rospy logging minimum configuration file

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I wanted to create a minimum logging configuration file for a rospy node according to http://wiki.ros.org/rospy/Overview/Lo... . Here is my file, for a node called explorer:

[loggers]
keys=explorer

[handlers]
keys=

[formatters]
keys=

[logger_explorer]
level=DEBUG

However, in my launch file, I launch another rospy node, which throws an error related to logging. Do I have to set a logger for each rospy node then in the [logger] section ? Isn't there a way to set the logging level for just one rospy node, letting other nodes use the default logging level?