Value of this inside defineProperty

Hey guys i have seen some code from mdn about Object.defineProperty().

The code is

function Archiver() {
    var temperature = null;
    var archive = [];

    Object.defineProperty(this, 'temperature', {
        get: function() {
            console.log('get!');
            return temperature;
        },
        set: function(value) {
            temperature = value;
            archive.push({
                val: temperature
            });
        }
    });

    this.getArchive = function() {
        return archive;
    };

}

I know inside the object of defineProperty() this refers to the function Archiver().

But i dont know what this points to inside the obj section Object.defineProperty(this, 'temperature', {

Does this also points to the function Archiver() ??

Any help would be appreciated..