can use javaws and for Mac you can use OpenJNLP). (see also: Launching an Application Using Java Web Start Software)

Q2. Sometimes the HSA gets frozen and is not possible to press any button or fill any text field in the Archive.
A2.
This is a problem of the Java Virtual Machine, follow these instructions:
  • Close all open sessions (File menu, option 'Quit') in your browser.
  • Check if a process called 'java_vm' exists executing in a terminal: [ ps -auxww|grep java_vm ]
  • If this is the case, then kill it executing in a terminal: [ kill -9 process_id ]
  • Re-start your browser.
Q3. How can I check the version of the Java Virtual Machine that I am currently using?
A3.
Sun provides useful tools to check the version of the Java Virtual Machine you are currently using and the details of the operating system in which you are running the HSA Archive.
If Java is not installed in your machine follow these instructions to get the latest stable version.
More detailed information and tools about Java versions/plug-ins can be found here.

Q4. Sometimes when HSA is upgraded I cannot get the new version and/or when my HSA User Interface is open since a long time ago, all the queries fail.
A4.
This two issues can be related to the Java Web Start Cache preventing you to refresh your HSA User Interface with the new version.
Please follow the instructions below on How to clean your Java Web Start cache:

  • On Windows
    1. Click on the "Start" icon in the lower left hand corner of your screen, followed by clicking on the "Run" menu choice.
    2. In the run box, type "javaws" (w/o the quotes) and hit "Enter"
    3. Select all the entries and then click on the "Remove Selected Application" button.

  • On Linux
    1. Find out what version of Java you're running by and typing in "java -version" at the command line (w/o the quotes).
    2. Type in the command "$JAVA_HOME/jre/javaws/javaws" on the command line.
    3. The application you need to clear your cache will then display itself as either...
    4. ..."Java Web Start Application Manager" if you're running java 1.4.something. Choose the "File", "Preferences" menu. You should see another window pop up titled "Java Web Start - Preferences". Choose the "Advanced" tab and click on the "Clear Folder" in the lower right hand corner of the window.
    5. or "...Java Application Cache Viewer" if you're using java 1.5. or higher. Select the "User" tab, select all the entries and then click on the "Remove..." button in the lower left hand corner.

  • On OS X
    1. Find out what version of Java you're running by running "Applications/Utilities/Terminal" and typing in "java -version" at the command line (w/o the quotes).
    2. If you're running java 1.5 or higher, then just type "javaws" at the prompt to start the Java Web Start cache manager.
    3. If you're running java 1.4.something, then you'll have to start the Java Web Start cache manager by looking in "Applications/Utilities/Java/Java Web Start"
    4. The application you need to clear your cache will then display itself as either...
    5. ..."Java Web Start Application Manager" if you're running java 1.4.something. Choose the "Java Web Start", "Preferences" menu. You should see another window pop up titled "Java Web Start - Preferences". Choose the "Advanced" tab and click on the "Clear Folder" in the lower right hand corner of the window.
    6. or ..."Java Application Cache Viewer" if you're using java 1.5 and higher. Select the "User" tab, select all the entries and then click on the "Remove" button in the lower left hand corner.
Q5. How can I enable Java in my web browser?
A5.
If Java applications are disabled in your web browser you will not be able tu use the HSA Archive.
To enable Java in your web browser follow these instructions.
Beware that the Java plugin on Unix/Linux platforms has to be linked to your web browser.
The Java library has to be placed or linked from the plugins folder under your browser folder
More detailed information and tools about Java versions/plug-ins can be found here.

Q6. Where can I find help on how to use the HSA browser.
A6.
There are two main sources of on-line help on the HSA:
  • The Herschel Data Analysis Guide
  • The on-line help in the HSA user interface. Clicking with the mouse on a little icon near text labels will pop-up a help window, whenever available. Also you can open the 'Help Contents' in Help Menu.
Q7. Is is possible to stop a query if I make a mistake?
A7.
The Query Specification panel contains the button Cancel just to the left of the Query button. Clicking this button will interrupt the ongoing query, and give back the full control of the HSA user interface.

Q8. Does the HSA contain information on future scheduled observations?
A8.
No. The HSA contains - by design - only information for those observations, for which at least part of the processing has been successfully performed. Users interested in Herschel mission planning are referred to the Observing Schedule.

Q9. I have forgotten the password of my HSA account. What can I do?
A9.
Open the Archive User Interface, go to 'Lost Password' in the Account Menu and follow the instructions

Q10. I have downloaded FITS files in a TAR archive from the HSA, but they are corrupted. How can I fix them?
A10.
You probably used WinZip, or some equivalent compression software, in Windows. WinZip has an option called TAR file smart CR/LF conversion, in the Miscellaneous tab of the Configuration dialogue window (at least for version 12.0), that is enabled by default and causes the corruption. Just disable the option to solve this problem. For more information, please see the Data Analysis Guide: Section 1.2.9, "Corrupted FITS file after unzipping"

Q11. I have downloaded FITS files in a TAR archive from the HSA, but when untaring it I get the message "lone zero block".
A11.
The untaring (depending on the command used to untar) could give a "lone zero block" message at the end. This message can be ignored. The tar is correctly untared and there are no problems with the FITS files.

Q12. When I retrieve a tar file with my MAC via ftp, the tar I got seems to be empty. In fact, the size of the tar is too small (1 few Kb) to contain any Herschel FITS file.
A12.
The standard Mac FTP browser does not work properly with the HSA ftp when you use the URL. It tries to mount it as a local disk but only put the reference and it does not invoke the real download. You should open a terminal (or use another ftp client) and connect directly to the ftp server.

Q13. The hui.jnlp application is not working from Firefox despite having the required java version installed.
A13.
By installing Java on a Linux system, the Java plugin for Firefox is not installed automatically. The corresponding library has to be manually linked to the .mozilla/plugins directory. See also Manual Installation and Registration of Java Plugin for Linux

Q14. I tried to open the HSA User Interface and failed. I was asked to download JVM which I already have.
A14.
If you're using Mac OS X 10.7 ("Lion") or Mac OS X 10.8 ("Mountain Lion"), you must have Java Runtime Environment (JRE) version 7 installed, to be able to start the HSA User Interface. If you don't have this version of the JRE, a warning with instructions will appear when you start the HSA User Interface. Please follow the instructions provided there.
Last updated: Tuesday, 19-Feb-2013 17:32:01 CET
Copyright 2000 - © European Space Agency. All rights reserved. Contact the HSC webmaster